Operator: clasie
The right WC tdc spectrum was still showing signs of contamination. Jim Kelsey requested an access to the hall to look at the problem at 10.20am and then another access at 1pm to install a valve downstream of where the gas supply line splits off to the left sector. The valve was adjusted to approximately half closed and there was no way in the time available to make sure there was equal flow to each sector. It is hoped that the extra flow to the right sector will clean out the contamination.
The He-3 bottle was installed on the unpol buffer system during the second hall access.
>From the beginning of the shift the Compton results showed an offset with +43.0% in one helicity state and -96.6% in the other. Taylan said that this could be fixed by either adjusting the beam position or the Compton calorimeter position. Between the times the hall was in access Bill Franklin worked with CCR to tune the beam and mostly fixed this problem. CCR also improved the lifetime. The lifetime had been drifting slowly down from 25min to 22min over the last 12 hours and after the tuning it was at 30min. Chris Tschalaer talked to CCR about increasing the injection current. It is now 170mA and the dump current was adjusted accordingly.
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