## [[2023-11-15]] - Stage tilt center adjustment - 0 - ![[Pasted image 20231115185702.jpg|292]] - 25 - ![[Pasted image 20231115185926.jpg|med]] - 50 - ![[Pasted image 20231115190021.jpg|med]] - Found the horizontal goniometer adjustment screw to be backed out several turns, not even engaged with the stage (Screw 350 diagram 808A) ## [[2023-10-25]] Goal: Leave the microscope ready to use - Started conditioning at 20kV, ramped to 63kV at .33 kV step size - [[Beam shower]] at 60kV - saturated filament, HV wobble with ROT CENTER. - Can only go to spot 5 because sample rod is out - [ ] NOTE: at some point we should shut the system down and check all of the grounding - Stepped up to 80kV (83, then down to 80), beam shower again - Ramping up again to 103 kV with step size .05 kV - First pressure spike happened at 94.2 kV, IGP pressure went to 21 - spiked a teeny bit to IGP = 20 at 98.9 kV - again, tiny spike at 100 kV, 101.25 kV, 102.45 kV - Filament was on the whole time for that ramp - Beam shower at 100 kV - Big pressure spikes at 111.75 kV - up to 51 and then 44 - then quickly back down to 20 - Went up to 113 kV, then beam shower at 110 kV - small spike to 25 at 122 kV - Went up to 123 kV, then beam shower at 120 kV - small spike to 25 at 126.05 kV - small spike to 23 at 127.85 kV - spike to 36, then 46 at 130.10 kV ## [[2023-10-18]] ![[Pasted image 20231018202836.jpg|grid]]![[Pasted image 20231018202922.jpg|grid]]![[Pasted image 20231018203019.jpg|grid]] SF6 refill process log... - Ball valve on tool is closed, pumping to ultimate pressure (.105 Torr) - Opened ball valve to pump down accelerator - Purged N2 tank for 5s - Closed ball valve - Pressurized to 5psi N2 - New base pressure - .088 Torr - Closed N2 tank - Opened ball valve - New base pressure - .411 Torr - Tightened some fittings to try to lower base pressure - New base pressure - .311 Torr - Closed ball valve - Re-did hose barb connection to SF6 tank - New base pressure - .066 Torr - Opened ball valve - .115 Torr - Closed ball valve - 5 psi N2 pressurization (opened regulator, closed regulator) - Opened ball valve - Back at .115 Torr in 10s - Pressure holding at .110 Torr - Ball valve closed - 5 psi N2 pressurization - Ball valve opened - Pressure at .111 Torr in 10s - Ball valve closed - Base pressure - .055 Torr - Fucked with the fittings again - Opened the ball valve - Pressure .155 after 10s - Pressure down to .114 and falling - 5 psi N2 pressurization - Ball valve closed - Pressure .051 - Ball valve opened - Pressure at .115 after 10s (still falling) - Waited for pressure to drop between .1 Torr (.099 Torr) - Purged SF6 tank - Tank valve cracked open and closed - Regulator currently set to ~10 psi - Output ball valve closed - Opening output valve to evacuate the small volume of SF6 that is trapped in the regulator - Pressure at .088 Torr - Opened manual valve that connects line to emission chamber - Waited for accelerator to pump down - Reconnected V19, so we are evacuating the inner chamber as well - Pressure at .115 Torr and holding steady - Closed ball valve - Filled with nitrogen to 7.5 psi - Pressure at .045 Torr - Opened ball valve - Pressure at .105 Torr and holding - Closed ball valve - Pressurized with N2 to 7.5 psi - Gauge on accelerator says 1 bar - Closed N2 - Opened ball valve - Pressure at .100 Torr and holding - Closed ball valve - Pressure at .037 Torr - N2 valve open - Pressurized to 6 bar with N2 to test the system before SF6 - 90 psi on pressure gauges on the tube - 6.5 bar on microscope pressure gauge - Closed N2 valve - Opened ball valve **slowly** - Pressure at .097 Torr - Ball valve closed - SF6 main valve open - Tank pressure is reading ~180 psi - Set regulator to 80 psi - Opened SF6!! - Pressure on microscope gauge at 6.0 bar - Pressure on SF6 tank at 81 psi - Closed SF6 main valve - Closed SF6 isolation valve - Closed manual valve on microscope accelerator - Valves are all closed - Kept line pressurized in case we need to add more ## [[2023-10-11]] - Left the scope pumping on the diffusion pump for a week with the IGP off - The professor turned the IGP on a few times. Reported that it would stay around the 30s the spike up 8 points before returning the baseline - Connected an oscilloscope to the IGP test point on the HVG card - Turned on IGP - Started at 60, dropped to 30 within a few seconds - First blip was from adjusting vertical position on the oscilloscope, not the IGP - ![[Pasted image 20231011151040.jpg|sm]] - Now down to 25 - Now down to 21, have not seen any spikes - ![[Pasted image 20231011152903.jpg|sm]] - ![[Pasted image 20231011154853.jpg|sm]] - The professor reported that the KF clamps on the IGP were lose, he tightened them. - Plugged gun defectors back in - Plugged in S34, which is the gun lift switch and responsible for turning on and off the optics. - As seen on the lens current page the optics are now on. - Bringing up HV for the first time - We would like to do a bit of testing of the HV system before filling with SF6 - But the KV we can get to without 6 bar of SF6 present will be somewhat limited - We estimate that we could sustain about 5kv between the safety gaps - This would in theory lets us get up to about 20-25k, but we can only start the kV at 20kv so that doesn't give us much margin to see whats going on - Based on this we are going to get the gun under SF6 before bringing it up. - To install the SF6 and vacuum plumbing we need to put the microscope into standby or fully shut it down. We will be going into standby. - ![[Pasted image 20231011164209.jpg|sm]] - Vac status before going into standby - Put microscope into standby, the reading on the osiliscope went to zero but the IGP is still on. ### Standby List - [ ] Install fittings for vacuum manifold - [ ] maybe add some epoxy - [ ] Connect grounds ### Complete shutdown list - [ ] Check 24VDC fan ## [[2023-10-05]] - Measuring IGP pressure at test point X8 on HVG with oscilloscope - Configured oscilloscope for rolling acquisition, 100s per division - Starting vacuum state before plugging in X8 - ![[Pasted image 20231005174224.jpg|med]] - P1: 34 - P2: 59 - P3: 49 - IGP: Off - Plugged in X8 - Nothing happened? - Unplugged and plugged again, still nothing - Whats happening? - V4 is not open - P3 is bellow where we have seen it cause V4 to open before - The IGP interlock plug is plugged in but the IGP is not even trying to turn on - This is our first time trying to turn on the IGP after the filament exchange - What can we do to learn more? - Measure voltages on the IGP interlock circuit - Try changing the state of the vac system slightly (IE removing the sample rod) - Map out the IGP enable circuit and see if that is informative - Make more observations - Pressed vac on to see how the system responds - Turned on PVP and roughed down buffer tank to 30 - Removed the sample rod - The LED on the +24V supply was out, I touched the led and it turned on - The fan in the 24V power