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User name X.Deng/D.Wang
Log entry time 07:59:17 on October 24, 2009
Entry number 296419
keyword=PVDIS BCM test runs
Goal: to see if different paths of bcms (u1,u3,d1,d3) have an side effect on bad correlations of
How: exchange bcm u3, d1, d3 with bcm u1 before signals going to V2F in middle room
counting house. Beam current @100uA
run 13574 keep everything unchanged as usual
run 13575 exchange signal bcm d1 with bcm u1
run 13578 exchange signal bcm u3 with bcm u1
run 13579 exchange signal bcm d3 with bcm u1
1) From run 13574, found pvdis bcm u3 in both arms are perfectly correlated with
happex bcm 1. Right arm pvdis bcm u3 used to have bad correlation with happex bcm 1. This
improvement may be due to the access work done Oct 21st. Refer to halog number 296045.
2) The bad correlation of pvdis bcm d1 in both arms are due to bad path. So is bcm d3
in right arm.
Will update more information in PVDIS log soon.
A copy of this log entry has been emailed to: xiaochao, rom, rsubedi, dwang, pkpan, deng