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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)

20 40 60

2000

4000

6000

Press (nTorr)

VACP index (2=PR02-4112)

20 40 600

2000

4000

6000

Press (nTorr)

VACP index (2=PR02-4112)

BLM spikes around the Ring, PR02…PR08 09-Feb 10:33

PR02-2205

PR02-3072

HER-only abort

LER-only abort

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