## [[2024-11-25]] - Converting system to turbo pump turned out to be a bad idea given the springs used for vibration isolation - Converted system back to diffusion pump - Drained oil in main diffusion pump and replaced with 100CC of new Lion S oil. - need to recalibrate PI3 as a result of switching back to DP - Adjusting VR4 to set its PiG3 Lamp Off signal to trip at 120uA - Using RP to pump down the buffer tank, then as pressure gets to 120uA closing V2 to hold tank at 120uA - Adjust VR4 slowly upwards until PiG3 lamp goes out - Open V2 to pump down buffer tank past 120uA to verify where setpoint currently is - Lamps went off at 122uA - Tested heater warm sensor interlock by shorting 1 min timer pins while heater lamp was still on, system shut down once 1 min timer was up - Tested that the water out over temp shuts down microscope within 5 minutes of water supply turning off. It shut down after 3min 30 seconds. - Got a beam and tested out the EDS detector. ## [[2023-09-14]] I broke the standoff behind the vacuum board, need to order a spare. ## [[2023-06-24]] Symptoms: - No emission current Diagnostic performed: - Vented gun and probed between filament pins - open circuit - Removed cable, removed some grease, reassembled cable to bushing - Tensioned until continuity between filament pins - Pumped gun back down - still no emission - Vented gun, checked continuity between filament and wehnelt - open circuit - possibly done at bias 9, but unknown - Set bias to 1 or 2, then probed between center filament pin and top Wehnelt ring - 1.29 MOhms - Set to bias 9 - 16.6 MOhms (and changing) - This proves that the multimeter can measure this - Tested continuity between Wehnelt and Wehnelt pin - low resistance - Investigating Wehnelt contact spring - filled with silicon grease ## [[2023-04-11]] Changed filament Last filament spacing = .75 turns This filament spacing also = .75 turns ## [[2023-02-24]] ### Testing the [[Spicer Consulting]] Field Canceling System Experimental setup: ![[IMG_4489.jpg|lg]] Spicer Z on (.141 mG) / Spicer Z off (1.84 mG) / Spicer polarity inverted (7.08 mG field): ![[Spicer Z On.jpg|grid]]![[spicer z off.jpg|grid]]![[7mg field (z coil reversed).jpg|grid]] Taken at 190,000 mag, 14 mm WD, 20 kV FFTs processed with ImageJ: ![[FFT of Spicer Z On.jpg|grid]]![[FFT of spicer z off.jpg|grid]]![[FFT of 7mg field (z coil reversed).jpg|grid]] Measuring the waveform of a single spot in SPT mode Cursors are at 30 Hz Spicer Z on / Spicer Z off ![[IMG_4491.jpg|lg]]![[IMG_4492.jpg|lg]] Going back and forth: ![[trim.79482F21-846A-4257-BE10-26CA7AAAA52F.gif]] Going back and forth between Z off and Z on field reversed: Cursors are now 60 Hz ![[trim.6EC8CD89-79B4-4DAA-9E66-0CE5D451B660.gif]] Image on CRT with Z on reversed / Image on CRT with Z on, not reversed: ![[IMG_4498.jpg|grid]]![[IMG_4501.jpg|grid]] ![[Screenshot 2023-02-24 at 2.23.08 PM.png|grid]]![[Screenshot 2023-02-24 at 2.23.31 PM.png|grid]] ### Setting up in 3 axes >HX: .075 mG HY: .064 mG HZ: .150 mG With X, Y, and Z canceling on / With no field canceling: ![[all on.jpg|grid]]![[all off.jpg|grid]] Taken at 100,000X 46mm WD, 10 kV In the left image with field canceling on, there is a noticable difference in the size of sawtooths on the left vs right side of the object. ![[all fields canceled.jpg|grid]]![[all field canceling off.jpg|grid]] ## continued investigation of noise [[2023-02-23]] Measured voltage across OL foot resistor on Lens