S. Ramberger, M. Schuh, G. DeMichele and P. Tirado

CCDTL

• Circuit model amoust complete, losses still have to be included
• Detailed presentation next meeting
• Measurements on the CCDTL planed

DTL

• High Power Test ongoing
  • Operating with 50Hz and 1.5ms pulses. Breakdowns observed (max P_CAV=170kW)
  • X-ray measurments done with the detector on the side and on beam axis at different powers (waiting for data)
  • Operating with 30Hz and 1.5ms pulses. Breakdowns observed (max P_CAV=180kW)
  • Until now the designed power (220kW, taking into account the 80% of the Q) has been reached up to 4% d.c. (20Hz, 2msec)
  • CW run with 24kW over weekend
    • Max temperature: 70°C for the end-cones
• At the L4 BCC-8 meeting, beam dynamics people presented their commissioning strategy which foresees for commissioning that the DTL tank1 is driven at up to 110% the nominal voltage however at a beam current close to 0. The feasibility needs to be checked.

HOM

• High frequency chopping causes a significant emittance growth, if Q_ex exeeds 10⁵. Only certain high frequency chopping patterns are foreseen in SPL operation and can be fixed. This would allow tuning the HOMs away from resonance lines with slight cavity design changes.

-- MarcelSchuh - 20-Nov-2009