is not spinning, will have to look into this more. The fan could be thermally controlled. - Running through the IGP interlock circuit - 23. - VDB X79: 23.05V - So at a minimum most of interlock is ok - Going to try slightly changing the state of the vac system, then maybe a reset of the entire scope - Applying gun vent for a second the releasing, with the vent valve unplugged - All column valves closed - Opened buffer tank untill P1 30 - Opened V18 - Opened V10 then went though the rest of the column pump - It opened V4 - TURNED ON THE IGP - IGP at 41 and dropping - IGP pressure climbling, now at 71 - Going to do a few things to isolate potential leaks - Closing V5, V7, and V4 - Pressure kept on climbing - Re-opened all valves (double checked) - The ion pump is quite warm - The going theory we have is that the ion pump has adsorbed a lot of gas and as the pump operates it heats up and starts to out gas. As the pressure increases it starts to heat the pump more, leading to more gas and more heat... - So the question then is how to break the cycle. We talked about: - Letting the ion pump run until it gets hot then open it back up to the DP - This is more or less what we have been doing, just not intentionally - Trying to apply external heat to the ion pump while being pumped by the DP - Chilling in the cold finger to help pull more gas out of the ion pump ## [[2023-10-04]] - Restarting the microscope - Plugged in the cable for the HV Cable present in gun switch and SF6 valves - The switch does not interlock the vacuum system, but the connector has one of the vac 24V interlock lines running through it if memory serves. - Buffer tank pressure was 15 torr before we turned the system on - ![[Pasted image 20231004154416.jpg|sm]] - When we turned the scope on we only got this white screen, not the expected RAM test screen - It did not respond to the reset button - ![[Pasted image 20231004154455.jpg|sm]] - With the scope off, we reseated and wiggled the 3 cards in the microscope that use card edge connectors (the main computer boards) - Turned the scope on and got the expected RAM test screen - ![[Pasted image 20231004154656.jpg|sm]] - Compustage initialized without errors - Went to vac screen to check pressure before turning the vac system on - ![[Pasted image 20231004154809.jpg|sm]] - P1: 66 - P2: 99 - P3: 79 - P4: 0 - Came back from lunch to vacuum in a good state - ![[Pasted image 20231004164448.jpg|med]] - P1: 35 - P2: 60 - P3: 55 - P4: 0 - Plugged in X8 to turn on the IGP - IGP read 32 on screen - P3 did not change - There was a buzzing or hissing noise coming from the IGP area - Unsure exactly what the noise was - Going to work to verify that they IGP is actually at vacuum - What could cause the sounds we heard? - Pneumatics hissing - Pneumatic Coil buzzing - Discharge in the IGP - Verifying where valves actually are - Need to be careful here as we are still connected to the diffusion pump - V5: - The yellow tell tale is not out - ![[Pasted image 20231004165456.jpg|lg]] - Checked valve status on vac board. LED for Y5.1 is lit. LED for Y5.0 is not lit - NC and Common are currently connected together, indicating that the valve is closed - On the back of Solenoid Y5.1: 22.6V - V7 - The V7 microswitch is depressed, this indicates that the V7 is open - Its possible something is wrong with the switch of course, we will test the valve once safe to do so (IE not with it pumping on the diffusion pump) - How to safely test these valves: - We need the DP valve V3 to be close - To close the DP valves we can put the system into camera air - Could also try to manually close V3 or V6, but it seems easier and safer to let the automation do it - Also I think V3 is interlocked so it closing might put the microscope into an undesierable state - We could unplug V6 and V4, those do not have microswitches on them - Put the system into camera air - V7 and V5 closed, which is what we want to test... - Because we want power to V7 and V5, we can not put the system into camera air - So we are unplugging V4 and V6 to isolate from the diffusion pump - Tried to unplug V4 and V6, but did not hear anything... - It seems like whatever is happening with V5 and V7 is also affecting V6 and V4 - It looks like the wires going to the valves are plugged into the wrong 2 pins, possibly - There are 3 pins on the back of the solenoids - BUT there are no indications as to what pins the 2 wires are supposed to be plugged in - ![[Pasted image 20231004174948.jpg|sm]] - Testing which of the 3 pins are the right ones to connect to - Y6, Y4, Y7, and Y5 are wired with top and right pin - Y20.0 and Y20.1 are wired with top and bottom pin - Y20.0 is warm, all the other valves are closed - Tested the continuity between all 3 pins. No continuity between the pin on the side and the top and bottom pins - 220 ohms between the top and bottom pin - Put the scope into camera air - Moved all of the connectors to the top and bottom and pin - ![[Pasted image 20231004175021.jpg|lg]] - - Took the scope out of camera air - Could hear all of the valves moving when the system pumped down this time - Sooooooooooo it was the connectors on the valves in the wrong spots - V5 open - ![[Pasted image 20231004174806.jpg|med]] - V6 open - ![[Pasted image 20231004175255.jpg|med]] - Let the system pump down to P3 56 - Plugged in X8 to to turn on IGP - IGP pressure stayed high - Unplugged X8 to turn IGP off and waited awhile - Plugged in X8, IGP pressure started at 81 and kept dropping - Igp pressure reached 61 - Sometime after the low we observed IGP pressure climbed up to 99??? - It did not open V6 - Unplugged X8 will debug more later - Put a new filament in - Set filament spacing 3/4 turn - Pumped scope down and left with X8 unplugged - ## [[2023-09-27]] - Installed the O-ring we forgot last time ![[IMG_4427.jpg|lg]] - Noticed that the gun grounding flap is deformed and gets in the way of closing the gun - Decided we needed to fix it so that it is impossible for the metal flap to get caught on the wrong side of the gun during filament exchange. ![[IMG_4437.jpeg|lg]]![[IMG_4439 copy.jpg|lg]] ![[IMG_4450.jpg|lg]] ## [[2023-09-20]] - Completed the rebuild of the mantle as described in [[PSU CM200 High Voltage Repair Log]] - Reassembly - Attach the mantle to the base - The involves accessing the bolts that are by the gun deflector coils, so the entire assembly will have to be tilted to the side or hung off the edge of a desk - Install the hardware on the top of the mantle - This is the metal receptacle for the whenalt and the plastic insulating tube - Install the lead shielded housing over the entire assembly - Install the electron gun insulator assembly, we can put the whenalt in now or do it later - Lift the entire assembly onto the microscope with the crane ## [[2023-06-07]] ### Checklist Before Back in Service - [x] Unplug vent line - [x] Enable microscope level - [x] Re-attach HV Ground - [x] Plug in VDB X16 - [x] Gun Deflector DCB1 and DCB2 - [x] S34 Gun Lift Switch - Removed to turn optics off, ==make sure stays disconnected until the Gun Derflectors are plugged back in== - [x] Little shielding plate next to gun deflector cable - [x] WHEN CONNECTING HV CABLE FOR FIRST TIME, loosen the 4 bolts that holds the flange that the HV cable connects to, install cable, then tighten again. ### Notes - After we left, the HV was turned on - BUT the valves we isolated for leak checking were not de-isolated - This meant that the HV turned on while nothing was pumping down the gun chamber - It was reported to us that the emission gauge was going up and down full scale at about 1 Hz, when trying to go up to imaging kV (40-80) - At 20 kV, the meter goes all the way to max and stays there for longer, and then goes back down to 0, at about .2 Hz - Plan is to start with a basic gun lift and inspect the Wehnelt - Reattaching the vent line - Inspected inside the emission chamber - ![[Pasted image 20230607164456.jpg|grid]]![[Pasted image 20230607164553.jpg|grid]]![[Pasted image 20230607164612.jpg|grid]]![[Pasted image 20230607164651.jpg|grid]]![[Pasted image 20230607164705.jpg|grid]]![[Pasted image 20230607164722.jpg|grid]] - Observations - Noticed some specks and flakes - any one of those alone could cause instability - Also noticed some discoloration, don't know if it was there before or not - Pulled the Wehnelt out - accidentally broke the filament :( - Plan: Inspect the outside of the accelerator stack - Observations - ![[Pasted image 20230607172816.jpg|grid]]![[Pasted image 20230607172855.jpg|grid]] - Ceramic is cracked, there's scattered ceramic dust - ![[Pasted image 20230607174005.jpg|grid]]![[Pasted image 20230607174025.jpg|grid]]![[Pasted image 20230607174048.jpg|grid]]![[Pasted image 20230607174123.jpg|grid]] - Need more access to the accelerator stack - what to do next? - Plan: - Clean ceramic off the o ring - Lower and reattach lifted section (just a few bolts for stabili) (just a few bolts for stability) - Remove the gun cable - Mount the crane - Found eye bolt attachment for the top of the column - Going to separate the column with the service lift, swing it out, and *then* lift it with the crane Lift the gun section again with the crane ## IGP pressure high -PSU CM200 Bringup [[2023-05-24]] - Came in and pressure on the IGP was up at 23 - The sample rod is currently in and ha been since we left last week - External gauge: 107 mTORR - Before cycling buffer tank - ![[Pasted image 20230524162649.jpg|sm]] - After cycling buffer tank - ![[Pasted image 20230524161735.jpg|sm]] - We closed V4, V5 and V7 via unplugging the solenoid valves that drive them at 4:20PM - Going to head over to the arts building to scout out spaces for teardown 2023, will see what pressure looks like when we get back. - Back at 5:24, no change in IGP pressure - So, why is the IGP at 23 instead of the baseline of 16 have been consitantly seeing? - There could be a vacuum leak - The IGP could be contaminated - There could be a virtual leak - The IGP could have formed a whisker - The IGP could be reading incorectly - The measuring circuit could be working incorectly - The IGP value could not be updating - Just want start with cycling the IGP - Going to Unplug V6 to keep the DP from connecting to the gun - Going to unplug the IGP Interlock that is on the pump - Connector X-8 - This will shut the IGP off, and normally the microscope would then attempt to pump the column using the DP, but because we have all of the valves that could connect the column to the DP unplugged, this can not happen. - Unplugged X8, waiting ~1minute before plugging it back in - Plugged X8 back in, came on at 26 and pretty quickly returned to 23. - Hit the IGP with medium hard force, pressure quickly became unstable and went up to 48 for a briefe moment - It really went all over the place. Multipe times it spiked up to 48 all on its own for a bout a minute after hitting it. - Backgrond: - The IGP trip levels are: - 4.67 VDC - 7.425 VDC - Presumably these are IGP ok and IGP shut off, respectively - See [[CM Vacuum Pressure Unit Conversions]] - Testing IGP pressure with an osiliscope while hitting the pump - Isa hitting the IGP once on the front - ![[Pasted image 20230524181253.jpg|lg]] - Isa hitting the IGP multiple times on the back, the last spike happned all on its own - ![[Pasted image 20230524181324.jpg|lg]] - Isa hitting it more. Several of the spikes were not coralated with hits to the pump - ![[Pasted image 20230524181516.jpg|lg]] - Now its Adams turn - ![[Pasted image 20230524181659.jpg|lg]] - Just hit it once, all of the other spikes happended on its own - ![[CleanShot 2023-05-24 at [email protected]|lg]] - A few minutes after hitting the pressure is sitting at 25 on screen, 3.96 volts on this osiliscope - Starting pressure was 23 and 3.72 on the osiliscope - Adam hitting it repeatdly for a few seconds then just observing - ![[Pasted image 20230524182427.jpg|lg]] - Isa hitting it some more, the last 2 spikes were not coralated with hits - ![[CleanShot 2023-05-24 at [email protected]|lg]] - The baseline is even higher now - 4.08V - 27 on screen - Several minutes later the pressure baseline is stil elevated and the previous levels, and sometimes drifts even higher than those levels. - Contenuisly hitting it more - ![[Pasted image 20230524183508.jpg|lg]] - ![[Pasted image 20230524183944.jpg|lg]] - ![[Pasted image 20230524183956.jpg|lg]] - Found that one of the magnets was not quite in postion - ![[Pasted image 20230524184420.jpg|lg]] - Putting it back in postion did not change pressure - ![[Pasted image 20230524184624.jpg|lg]] - Pressure spiked all on its own sometime later - ![[Pasted image 20230524184734.jpg|lg]] - Just moving the sample rod out and a little bit resulte in the pressure dropping then increasing - ![[Pasted image 20230524185126.jpg|lg]] - ![[Pasted image 20230524185349.jpg|lg]] - Pulling the rod out and closing the door, but leaving it in the goiniometer - Pressure droped to 20 on screen - ![[Pasted image 20230524185618.jpg|lg]] - Removing the rod, then reinserting and pre-evacuating it - With the rod all the way, pressure drifted upwards slightly - ![[Pasted image 20230524185817.jpg|lg]] - After several minutes pressure was up at 22 - Put the rod in and pre evaced it. Pressure dropped to 19, the lowest we have seen al day - ![[Pasted image 20230524190050.jpg|lg]] - So it seems like we have a bit of leak with the sample rod, and a different leak when the sample rod was out - When we put the sample rod in, there was a drop. This is usally a symptom of a fiber on the door leak - When the sample rod was in, moving it in and out result in pressure improving somewhat, inidcating a potential leak on the sample rod oring - Pulled the rod, left it out for a bit, then re-inserted it - Pressure went up when I removed it, then back down as soon as I pre-evaced it - Pressure now down to 17 - ![[Pasted