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Michigan B184 Update July 30, 2004 |
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1) Chambers passing CR test
a) Chambers passing CR test this week: EMS4A14, EML4C01, EMS5C14
EMS5C14 needs a more detailed data check. This chamber has had
applied epoxy to all endplugs between Al ring and endplug location
and the leak rates are 3.2 and 1.0 mbar/day for He at 3 bars.
This chamber also has problem of high dark current of over microA.
After cleaning three times with alcohol the dark current went back
to normal. As I reported before, I suspect that snoop was used on
some of the tubes (in 2002).
b) Total number of chamber passed CR test at CERN: 44
2) Chambers in progress
EMS4C08: Will be ready for CR test today
EMS4C14: Will be ready for CR test today, or next Monday
EMS4A16: Ready for dark current test
EMS5C10: Bottom multilayer has high dark current and we are dealing with it.
EMS5A04: Failed long term gas leak tightness. Recertify with helium.
3) Chambers in hospital - none
4) Problems and other issues
We no longer use the spreader bar to lift our chambers. We simply
use a very long sling (attached directly to the rotator frame) which
plays the same role as a spreader bar, and is as safe.
All contents from the shipment to bldg184 have arrived in bldg184.
We're now unloading everything and I have to stop here to deal with
this.
Zhengguo Zhao