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Michigan B184 Update September 17, 2004 |
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1) Chambers passing CR test
a) Chambers passing CR test this week: EML5A03, EML5A05, EML4C15
b) Total number of chambers passing CR test at CERN: 61
2) Chambers in progress
EML5A01: Ready for CR data taking
EML4C05: CR data show a hot tube and we are dealing with this tube
with -HV. The dark current of this sublayer was only 250 nA, well
below ATLAS specification. And the nearby sublayer have dark
current around 240 and 260 nA. However, we do find this tube has
dark current of ~90na.
EMS5A14: Applied epoxy to AL and endplug location for some sector
and tubes. Will measure leak rate over weekend.
3) Chambers in hospital.
EMS5C02: After cleaning with distilled water and alcohol a few
times, the dark current is below ATLAS specs. However, one sector
is still higher than the neearby sectors and we want to clean this
sector once more. Then move ahead.
4) Problems and other issues
a) We will soon work with the 14 chambers that have been integrated
at UM. We need to replace all mezz cards and mother boards. Claudio
will make sure that we have the mother boards to replace. Capacitors
are needed to replace the ones on these mother boards.
b) Some cables on EML5 (the first 3) are slightly short, we need to
remake them. Hopefully the others will be fine, otherwise we need quit
some cables sicne EML5 chambers are long.
c) Steven received Al strips from Helmut. We will pick them up
soon. thanks, Helmut.
Zhengguo Zhao