Cont (1) PB (U15) between TP13 and ground (TP14) in AC coupling again. Didn't see the same random noise we saw [[6400 Bringup Log#Measuring on Lens Cont (1)|last time]] Using TP14 as ground, we tested: TP13 = OL TP9 = CL2 TP4 = CL1 They all look the same ### Testing the scan coils Test points are on the back of the Mag Pwr Amp unit (in the water cooled bay) TM3 = Vertical Input from Scan/Mag TM4 = Upper Vert TM5 = Horiz Gnd TM6 = Upper Horiz TM7 = Lower Horiz TM8 = Vert Gnd TM9 = Lower Vert #### TM3 (Vertical Input) to TM5 ![[IMG_4433.jpg|lg]] #### TM6 ~~(Upper Horizontal)~~ Vertical to TM5 ![[IMG_4434.jpg|lg]] Zoomed in in time: ![[IMG_4435.jpg|lg]] #### TM9 ~~(Lower Vertical)~~ Horizontal to TM5 ![[IMG_4436.jpg|lg]] Is this actually vertical? #### Changing scan rotation When scan rotation is set to about kv 6°, the "jitter" in the vertical scan goes away The "jitter" changes size when I turn the scan rotation knob ### Testing coils on Lens Cont (2) U12 #### Image shift coils TP 7 and TP 8 = image shift coils The noise around the image shift coil voltage seems to be significant compared to the change of one click of image shift knob ![[trim.6635F8BD-8759-4054-8615-6BC18A67F338.gif]] ![[trim.45CDA3EF-F18B-443A-AD7A-5D873153CC6B.gif|grid]] this is at 95,000X This is the image shift coil in fast scan. The cursors are at 60Hz. Theory: The difference between noise appearance in fast and slow scan is horizontal linescan being induced into the image shift coils because the image shift coils are wrapped around the deflector coils - the coils are inductively coupled ![[IMG_4448.jpg|lg]] Baseline noise: Probe grounded to itself ![[IMG_4451.jpg|lg]] Probe and probe ground are both on the ground of Lens Cont (2) PB: ![[IMG_4452 2.jpg|lg]] Removed the ground prong from the oscilloscope power cord (what? don't do this at home) ..... It looks the same: ![[IMG_4453.jpg|lg]] Now feeling more confident that we are seeing actual noise, not a ground loop w the oscilloscope Image shift coil Y in slow scan: ![[IMG_4454.jpg|lg]] ==what is the source of this noise?== Both probe and ground on the power rail ground: ![[IMG_4455.jpg|lg]] Ground on power rail ground, probe on test point G (also gnd) ![[IMG_4456.jpg|lg]] #### Gun align coils G to TP1 (Gun Alignment): ![[IMG_4458.jpg|lg]] G to TP2 (Gun alignment): ![[IMG_4459.jpg|lg]] G to TP3: ![[IMG_4460.jpg|lg]] Almost no change on this when going into fast scan Ground rail to TP3: ![[IMG_4461.jpg|lg]] #### stig and other coils Ground rail to TP4: ![[IMG_4462.jpg|lg]] Ground rail to TP5 (stigmator): ![[IMG_4463.jpg|lg]] ==notably very low noise== Ground rail to TP6 (also stigmator): ![[IMG_4464.jpg|lg]] #### back to image shift coils Ground rail to TP7: ![[IMG_4466.jpg|lg]] G to TP7: ![[IMG_4467.jpg|lg]] ![[trim.556760D4-A033-4807-A8CB-80310AA0F4E8.gif]] It's being weird transiently.... unless it's the probe? This is what turning Image Shift Y looks like: ![[trim.66E06B50-4844-49CD-BB6B-CAA23DA7ABB1.gif]] While doing this testing, the signal got even noisier. Difference between fast and slow scan: ![[IMG_4475.jpg|lg]] ### Measuring leakage current We are starting to suspect a ground loop Using Fluke clamp-on current meter No measurable leakage current when clamping on the main frame ground strap (noise floor is about 2 mV) Column ground - nothing ### just observing stuff Noise does scale with magnification as you zoom in DP off - no change in image RP off - no change