CORNELL LABORATORY FOR ACCELERATOR-BASED SCIENCES AND EDUCATION

Working Group 1 (Guns/Cathodes)

Agenda

Charge

1. Gun technology: DC, NCRF, SCRF, hybrids
   1. status reports from JLab, Cornell, BNL/AES, Daresbury, JAEA/KEK, Rossendorf, LANL, BINP, ...
   2. update the gun table: advantage, disadvantages, state-of-the-art, milestones since ERL07, expected required level of continued R&D
2. Beam dynamics, emittance preservation techniques:
   1. laser pulse shaping techniques
   2. bunch compression techniques
   3. beam manipulation techniques
3. Technological challenges:
   1. vacuum
   2. field emission
   3. load locked designs
   4. ceramic insulators
   5. HV breakdown
   6. HV power supplies and SF6 tank
   7. photocathode cooling
   8. ion backbombardment and photocathode degradation
   9. cathode survivability in the RF environment
   10. compatibility of various cathode types with cryogenic temperatures (for SRF guns)
   11. RF power couplers
4. Photocathodes and Lasers:
   1. Update photocathode table: pros/cons, identify appropriate laser wavelength, IR vs Green vs UV, measured QE, necessary laser power for 100mA beam, response time,
   2. Update drive laser table for each photocathode: max available power, approx. cost and complexity, pulse forming mechanism, pulsewidth, etc
5. Injector Designs, benchmarking codes:
   1. status of efforts to benchmark codes
6. Beam diagnostics at the injector:
   1. emittance, bunch length, beam current, HV ripple, stability ...
   2. timing