image 20230524191141.jpg|lg]] - Pulled the rod in and out again, now pressure is donw at 16 - If we want to do diagnstics for a V8 valve leak, we would want the rod all the way in so that the V8 valve seat is connected to the column through the gonimeter door - With the rod only partially seated, V8 is somewhat isolated from the column via the goinimeter door - If the door is leaking, a leak in P8 would eventually make it to the chamber, but this would be much sloer than if the ball were open. - Cleaning the sample rod o-ring - ![[Pasted image 20230524195248.jpg]] - Reinstalled the rod. Because the rod is wet after being exposed to air it will take some time for the base pressure in the vacuum system to get to its (hopefuly) new baseline. - So what is left to do the resolve the vacuum leaks? (as far as we can tell right now) - Removing the gonimomter to inspect for/clean off fibers on the goniometer door - Pressure on the IGP got down to 16! Lookes like cleaning the sample rod o-ring (unserprisnly) resolved that leak. - ![[Pasted image 20230524200002.jpg|lg]] - Pressuren now at 13! ## [[2023-05-17]] Starting pressures: - P1: 34 - P2: 59 - P3: 46 - IGP: 20 - External gauge: 170 mTorr 3rd down on the left softkey is a bit mushy and doesn't work consistently - this is the key you use to coarse set HV so it's problematic. 4th down is a little mushy too but not as much of an issue. - Ran into a kinda non-obvous way the stigmator controls can feel weird when the sample rod is not installed: - With the sample rod out, the spot size is limited to 5 - But the way the spot sizes is limited is a bit strange, it will always read a spot size smaller than spot 5, but the actual spot size number still exists somewhere, and the spot size knob will let you kinda select spot sizes 1-4 still - The way this shows up is you can turn the knob 4 clicks past spot 5 before it beeps, indicating that even though the spot sizes is limited to 5 without the sample rod, there is still a variable somewhere that can can be set to 1-4 - P1: 35, External gauge 196 mTorr ### Stage Troubleshooting - Initialized CompuStage - Encoder Error X, didn't complete full tilt rotation - Initialized again - Completed tilt initialization, then Tracking Error X - Inserted X limit set screw farther out - Encoder Error X, tilted at about +70° - X axis is not currently touching the limit screw - Initialized again - Seemed like it fully initialized, paused for a while, but it wasn't done and kept moving more - No GNCB Communication Error - Initialized again - Move simultaneously in X and Y - Not making contact with X set screw - Tracking Error X - Initialized again - Paused - No GNCB Communication - Initialized again - Tracking error X when it started to try to move the X motor for the first time - Initialized again - Tracking error X when it started to try to move the X motor for the first time - Initialized again - Tracking error X at the same point in the sequence - Initialized again - Tracking error X at the same point in the sequence - took some videos, initialized a few more times... - Initialized again - Tracking error ==A== !! -![[Pasted image 20230517163036.jpg|med]] - Put into standby and then back on - Initialized again - Tracking Error A - Noticed that tilt motor was running into solenoid valve - tilt motor so loose that resting against the solenoid was the only thing keeping it engaged - Worm drive was also quite loose. Very loose. - Reattached it securely - ![[Pasted image 20230517170443.jpg|grid]]![[Pasted image 20230517170508.jpg|grid]]![[Pasted image 20230517170528.jpg|grid]]![[Pasted image 20230517170548.jpg|grid]] - Initialized again - Moved in every axis except X and stopped - Moved in Y again - No GNCB Communication Error - Found partially unseated cable on MBG - ![[Pasted image 20230517170357.jpg|med]] - Went into standby and back - Initialized again - Tracking Error X - Initialized again - Tracking Error X - Initialized again - Tracking Error X - Initialized again - Tracking Error X - Initialized again - Held the cable bundle up and out of the way - Tracking Error X - Initialized again - Tracking Error X - Manually moved X axis away from the end stop - Initialized again - X axis moved back to the same position - Tracking Error X - Manually reset X and initialized again - Tracking Error X - Retracted X set screw - Tracking Error X - Assumption: Tracking Error X occurs during calibration when an end stop is hit before the EPD is reached. End stop detection is done through the pole hit protection circuit - Why would the stage be hitting an end stop if I can't see the set screw or any other part of the X axis making contact? - Something else is shorting the 2V pole hit detection potential - Could be dirt or an electrical problem - Could be part of a different axis hitting an end stop while X is actuating - Could be an internal part of the X axis mechanism hitting another part of the stage - Initialized again, watching the pole hit LED this time - Flashed briefly during Y initialization, and again before X tracking error - Initialized again and took a video of LED sequence - Pole hit LED flashing during Y initialization makes sense, it's supposed to go to the mechanical end stop then. - Explored what is and is not grounded, and noticed that on the x axis the set screw is at the same +2v potential as the actuator lever - Found that the tensioning screw on the x axis drive was lose, we loosened it to test the travel range a week or two ago - Tightened x tensioning screw on turn (there is a mark on the screw and body of drive assembly) - Reinitialized stage, got X tracking error, but only after the x axis moved much more than it had before. - I think it moved until it got to the point where it had expected to see the hard stop but did not - Extended set screw into the actuator lever until I saw the actuator lever deflect slightly - Stage initialized correctly! - Stage initialized correctly again! - Adjusted set screw a bit further in - Tracking error X, but this time it pulled the drive shaft all the way off of actuator lever, leaving the actuator level resting on the set screw. It took quite some time with the motor just stalled for it to stop and error out. - Tracking error x again, it did not drive the shaft away from the end stop. - X NEOS is active - Ok thinking that the set screw is to far out, so the encoder stops reading before NEOS is active, or maybe at the same time. - If this is what is going on, this is very similar to what was going wrong with the Y axis. - With the drive shaft full retraced against the X NEOS sensor, retracted the set screw until the lever was resting on the x drive shaft, then inserted the setscrew until the x axis lever just barely deflected. - Stage initialized correctly! - Stage initialized correctly! - Stage initialized correctly a few more times - Re-secured the cable going to compustage - Tried to insert a holder, but the vac