201309 R1ProgressRep

09/04/13

Replaced 10 clean room filters

Tasks remaining:

1. Measure all Field and Sense wire tensions prior to potting
2. pot S2 & S3
3. install Windows on S2 & S3
4. install HVBs & STBs onto S2 & S3
5. burn in S2 & S3
6. finish Q&A on all chambers

David Coneff is managing two student workers and plans to finish the above remaining tasks before Jan 2014 as a part time worker, their work schedule is given below.

Mon	Tues	Wed	Thurs	Fri	Sat	Sun
1-5pm		1-5pm		1-5pm	11am-5pm

9/20/13

Q&A tasks remaining

1. discovered current draw beyond 20 uA when Sector 1 HV_SL1 board 7 voltage is raising to 500 volts. need to debug

The board drags a high current, all the boots were removed and the current is 15 uA for field, 12 uA for guard, and 1 um for sense as the applied voltage on them is 35V, 10V,50V successively.

1. replaced Sector 1 HV_SL1 board 4 due to a broken bus pin
2. continue burning in Sector 5
3. finish taking scope pictures of sense wire output on Sector 5
4. continue debugging TDC input cables

CLAS12_R1_Progress_Reports#September_2013