Electron gun design meeting

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

376/1-020 (CERN)

Gunn Khatri (CERN)

Draft:

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

09:00 → 10:00 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