in image ## continuing power regulator investigation [[2023-02-22]] ### Checking PS RGLTR (2) - Measuring DC voltage + AC ripple at each power supply with multimeter - Observing ripple with oscilloscope #### 11 +24V +23.532 VDC 7.97 mv AC ripple 33.8 kHz noise ![[IMG_4396.jpg|lg]] #### 10 +5V +5.0355 VDC 1.6 mV AC ripple #### 9 -20V -20.081 VDC 3.00 mV AC ripple ![[IMG_4397.jpg|lg]] 132 mV AC ripple at 60Hz according to oscilloscope #### 8 +20V +19.807 VDC 6.552 mV AC ripple ![[IMG_4398.jpg|lg]] #### 7 +5V +5.0331 VDC .5 mV AC ripple ![[IMG_4399.jpg|lg]] #### 3 -20V -20.280 VDC .05 mV AC ripple ![[IMG_4400.jpg|lg]] #### 2 +20V +20.173 VDC 0.000 mV AC ripple ![[IMG_4401.jpg|lg]] #### 1 +5V +5.0203 VDC 0.000 mV AC ripple ![[IMG_4402 2 1.jpg|lg]] #### 19 -20V -20.288 VDC 0.000 mV AC ripple ![[IMG_4403.jpg|lg]] #### 6 -20V -19.945 VDC 0.000 mV AC ripple ![[IMG_4404.jpg|lg]] #### 18 +20V +20.344 VDC 0.000 mV AC ripple ![[IMG_4405.jpg|lg]] #### 5 +20V +20.111 VDC 0.000 mV AC ripple ![[IMG_4406.jpg|lg]] #### 4 +5V +5.0147 VDC 0.000 mV AC ripple ![[IMG_4407.jpg|lg]] #### FIS +5V +5.0614 VDC 0.000 mV AC ripple ![[IMG_4408 2.jpg|lg]] #### 17 -20V -20.130 VDC 0.000 mV AC ripple ![[IMG_4409 2.jpg|lg]] #### 16 +20V +20.185 VDC 0.000 mV AC ripple ![[IMG_4410.jpg|lg]] #### 15 +5V 0.000 mV AC ripple +5.2092 VDC ![[IMG_4412.jpg|lg]] ==1.352 V peak-to-peak at 60 Hz== !!!! this is the power to the rack ##### Measuring voltage going in to the regulator It looks exactly the same ##### Tracing out the path of this supply MC3 from power supply, through 15 +5V, out MC10 to the rack ##### what's going on here? The multimeter measures a 5V potential, the oscilliscope probe does not even in DC coupling Looks like this supply is not grounded. The waveform may be an artifact of probing a floating potential. #### 14 -15V -15.068 VDC 0.000 mV AC ripple ![[IMG_4413.jpg|lg]] #### 13 +15V +15.066 VDC .18 mV AC ripple ![[IMG_4414.jpg|lg]] #### 12 +12V >The +12V output should go to MC9 pin 9 -> FS13 FIS unit The only thing it's doing on this system right now is powering the cooling fan we installed. At first we thought this regulator was missing because the output was supposed to be connected with red wire, but red striped wire was used instead +12.191 VDC 1.2 mV AC ripple ![[IMG_4416.jpg|lg]] ## still looking for the source of noise [[2023-02-20]] ### Measuring on Lens Cont (1) Measuring voltage across OL foot resistor on Lens Cont (1) PB (U15) between TP13 and ground (TP14) in AC coupling ![[IMG_4291.jpg|lg]] there's some random noise here, and maybe some regular noise too? Measuring -15V supply: ![[IMG_4293.jpg|lg]] The cursors are at 30Hz - this noise is very suspect Measuring from 5V ground to frame ground: ![[IMG_4294.jpg|lg]] Measuring from +5V to frame ground: ![[IMG_4295.jpg|lg]] Measuring from +5V to 0V (5V): ![[IMG_4296.jpg|lg]] ### Measuring inside the power supply box All points measured to case ground. Lens +15V: ![[IMG_4301.jpg|lg]] ![[trim.8090C8ED-6300-4246-AABC-C95F420CBC7F.gif]] Lens -15V: ![[IMG_4306.jpg|lg]] Image +5V: ![[IMG_4311.jpg|lg]] begin rigorous data collection: #### Image +5V ![[IMG_4325.jpg|lg]] Cursor is at 0 and +5V #### Lens +5V ![[IMG_4326.jpg|lg]] #### Lens +24V Cursors are at 0 and +24V ![[IMG_4327.jpg|lg]] #### Lens +15V ![[IMG_4329.jpg|lg]] #### Image +15V ![[IMG_4330.jpg|lg]] #### Image +24V ![[IMG_4331.jpg|lg]] #### CRT +24V ![[IMG_4332.jpg|lg]] #### Lens -15V ![[IMG_4333.jpg|lg]] #### Image -15V ![[IMG_4334.jpg|lg]] #### HT +45V ![[IMG_4335.jpg|lg]] #### HT +15V ![[IMG_4336.jpg|lg]] #### HT -15V ![[IMG_4337.jpg|lg]] #### HT +24V ![[IMG_4338.jpg|lg]] #### HT +5V ![[IMG_4339.jpg|lg]] #### SPS40 +5V ![[IMG_4340.jpg|lg]] 🤔 #### SPS40 +20V ![[IMG_4341.jpg|lg]] #### SPS40 -20V ![[IMG_4342.jpg|lg]] #### Scan/Mag +5V ![[IMG_4343.jpg|lg]] #### Scan/Mag +20V ![[IMG_4344.jpg|lg]] #### Scan/Mag -20V ![[IMG_4345.jpg|lg]] #### Display 1 +5V ![[IMG_4346.jpg|lg]] #### Display 1 +20V ![[IMG_4347.jpg|lg]] #### Display 1 -20V ![[IMG_4348.jpg|lg]] #### Display 2 +5V ![[IMG_4349.jpg|lg]] #### Display 2 +20V ![[IMG_4350.jpg|lg]] #### Display 2 -20V ![[IMG_4351.jpg|lg]] #### Panel +5V ![[IMG_4352.jpg|lg]] #### CRT-HT2 +24V ![[IMG_4353.jpg|lg]] #### FIS +5V ![[IMG_4354.jpg|lg]] #### FIS +15V ![[IMG_4355.jpg|lg]] #### FIS -15V ![[IMG_4356.jpg|lg]] #### Mag Pwr JL1 + ![[IMG_4357.jpg|lg]] #### Mag Pwr JL1 - ![[IMG_4358.jpg|lg]] #### Mag Pwr JL2 + ![[IMG_4359.jpg|lg]] #### Mag Pwr JL2 - ![[IMG_4360.jpg|lg]] ### Measuring inside the power regulator (1) #### CRT +24V ![[IMG_4370.jpg|grid]]![[IMG_4371.jpg|grid]] Frequency = 31.64 kHz #### all the other ones Are flat lines, like this: with a little noise (900Hz) #### Water leak Replaced the O-ring on the water line ![[Pasted image 20230220181240.png|med]] >[!Replacement specs] >ID: 10.8 mm CS: 2.4 mm There's some green stuff on it (corrosion byproduct) The other side of the fitting needs cleaned The whole water cooling loop of the microscope should be flushed with CLR sometime soon to clear out buildup. ## EDS Calibration Ran the fine gain calibration at all 8 points using the Cu standard from the X-Checker Parameters used: Microscope: - CL (probe current) 5 - 8 - 15° stage tilt - 20 kV - 15 WD NSS: - Symbol: Cu, Line: K - Cursor location: 8.041 eV - Maximum iterations: 2 ## Magnification Calibration - Current X/Y ratio as measured on 40µm grid on [[X Checker Standard]] is .8382, so the image is shorter than it is wide - After recalibration as described in [[6400 Alignment]], ratio is now above .99 ## Sawtooth noise [[2023-02-03]] - Noticed excessive sawtooth noise at magnifications as low as 50d00. ### 10 kV 65kX #### 14 mm WD vs 48 mm WD ![[10kv 14mm 65kx.jpg|grid]]![[10kv 48mm 65kx.jpg|grid]] ## another filament issue [[2023-01-30]] No emission current on the meter while turning up filament heating current... - Pulled out the filament and tested continuity with a multimeter - Resistance = 0.20 Ohms Observation - emission meter does move when HV comes on Tried jiggling the HV card in the card rack Unplugging D4 - with this unplugged, the system is unable to generate high voltage ![[7B2868C1-647C-4FCC-98B0-F200A25A9146.jpg|med]] Connector D5 housing was loose ![[trim.80A6B918-DAE6-405F-B604-68A67A916EC6.jpg]] Tested continuity across all pins of this cable. Tightened the housing with this set screw: ![[IMG_4044.png|med]] Looking for socketed ICs - Only socketed ICs are on the motor driver - Reseated them Full visual inspection of the HT control board - [ ] todo: fan in the Noran control box is dying ![[IMG_4047.png|grid]]![[IMG_4051.png|grid]] ![[IMG_4053.jpg|lg]] ... no change ### Probing test points +45V: +45.12-45.13 VDC - AC ripple: 0.2 - 0.3 VAC -15V: -15.214 VDC - AC ripple: none +15V: +15.075 VDC - AC ripple: none +24V: +23.912 VDC - AC ripple: none *turned HV off* Measuring constant current mode Open up pressure bleed plug - tank pressure is definitely