system was not on because of a reset we did earlier - Re-initialized the stage, and got a tracking error A - We think this could be because of the cable we reattached limiting movement - Re-initializing the stage is just resulting in it running into the rotation end limit immediatly, it will not back off - To recover from this, I am losing the A motor mount, and manually tiling the stage back ### Goniometer Door Leak - With the holder out the IGP pressure was 20 - After the holder was pre-pumped out, pressure went down to 16 very quickyl - Pulled the holder back out, and pressure went up ## [[2023-05-11]] Continuing with the backing pressure issue - Setting up to probe the PVG board - We want to put the PVG board on a rise card to be able to probe it - But we do not want to have the interlock trip and shut the IGP down when we pull the board out - The interlock does not run through the PVG card, so pulling it out did not take the scope out of standby - Found some damage on the board - Capacitor was leaning up agains R27, one of the reference resistors for the P1 setpoint. Its possible that it actually wore through the case P1 pins 3 and 5 (in vacuum): 42 Ohms P1 pins 4 and 1 (in air): 26 Ohms X9 to X12: -12.005 X9 to “output of D21”: 11.897 Across R27: 1.218 (should be 0.8) Across R26 and R27: 2.0133 (should be 2) Across R25 and R26 and R27: 2.2204 (should be 2.2) Across R8: 1.1929 (should be 1.2) Across R8 and R7: 1.7507 (should be 1.75) Across R8 and R7 and R6: 2.3078 (should be 2.3) - What comparator does what? - The buffer tank has 3 applicable trip levels - The buffer tank has been pumped down low enough - The buffer tank needs to be pumped out - The buffer tank pressure is so high that the vacuum system needs to go into an emergency shut down - So, the 1.6V comparator is buffer tank low enough - The 2.0V comparator is buffer tank needs to be pumped out - The 2.2V comparator is critical backing pressure - Getting setup to measure where the setpoint trips - Going to measure the analog output of the gauge and the logic coming out of the setpoint - To do this, will put an oscilloscope on X14 (analog pressure P1) and on D9 pin 4 - Testing leak up transition voltage - ![[Pasted image 20230511181405.jpg|lg]] - Yellow = Analog Pressure - Blue = Comparator Output - Can see that the comparator output transitioned to high when the voltage was just a little bit past 2 volts, maybe 2.1 or 2.15 - We were expecting it to transition at 2V, so this is close - BUT the difference between the "Time to pump down" signal and the "time to go into emergncy" is only .2V. - X9 to X14: 7.198 V - X9 to X15: 6.977 - X8(-) to X13(+): .004 V - X7(-) to X11(+): -.0026V Adjusted R3 until X9 to X15 (P1) is 7.820V Adjusted R4 until X9 to X14 (P2) is 7.800V - Offsetting it in this direction is good, this will decrease the pressure it crosses the setpoint - Connected a convectron gauge in parallel with the system vacuum guage ==Noticed a fan in the power supply rack making excesive noise ## [[2023-05-10]] Backing pressure issue has gotten worse Upon arrival: - IGP: 29 - P3: 85 - P1: 38 After hitting Vac On: - IGP: 23 and falling - P3: 53 - P1: 31 [[CM PVG Setpoints]] - Observations - Pressure in the camera chamber seems to be reising concernly high - We found the IGP to be reading over 10 units higher than baseline as a result of the increased camera chamber pressure - Pumping down the camera chamber resulted in pressure in the column decreasing - We have observed the pressure to be as high as 38 on the display, which is not abnormal - What we think is going on - The system is seemingly not pumping down the buffer tank when it should - By when it should we mean that when pressure in the buffer tank is high - What we don't know - It seems like the is a new problem that has been getting worse - We dont have long term data logging though, so can not say this for certian - If this was an issue we missied, or if this has developed recently - If this is something that has developed recently, why the change? - What could cause what is going on? - The output of the guage could be wrong - Contamination - One of the two filaments in the guage could be wearing out - The filament could be damaged - The output of the guage could be being interpreted incorectly - The signal from the guage could not be making it to the PVG (Pre Vacuum Guage) board - There could be a problem in the Whestone Bridge - This could or could not be the tunning of the bridge - There could be a problem with the amplifier on the whestone bridge - There coould be a problem with one of the There could be a problem with the buffer tank pressure high comparator - This could be a problem with the comparator itself, or the refference voltage the comparator is comparing the pressure against - The digital signal from the comparator could be correct, but is for some reason not making it or not being interpreted correctly by the vacuum controller ![[PSU CM200 Bringup Log 2023-05-10 16.46.21.jpg]] %%[[PSU CM200 Bringup Log 2023-05-10 16.46.21.excalidraw|🖋 Edit in Excalidraw]], and the [[PSU CM200 Bringup Log 2023-05-10 16.46.21.dark.jpg|dark exported image]]%% - Is the guage outputting correctly? - Checking the resistance of the guage filaments - There is the filament in Air and Vacuume - Vac Filament: 27Ω - Air Filament: 42Ω - ## [[2023-05-03]] - Came in and chilled in the cold finger - More compustage diagnostics - Still getting a few anoying things: - Tilt center is not in the center of the screen - Sometimes during stage movement, the joystick will disable and the stage will move 200 um horizontally or so. - Sometimes when it does the stop and un-commanded move it also changes Z height - Found loose screw on the side of compustage. These screws are what attach the stage to the micrscope. Will see if sucuring these moves the stage at all, this could possibly improbve alignment - Tigtening these only caused about 10µm of image shift, which is very minimal all things considered - Compustage alignment plan - First we want to center the X axis, as that is causing initilation problems, and while trying to navigate the grid you can end up hitting the end limit - From there we want to do the mechanical adjustments to the eucentric height and position - Will have to figure out if it is better to do height first or to center the mechanism first - Adjusting X Position - Using 1.3mm hex to losen set screw, and 1.5mm hex to adjust the end stop grub screw - Estimating how many turns to adjust the grub screw: - [[CompuStage Limit Adjustment]] - The grub screw use a 1.5 mm hex, from this we can guess that it is a M3x.5, so a .5mm thread pitch. - it looks like I am between .4 and 1mm off of center, So will start with 1 turn to move the grub screw in .5mm - Just realizing that this grub screw is adjusting the endstop on a lever, so it might not be 1:1 screw length to end stop, but will still start with a 1 turn move. - After one turn