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Electron gun design meeting - silver plating discussion
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Europe/Zurich
156/R-002 (CERN)
156/R-002
CERN
Draft:
Present: Vincent M., Wilhelmus, Marc T., Emilien, Gunn
Discussion:
- The anode thermal reflectivity needs to be increased to keep anode temperature as cold as possible and send heat back to cathode.
- Simple mechanical or electropolishing of stainless steel should reflect 80% of heat, SIlver will reflect 98%
- But Silver coating or sputtering a bit challenging in terms of thickness or the inside vs outside anode tube (might be uneven)
- Additionally, silver plating needs underlayer of for example nickel or gold (both cathode poisoning and so is silver)
- With less than 10 um layer, the silver quantity is limited, so no risk of cathode sputtering/poisoning to the extend which impact operation
- At the present AD gun, the anode is silver plated and we see no adverse effect
- However Wil suggested that he will do some tests of reflectivity for different surfaces in his lab (polished, plated, coated etc)
- Vincent in mean time will proceed with the final drawings to not stop production with workshop, because silver plating is last step before installation
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