equalized now turned HV on 5kV, turned up filament current - no movement on the emission meter Testing wires that feed D5, in VAC frequency mode Point 14: center of filament transformer Point 16,18: sides of filament transfer Point 14: 24.65 kHz +- .05, .2967 VAC Point 16: 24.631 kHz, 37.34 +- .05 VAC Point 18: 24.637 kHz, 37.25 +- .05 VAC **No change** observed when turning filament heating current knob. TP5: Filament current meter TP5, filament knob all the way down: 1.2693 VDC, 15.4 mVAC ripple **No change** observed when turning filament heating current knob. Filament potentiometer R101 (10K Ohm) Knob at minimum: 2.8416 VDC Knob at 12:00: 4.6853 VDC Knob at max: 6.60 VDC Switching to oscilloscope to probe AC stuff Point 18 (wrt gnd): - make sure probe is in 10X ![[IMG_7104.png|med]] Point 16 (wrt gnd): ![[IMG_7105.png|med]] Point 14 (wrt gnd): ![[IMG_7106.png|med]] No change at these points when turning filament knob Noticed that blue BNC (D7) was unplugged After plugging it back in (while HT off), glow discharge thing was arcing internally D7 - HV feedback Trying again with the cable plugged in Switched from constant current mode to constant voltage mode Now there is a response on Point 16 when turning the filament knob ![[trim.9343C1A1-1DA1-43FA-A6F4-4E3BAB9D3040.jpg]] Testing cable D5 - Between pins 1 and 2: 0.32 Ohms - 1 and 3: 0.35 Ohms - Multimeter clip to multimeter clip: 0.11 Ohms - 2 and 3: 0.23 Ohms pin 2 = center tap pin 1 and 3 = sides of filament transformer Measuring between point 18 and point 16 with cable unplugged: 130 MOhms With cable plugged in: 0.38 Ohms Between point 14 and point 18 with cable unplugged: 125 MOhms With cable plugged in: 0.27 Ohms Observations - There is a waveform going to the filament transformer - The waveform varies with the knob - There is continuity to the filament transformer Looks like the filament transformer is functioning properly; moving on to the gun Between filament pins: No continuity ![[430E205F-98D8-4C0E-80A6-EF294A618EF8_1_102_o.jpeg|med]] Top pin to Wehnelt:! ![[B0AB92D8-59BD-472B-9C3B-A27E6670093F_1_102_o.jpeg|med]] Bottom pin to Wehnelt: ![[6D19007F-01DE-497C-A3DD-68F62AAC0127_1_102_o.jpeg|med]] ## HV issue? [[2023-01-27]] Emission current starts wobbling on startup Only happens when you turn filament heating up a certain amount At lower emission current, the beam is stable Just before filament heating knob is about halfway - a bit of wobble is visible, less than the width of one tick mark of movement Filament current is at 200, emission at 90 When filament heating knob is at halfway - really starts to be an issue Emission current stabilized lower - 80, then increased to 90 Filament current at 210 Saturated at filament current ~282, emission current 210 Very irregular - sometimes slow increases in current, sometimes fast Seems like something is charging and discharging ![[trim.094354F5-8F54-4A58-B9D4-A94301261A32.jpg]] After running for a while, it always stabilizes Diagnostic plan: - [x] Probe scan - [x] Run at lower kV - [x] Look in the gun - [ ] Electrical testing on the tank Reasons for things to be transient: - ~~Scanning~~ - eliminated bc problem still shows up in source view - Charging - Unlikely to be anywhere below the anode - Thermals - parts that get warmer when emission current increases - Filament itself can grow or shrink - Filament to Wehnelt termination - Connectors in HV system - HV tank - Isolation transformers