on the grub screw, we re-enable to stage to get it to re-home - Note how far away the plate is from the hal sensor - ![[Pasted image 20230503170920.jpg|lg]] - Got a tracking error x as a result of hitting the end stop before the hall sensor (the hall sensor is known as the near end of stroke detector) - Tracking error can happen when you hit the physical limit unexpectedly - Will back off one half turn on set screw - Backed off 1/2 turn, re-enabled stage - Stage initialized with no errors - Repeating initialization to see if I get an error, and to note how close the plate comes to the hall sensor - Initialized fine the second time. Noted the stage slowed down before hitting the grub screw, indicating it sensed near end of stroke before hitting the end of stroke - ![[CM200 gif.gif]] - Seeing where the stage is now - All images 120kV LM 66x - X0 Y0 - ![[CleanShot 2023-05-03 at [email protected]|lg]] - X+1000 Y0 - ![[Pasted image 20230503174958.jpg|lg]] - X-1000 Y0 - ![[Pasted image 20230503174859.jpg|lg]] - Where the plate is relative to the hall sensore at X-1000 - ![[Pasted image 20230503175209.jpg|lg]] - Backed the set screw out 1/4 turn - X0 Y0 - ![[Pasted image 20230503180352.jpg|lg]] - X1000 Y0 - ![[Pasted image 20230503180522.jpg|lg]] - X-1000 Y0 - ![[Pasted image 20230503180716.jpg|lg]] - Back out 1/2 turn and re-enabled - The way this is going it looks like we might not be able to center the x axis with the setscrew, indicating the problem might be deeper. Will have to keep exploring though - X0 Y0 - ![[Pasted image 20230503181528.jpg|lg]] - X+1000 Y0 - ![[Pasted image 20230503182417.jpg|lg]] - X-1000 Y0 - ![[Pasted image 20230503182207.jpg|lg]] - Backed out 1/2 turn and reenabled - It did not seemed to touch the set screw at all this time - X0 Y0 - ![[Pasted image 20230503183503.jpg|lg]] - X1000 Y0 - ![[Pasted image 20230503183612.jpg|lg]] - X-1000 Y0 - ![[Pasted image 20230503183853.jpg|lg]] - Tried to re-enable a few times, last time I did I got a tracking error x after it hit near end of stroke but before it hit the set screw. Maybe I need to pull the hall sensor back? - Went into the lowest SA range, could not hit the edge of the holder when moving in the -x direction, but could hit the edge of the holder in the + x direction (at X575). - Because the stage is hitting the motor before the set screw, I lossed the screws that mount the x motor assembly (includes the hall sensor), an moveded it away from the column as far as I could - Got a no GNCB communication error while initilizing, first time seeing that - It seemed like it finished the init proicess multiple times, but would then keep going. Very long waits between steps - Re-init, noticed that again X did not hit the set screw - X0 Y0 After moving motor - ![[Pasted image 20230503192535.jpg|lg]] - Defenitly want to figure out why it wont move the stage all the way to the set screw during init - I loosed the drive shaft motor interface, and manuall moved the x axis stage lever as far as I could, and was still unable to get to the edge of the sample. - ### Noticed that camera chamber pressure was rising... - Notice that camer chamber pressure seemed to be going up - Was 47 when we came it - We noticed that it was up at 56 several hours after arriving, we havent done anything that should have affected camera chamber pressure - Also noticed that P1, the buffer tank guage, was right at the max of its range, 38 - Hit the Vac On button to force a buffer cycle, when we hit it P3 momentailry when up to 60 BEFORE the buffer pump down valve oppned, but after the rotary pump turned on. - Once the buffer tank was pumped back down to 30, P3 started to fall back down to 46 immedialy - This all seemes to indicate that the P3 guage is reading low relative to the actual pressure. - The type of edwards guage that is used on this system has setpoint adjustments on the guage, and its possible to tune the guage readout on the vacuum board. Will want to understand where the offset is before just chnaging setpoints. ## [[2023-04-19]] - Came in and the sample rod was not able to be fully inserted. Could see the tip of the sample rod on screen with the beam spread out in low mag. - The sample rod was not inserting far enough to enage with the X actuator mechanism - The sample rod could be moved in Y, and the Y motion could be seen on screen - Could not visually or physically identify why the rod was not able to be inserted - Removed the plate off of the front of the stage and the sample rod was able to be fully inserted. However, it does not appear that the rod was getting stuck on this plate though. - Grabbed the Y axis paddle the trips the hal sensor during homing, this seemed to avoid the worst of the stage errors. - With the rod in, we are looking at the range that it is able to travel to on screen, looking to see if booth axis are mechanically aligned to center. - X full extent - +999 - ![[Pasted image 20230419162455.jpg|lg]] - -999 - - ![[Pasted image 20230419161822.jpg|lg]] - Y full extents - -999.0 um - ![[Pasted image 20230419160957.jpg|lg]] - +999.75 - ![[Pasted image 20230419161320.jpg|lg]] - Re-enabling the stage without the tweezers grabbing the paddle to see if that changes where it homes. All images taken at LM66x - Took multiple tries to get the stage to enable - X0 Y0 - ![[Pasted image 20230419165801.jpg|lg]] - X+1000, Y0 - ![[Pasted image 20230419170144.jpg|lg]] - X-1000, Y0 - ![[Pasted image 20230419170422.jpg|lg]] - X0, Y-1000 - ![[Pasted image 20230419170730.jpg|lg]] - X0, Y+1000 - ![[Pasted image 20230419171015.jpg|lg]] - Moving Y throiugh its full range, then x through its full range.![[CleanShot 2023-04-19 at 17.21.47.gif]] ## [[2023-04-05]] ### [[Compustage]] [[To initialize the CompuStage]] - ![[CM200 Stage - 1 (1).jpeg]] - ![[CM200 Stage - 1.jpeg]] - the stage encounters multipe types of errors when attempting to initialize, and takes multiple tries to get the state to sucesfully initialize. - Below are the errors encountered after repeatdly trying to initilize the stage - Y axis motor stalled on first attemted move, tracking error y - Encoder error X during the first tilt - Y axis motor stalled during the second y axis homing step - Encoder Error X during the first tilt - Tracking Error Y on first y homing step - Tracking Error Y on first Y homing step - The last 2 Tracking Error Ys happened when the y axis was already at is left end limit, and did not move at all - The 1st Y step completed sucsefuly, then got a encoder error x during the tilt homing - Encoder Error X when tilt homing started - Encoder Error X when tilt homing was going back to center - Tracking Error Y On first y homing step - Motor was being driven with +12V (+ on green wire), stage was not moving - After tilt alignment, stage was stalled with +12V on y axis, and y axis all the way to the left. Pulled on Y encoder to trigger a tracking error Y to get the stage to stop. - Y axis motor is positive (on green wire) when moving to the left - Tracking Error Y after Y axis stalled during 2nd y homing step (with stage all the way to the left). Let it run until error this time - During a "normal" (IE not stalled) move, there is uslaly ~5v across the motor - Found a wire between the Y axis end sensor and the plate intended to trigger it - Rerouting the wire lets the axis travel furthure, to the poing that it completly disengages from from the stage and leaves the ceramic ball that is between the actuator rod and the rest of the stage lose. - ![[IMG_9106.jpg|lg]] - ![[IMG_9102.jpg|lg]] - Encoder X Error during the final x axis homing step - Encoder x error during inital Y homing (before y even made it to the left side) - Sucsefully homed - Tracking Error Y, fully disengaged from the stage leaving the cermaic ball floating - ![[Pasted image 20230405165249.jpg|lg]] - Electrially testing the sensor in this configuration where the plate should have tripped the sensor - What is should be: - Blue = Gnd - Brown = +12 V - Black = signal (depending on the model of sensor, this could be NO or NC. You can tell by what pin on the 4 pin connector it is wired to. Pin 3 = NC, Pin 4 = NO) - ![[Pasted image 20230405165743.jpg|lg]] - Can see that the black wire is wired to pin 3 - What we actually measure - +12v between blue and brown - +12v between blue and black - This means that the NC line of the hall sensor is open - After resettig and attempting to re-enable the stage, got a tracking error y after the motor closed the air gab between itself and the stage - After another reset, When the stage got far enough away from the sensor the NC line dropped from 12V TO 0.8V - During a Y-axis stall, where the motor is continually trying to drive into the end stop, the sensor reads 12V - Testing the control sequence with an osiliscope - - ![[Pasted image 20230405175205.jpg]] - Yellow = Motor voltage - Postive voltage is movement to the left, twoards the end stop - Blue = end stop state - Low = out of range of hal sensor - High = in range of hal sensor - As the motor moves to the end of its range, it triggers the end of stroke hal sensor (blue) - Tracking error y, motor was already at end limit and drove to rengage with the stage. - ![[Pasted image 20230405183702.jpg]] - Yellow = motor voltage - Blue = encoder output - Stage enabled correctly, capture of what it looks like to hit the soft end of drive limit on the Y axis using the joystick - ![[Pasted image 20230405184214.jpg]] - Yellow = motor voltage - Blue = encoder output - With the stage enabled, drove the stage in Y away from the end of stroke hal sensor. During this got a Unexpected End of Stroke error - ![[CleanShot 2023-04-05 at [email protected]]] - Yellow = motor voltage - It is negative because it was being driven away from the stage - Blue = encoder output - Tracking error Y during the initial homing. The motor stalled against the HAL sensor. It looks like the motor speeds up when the encoder starts to slow - ![[Pasted image 20230405190221.jpg]] - Yellow = motor voltage - Blue = Encoder output - ## [[2023-03-22]] ### Startup - Starting Pressures: - P1: 33 - P2: 54 - P3: 46 - IGP: 17 - Starting Coil Currents (80kV) - ![[Pasted image 20230322155700.jpg|lg]] - Goals for today - Check HV stability and condition up to 110kv - Check movable apurtures for contamination - Rebuild aperture drives - Maybe work on compustage - Going to use the back focal projection in diffraction mode to check stability - During ramp up will stop and beam shower the emission chamber several times. ### Beam Shower To [[beam shower]]: - Ramp up HV to target voltage + 5kV, then back to target voltage - watch for discharges via IGP pressure and emission meter - Saturate the filament - Turn on the HV wobbler, and use the focus step size knob to set to the largest wobble. - To turn on the HV wobbler, go to the alignment screen, select `ROT CENTER` (top right), then set the rot center mode select (bottom right) to `VOLT` - ![[Pasted image 20230322155406.jpg|lg]]~ - Started beam shower at 80kV for 5 min #### Checking HV stability via back focal - Go to an empty grid square, or better yet ==remove the specimen completely.== - Spread beam over screen in the low SA range - Go into diffraction, set camera length to 6.2M - If beam goes off screen while trying to get to high camera length, and you cannot bring it to center with the shift XY knobs, perform diffraction alignment procedure ([[CM Diffraction Alignment]]) - Get a caustic image - After getting caustic, rotate the focus knob to the left to under focus the image to reveal the back focal plane. - ![[CleanShot 2023-03-22 at 16.48.06.gif|lg]] - Because the beam goes so far out before coming back to the center, the bright ring is very sensitive to changes in high voltage - What .05kv changes look like in the back focal (if you do have instability it may be less significant than this) - ![[CleanShot 2023-03-22 at 16.51.26.gif|lg]] - You can use the optical microscope to more closely scrutinize the inner bright edge for signs of movement. - We ran the microscope up to 105 kV, then check stability at 100kV. Did not see any signs of HT instability over the course of several minutes. ### Checking for aperture contamination - To check condenser, go to low mag and spread the beam out some. Move the aperture around to establish what is on the apurture holder or not - To check objective, use the largest condenser aperture, go to low mag, and cycle through apertures | Aperture | 1 | 2 | 3 | 4 | | -------------- | ----- | ------------------------------- | ----- | ----- | | Condenser | Minor | Minor | Clean | Minor | | Objective | Clean | * | Clean | Minor | | Selected Area | Clean | Clean | Minor | Clean | * Objective aperture #2 had a fiber covering it "like a spider" but it flew away under the beam ## [[2023-03-15]] [[To initialize the CompuStage]]: Modes > TEM > CompuStage > CompuCtrl (top right) > Enabled (bottom left) It has recurring errors, but after trying enough times in a row it initialized. - Inserted a specimen, adjusted eucentric height - want to make sure the objective is focused in the right spot before we continue with alignments - Adjusted rotation centering - Gun align procedure - At spot size 4, the beam deflectors are set to their extremes and the shift knobs don't work - Very weird, but we can skip spot 4 for now - Another round of gun align procedure - Column align procedure - Ignored instructions to insert the SA aperture ## [[2023-03-11]] - Regreased and installed HV bushing in tank - HV interlock open between X53-X54 - Out of VDB through X16-9, back through X16-10 - The microswitch on that cable is open - Found where it should be installed next to the gun - Installed bellow the gun cable - While installing, the bottom of the switch touched metal, and it pulled down the vacuum interlock lines. Restarted the vacuum system - Chilled in the cryo shield to get pressure down