[[PSU CM200]] ## [[2023-09-20]] - We determined that [[Teflon]] was not the right material choice for the spring insulator cup, as teflon is one of the worst performing insulators in terms of radiation resistance. - We thought about using [[Rexolite]], as it has the insulating properties needed and excellent radiation resistance - Instead the plan we came up with was to negate the need for the spring all together - We modified the fins so that we could use small split rings to attach the resistor leads directly to the fins. - Adjusted all of the safety gaps to 1.7 mm using a stack up of feeler gauges. - - ![[Pasted image 20230920163718.png|med]] - ![[Pasted image 20230920163745.png|med]] - ![[Pasted image 20230920163802.png|med]] - ![[Pasted image 20230920163813.png]] - ![[Pasted image 20230920164541.png]] - ![[Pasted image 20230920164555.png]] - ![[Pasted image 20230920164637.png]] - Note some pictures are with the teflon insulators installed ## [[2023-08-02]] Started assembling pieces of electron gun that we cleaned last week. Modified the assembly tool - shaved down the mandrel so the rings don't get stuck on it ![[CleanShot 2023-08-02 at [email protected]|lg]] Note that these two pieces are different sizes: ![[CleanShot 2023-08-02 at [email protected]|lg]] The smaller one goes in first. The smallest clip ring goes on the smallest plate. ![[Pasted image 20230802133613.png|lg]] Don't stretch out the ring while putting it in place! ![[Pasted image 20230802133803.png|grid]]![[Pasted image 20230802133815.png|grid]]![[Pasted image 20230802133826.png|grid]]![[Pasted image 20230802133844.png|grid]] Inserting the ring into the gun: at an angle vs straight down ![[Pasted image 20230802133936.png|grid]]![[Pasted image 20230802133958.png|grid]] ## [[2023-07-05]] Unscrewed the "accelerator button" (similar shaped part to anode on CM12) ![[Pasted image 20230705150444.png|grid]]![[Pasted image 20230705150511.png|grid]] Screwed it backed in, because it doesn't need to come out now - we need to use it to pull the rest of the assembly out. Installed this tip on the service tool: ![[Pasted image 20230705151811.png|grid]]![[Pasted image 20230705151854.png|grid]] The tips are installed on the service tool by threading them on and then securing them with three set screws: ![[Pasted image 20230705151929.png|grid]] Next, removed the dynodes: ![[Pasted image 20230705151949.png|grid]]![[Pasted image 20230705152114.png|grid]]![[Pasted image 20230705152202.png|grid]] After removing dynode 1: ![[Pasted image 20230705152332.png|grid]] Will need to remove some torrseal to get the ceramic out. Remove the stacked discs: ![[Pasted image 20230705154355.png|grid]] Loosen the set screw, then push the pin in: ![[Pasted image 20230705154700.png|grid]]![[Pasted image 20230705154729.png|grid]]![[Pasted image 20230705154744.png|grid]] Signs of arcing by the broken ceramic: ![[Pasted image 20230705155152.png|grid]] ![[Pasted image 20230705155438.png|grid]] Rotating the lead cone to access screws: ![[Pasted image 20230705162245.png|grid]]![[Pasted image 20230705162259.png|grid]] Removing the ceramic stack: ![[Pasted image 20230705164531.png|grid]]