Electron gun design meeting

Thursday 22 May 2025, 09:00 → 10:00 Europe/Zurich

376/1-020 (CERN)

376/1-020

CERN

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Gunn Khatri (CERN)

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Present: William, Adriana, Emilien, Gunn, Carlotta, Teresa

Discussion:

Nicolas saw the Gun/COll Spec doc, he commented cooling water of gun if it is ON all the time
Cooling water stays ON all the time, it will be interlocked with High Voltage
Check Inconel - magnetic permeability and cathode poisoning
Teresa presented themal simulations
Ceramic brazing displacement with 250 deg C bakeout (use invar)
Bakeout - check with TE-VSC
Make 3 gun vacuum chambers, 2 with cooling water, one without cooling water for test stand

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- 1
  Discussion
  
  Jean's work on Jira ticket: https://its.cern.ch/jira/browse/BIXEI-588
  
  Speakers: Adriana Rossi (CERN), Carlotta Accettura (CERN), Emilien Rigutto (CERN), Gunn Khatri (CERN), Jean Cenede (CERN), Nicolas Sebastien Chritin (CERN), Teresa Guillen Hernandez (CERN), Mr Thibaut Coiffet (CERN), Thomas Demaziere (CERN), Vincent Maire, Vincent Sibue, William Andreazza (CERN)
  
  Simulations_Results22.05.2025.pdf
  
  Simulations_Results22.05.2025.pptx
  BI feedback on MME questions (Carlotta's notes-please check if ok):
  
  For the cycling, consider 4 cycle per year. The cathode stays hot for long time unlesss power cut. No concern if we lose the power (outgassing level do not overcome limit of having convection)- cooling is considered uniform
  
  Ok if the cathode get close during operation (~1mm)
  
  No problem for plasticity during the bake out because done on the stand, the gun is then measured and calibrated
  
  Cooling down from bake out very slow- no problem
  
  Stress in the ceramic during cooling down from bake out-check possibility to reduce the bake-out T