Make New Entry, Make Followup Entry
User name Yi Qiang
Log entry time 12:01:46 on November 09, 2008
Entry number 247755
This entry is a followup to: 247744
keyword=A huge drop of left VDC effiencicySince run 3108, the lower side of U1 and V1 dropped to about 80% as seen in Chen's halog. However, the decreas of the wire hits are spotted in U1 and U2. Nothing got changed except for stopping/starting a Happex run. Checked High Voltage and Gas flow, all of them seem OK. Beam current, BPM are also fine. The dip of the low efficiency seems moving from low end to high end now, see latest replay from run 3110. Maybe the delay effect of the gas change early this morning?????
Run# 3107
Run# 3109
Run# 3110