faster - Got a beam!! - Saturation current around 23 mA - Column seems reasonably well aligned physically since we got a beam immediately - But not aligned well enough to test HT stability by viewing the back focal plane - Adjusted eucentric height - wondering if the service stage alignment might also need to be done - Went up to 60kV, want to check HT stability more to make sure the system is in good shape before we take it up any farther - Started looking for contamination in the column - Found some kind of insulated dark object - Worst charging was in the middle of the column ## [[2023-03-08]] Inspecting the VDB - The cable plugged into X16 is disconnected at the other end - Per schematic (Fig 595-6), goes to SF6 valves. - The +24V vac interlock is jumpered through this cable, so it has to stay plugged in Checking jumpers against schematic (Fig 595-8): - X22-X23 jumpered - Goniometer foot switch, which isn't connected right now - X28-X29 jumpered - Mains interlock, should be jumpered per schematic Remote jumpers: - X20-X21 - goes to IGP interlock X8 (Fig 595-1) - X32-X33 - Goes to different interlocks depending on the version of the system ![[IMG_4591.jpg]] RP cord was spliced to ICE cord. Also found a loose connection on the rotary pump cord (M5-X7). We fabricated a new cord reusing existing connector. New: ![[IMG_8573.jpg|grid]] Old: ![[IMG_8572.jpg|grid]] Also inspected DP heater power cable (M5-X8), tightened up connections which were a little loose. - Interlock testing - Interlocks to test: - DP Water Out - Lens Regulator Water Out - Lens Flow Meters - DP Water Out Test - Wait for the DP to warm up fully - Activate camera air so that V3 closes - Pinch off the water supply to the DP - While waiting for the DP to warm up we worked on getting a filament in the microscope. - While centering the filament in another room the interlock was tested when the high pressure cut off on the water chiller shut the compressor down - The water flow to the chiller was not turned on fully - The high pressure interlock on the chillers compressor tripped - With the compressor disabled, the water tempurture reached the high water temp interlock on the chiller, and it shut off completly - To reset this, there is a small black button on the top right of the compressor pressure interlock - ![[CleanShot 2023-03-11 at [email protected]|lg]] - With no water flow the ODP water over temp interlock tripped. - Cleaned, regreased with silicon dielectric grease, and reinstalled HV bushing for electron gun - [!] need to do the same to the bushing on the tank side ![[IMG_4602.jpeg|grid]]![[IMG_4599.jpeg|grid]] ## [[2023-03-02]] Opened up and cleaned the IGP power supply Took all the rack mount power supplies and the 24V supplies outside and blew all the dust out. The 24/25V supplies were the dustiest. ## [[2023-02-15]] - Microscope On - Audible air leak coming from V20-1 solenoid - Have already replaced o-rings in V20-0, so not surprised. - Replaced 2 orings that go between the solenoid and the manifold. - Flat o-rings - ![[Pasted image 20230215172311.jpg|lg]] - Will replace all o-rings when available - Screen came up solid, like it was doing when we first came on site - ![[Pasted image 20230215171710.jpg|lg]] - Reseated the computer cards again. We only sprayed deoxit, we did not actually clean the card edges or their receptacles. - Computer came right up after this. - Vac system testing - Want to ensure that a few common failure modes are not happening. - On of the most likely to cause back streaming is the rouging valve to the column not opening. The only vacuum gauge the microscope uses to rough down is on the pump fore line. So, if the valve fails to open the microscope will assume the column is pumped down even if it is still at atmosphere. Having assumed it is pump down it will then open to column to the DP, and back stream the system. - Monitored pumping system during startup, sequencing looked good. - Let the DP warm up, did not get any errors about DP temp, water, or oil. - Once DP was warmed up, microscope re-pumped the column through V10, the camera chamber through V2, then connected the camera to the column through V6. - Once the column and camera was roughed down, it opened V1 to back the buffer tank, then V3 opened the connect the the DP to the camera chamber and column. - The P3 ion gauge started to drop bellow 99 after the DP was connected. - Opened V3 at 62, if the IGP interlock were not unplugged, it would have tried to turn the IGP on at this point. - Lowest pressure reached before we left was 59 - Shut the microscope down as we have not fully tested the interlocks. ## [[2023-02-08]] Pulled the cold cathode gauge to check (it was reading 0) ![[IMG_8053.jpg]] - Cleaned out gauge, now reads 99 on start up ### Supplies we need to have around - [x] Lens tissues - [x] Alcohol - [x] Gloves - [x] Metric allen wrench - [x] Multimeter - [ ] Blowoff tool ## First Start [[2023-02-02]] (with us on site) - Repaired leaking V20 solenoid valve. O-rings between valve and valve block were leaking - Turn main power on, hit Microscope On - Few relays clicked, but no CRT display - Put hand over the photocell next to the vac on/off, crt flickered - Wiggled photocell a bit, CRT comes us bright, but is just solid white. - The photocell is the round thing next to the UHV light - ![[Pasted image 20230202180141.jpg|lg]] - There was no beep after 1 minute (about how long the prom and RAM check take), and there was no beep from rotating the intensity knob. - Shut down microscope, went around back and to check on the intel computer cards (the 4 cards in the top left rack, but bellow the STEM unit). These are the only cards on the microscope to use card edge connectors. Pulled the cards and they felt very stiff and stuck in there. - Pulled all cards and applied [[DeoxIT D5]] to card edges. I reseat each card with the Deoxit on it 5 times. - Turned microscope on, RAM check came up on screen and passed - Got several messages - Service key installed or softkey diagnostic program - A compustage y axis error - Hit vac on - Got a hissing noise coming from the top of the column - The tube that goes to the Y18 solenoid valve was not connected. (Y18 is the pump down valve for the SF6 chamber around the top of the gun) - The fitting on Y18 had been replace with swageloc, but the fitting on the tube had not been - Blanked off the tube going to Y18 as its not needed to start, but is attached directly to the PVP manifold, so was unable to pump at all. - Hit Vac On - P2 started at 64 - P2 quickly passed 32 - V1 Opened - P1 jumped back to 64 - P1 dropped to 34, ODP turned on - P1 dropped to 28, V1 closed - Opened V10, started pumping gun - After a minute or so opened V5 - Hit vac off, stopped pumping column - The DP did not turn up - Hit Vac On then Vac Off, ODP shut off but also got ODP CIRCUIT at the same time. - Not sure if the ODP circuit alarm is real or something to do with starup.