4. To Do list, open items as of 10-Feb-06
\ Study threshold dependence on bunch length (Just changed Vrf to 4.5 MV)
4.5 MV running indicates very little sensitivity, if any
• Change LCW temperature in IR 2 (UW, CEF)
• Run QD4R chamber uncooled with low beam. Leak?? (MAC,tbd)
• Run with a warm NEG. Threshold?? (S.DeB, SE, MS)
√ Steer to minimize HOMs in VP3027. Threshold?? (JLT, done Saturday Feb 4)
No significant effect on spikes.
New items:
√ Redo some of the NEG heating expts.(MS, SE)
Done, have pressure profiles w/o 3027 pumps.
√ Inject gas into chamber to see effect on beam stability (AK).
Done & took data. Being moved to 3027.
\ Ask Ross & McCormick to look at the acoustic monitors.(UW)
Done, McCormick back Friday, Ross no answer.
\ Again, induce instability & transverse abort. Vacuum spike?
Done for LER, no spikes
√ Turn off VP3027
VP3027 has been removed.
• Check incoming absorbers for power difference before/after LER +25-m collimator (SDeB)
• Run vertically separated
• make large static orbit oscillations & look for vacuum activity
• Run with BaBar threshold raised by factor 100
• Can the HER fan hit "soft spots" and cause trouble?
\ Single beam HER running
Need to raise rf limit before this is meaningful
• More orbit issues? (FJD)
\ Checkout & tune up LER TFB
RCVR 2 has transient & Y-offset problem.
√ Do a systematic HER vs LER study
Done, see peplog
• Change temperature of 3027 absorber (SE, MS).
Need to focus on the components in LER Q4 and Q5 chamber (NEG, Absorber)