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Michigan B184 Update November 12, 2004 |
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1) Chambers re-working
a) Total number of chambers need to be reworked: 30
b) Total number of chambers that have been re-worked: 26
c) Chambers re-worked this week: EML3C05, EML4A03,
EMLS5A10, EMS4C06, EML4A15, EML3C11, EML4C03
2) Chambers in progress
EMS3A10, EMS3A12: Chamber passed CR test (from leak rate
certification, painting epoxy to cr test)
EMS3C04: Taking CR data
EMS3C08: Re-taking CR data
EMS3A14: Re-taking CR data
EMS3A02: Leak certified and will finish epoxy painting today
EMS3C12: Ready for CR test today
3) Problems and other issues
a. The 4th DAQ system had some problems these a couple of days. Jeff
has been working on it.
b. Twice operations forgot to apply HV when the chamber test should
have HV on. Once the gas input to a chamber only had AR.
Since we are working for over 8 chambers in parellel, we do need to
be more caution for each steps we did, and try to avoid making
mistatkes which waste our time.
c. For the final mezz cards provided to us, we found that we have to
replace about 1 per chamber (1 out of 16). Of course this sometimes
means we must redo the CR test.
d. On average, CR data show that UW chambers have one hot tube per
chamber. These tubes can be treated by applying -HV.
It becoming cold here at CERN. This is particularly true when the
gate of bldg184 has to be opened for transporting chambers. however,
unlike in Michigan, the land around is still covered by green grass.
Zhengguo Zhao