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Proto gun test chat

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Gerard Office or R3 (CERN)

Gerard Office or R3

CERN
Gerard Alain Tranquille (CERN), Gunn Khatri (CERN)
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Present:

Gerard, Jean, Gunn, James

 

Notes:

  • With latest injector schedule, we have 2 years to deliver 2 new e-gun fully tested (Sept. 2026)
  • Gun v4 (proto) is the only one that was built and tested on ECTS
  • v4 test resulted in good perveance, means electrode geometry is good (may need fine tuning)
  • However the low ceramic resistance due to high temperature of the ceramic is major limitation
  • Another weak point: ceramics are exposed directly to the hot cathode outgassing (saw coating of molybdeum, see indico:?)
  • Solution: adapt Russian design (present AD gun) for ceramics is out of the vacuum and away from the hot cathode
  • Jean made a concept design of gun v5
  • Before provide a "final concept design" to MME, we must test it. 
  • For the test purpose, no need to go through long CERN/MME production/aproval process
  • Cheap and fast outsourcing the ceramic (Kyocera or NTG) and electrodes (CNC24) - cost 10-15 kCHF, time 3 months
  • So if we order by end of september, we likely have it in Jan.2025, and tested by June 2025 (as compared to MME, where it can take 1 year)
  • In meantime we proceed tests with v4 that has increased distance of ceramic from cathode

 

Conclusion:

  • James agrees that the e-gun is the highest priority
  • Jean's help is needed in order to get 2D drawings of the electrodes
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