Steps taken: Pulled out the Wehnelt - The spring ring was missing Cleaned up a spring ring from another Wehnelt and reassembled The filament was broken (not sure if this happened during wehnelt disassembly or not) Aligned a new filament Cleaned old grease flakes off of the HV cable Applied silicon dielectric grease to the cable in a smooth consistent layer Replaced cable in HV tank, re-tightened nuts to hold it in Results: Got a beam, went up to 20 kV, no wobbling observed so far ## PM items - [[2023-1-13]] changed [[scintillator]] - DP overheat shutoff scope after 2M45S ## Remaining todo before key-turn - [x] Finish Cabling Console - [x] Finish Cabling Power Supply - [x] Fill RP with oil - Using one of Adam's JEOL RPs, not Chris's - Refilled with some brown ass with some brown ass oil from another pump - [x] Connect Vacuum Lines - [x] Connect Water Lines ## [[2023-01-07]] First Key Turn - Vac Board in manual, all switches off - Tested circuit breaker via test button, tripped. ![[IMG_3045.png|grid]] - Starting with OPE power off - Pump is noisy - Turned Key ![[IMG_3044.png|grid]] - Starting pressures - PG1 268.19 - PG2 265.41 - PG3 249.25 - Opened V2, pressure started to fall ![[IMG_3046.png|grid]] - Got PG3 past 150. Going to do a V2 seating test ![[IMG_3047.png|grid]] - With valve fully seated for sometime, opened V6 and V5 to get air on backside of V2. Will repeat with much shorter timeing - Did same test but faster, did not see a rise in V2 - Valve actuation testing - V3: good - V4: good - V5: good - V6: good - To test V1A, V1B, and V7, pressure needs to be equalized between all of them, so open V2, V4, V3, V6 - V1A: good ![[IMG_3049.png|grid]] - V1B: good ![[IMG_3050.png|grid]] - V7: good - V7 seating test - Closed all valves - Opened LV3, did not see a spike on pressure spike on PG2 - DP startup - Both DP warmed up, heater and PG3 warnings both went out ![[IMG_3051.png|grid]] - Pumpdown - Installed filament - Backed off 1/2 turn + a smidge ![[IMG_3053.png|grid]] - Turned on computer - Scan speeds are variable and working - Restarted after installing gun cable - Computer was not completely responsive and no image on screen - The power cable to the HT tank control board was slighlty unplugged, plugged back in and restarted. Computer came up properly. - No scan on left CRT - Wiggled boards around, found that scan gen 1 would cause beam to flicker on screen if I was in WFM - I reseated all cards, no effect - I cleaned all of the cards in the scan mag unit with Deoxit D5, this got got scan on the left CRT - Not seeing any response from contrasst. Dont think SE detector signal is making it to the FIS. - NA5, NA6, K1, and several other BNC cables were plugged into the wrong ports - Despite having contrast maxed out, I still did not see any noise on screen - I remembered that PMT link can automatically scale contrast, and that having it on reduces the maximum contrast setting - Turning off PMT link and setting contrast the maximum got me PMT snow on the CRT - Beam finding - gun shift coils have an affect on the intesnity of the snow, good sign. Sweeping them did not get a bright beam however. I set gun shift to the maximum brightness - The PCD would pick up current when inserted, but it did not have an effect on the brightness of the little bit of image I was able to see on the CRT. - This hinted at the objective aperture being misaligned. Moving it around and all of a sudden got a bright image -