User name LeRose
Log entry time 00:01:18 on March 6,2006
Entry number 165412
Sunday March 5, 2006 swing shift
J. LeRose (SL)
G. M. Urciuoli (TO)
Program is take production data at 5 micro amps
Beam energy 1519 MeV
Note from previous shift:
observing: Time diff of helicity to nonhelicity times = 501.96949 seconds
In end of run is worrisome. They tried rebooting ROC 23 (see halog 165354)
17:10 beam off for target polarization measurement (39.6% Halog165364)
helicity time difference is still large (625) in run 2677. Bob Michaels is looking into it. See Halog 165365. We will reboot ROC23 again after the next run.
17:57 rebooted roc 23 also reset prescales ps1 3300, ps2 90
18:00 BB chambers tripped again
18:40 Beam 1/2 wave goes IN
21:08 beam off for target polarization measurement (40.7% halog 165398)
21:16 beam back
22:08 Bob Michaels calls in to say that he thinks the helicity difference issue is a false alarm. He sees no problem with the actual data. There's only a problem with the online vme code. See halog 165401. He suggests that others check his conclusion and says if time permits he will try to fix/debug the online vme code tomorrow.
23:55 ran QASY on run 2684 got essentially the same results as in the end of run log entry (Beam charge asymmetry ~100 ppm)
Run start/stop events/comments
2677 16:01/17:09 1M helicity time diff=625 (still not good)
2678 17:24/17:53 0.332 M stopped for HV trip BB chambers (S13)
rebooted ROC 23
2680 17:57 more junk need to reset prescales
2681 18:02/18:39 .357 M stopped for change of beam 1/2 wave plate from Out to IN. Helicity time difference is still large.
2682 18:41/19:54 1M Helicity time difference is good now!
2683 19:55/21:08 1M
2684 21:16/22:39 BB HV trip during run, N HV too. Stopped when we noticed the n-arm had tripped.
2685 22:39/23:46 1M
2686 22:50/ in progress at end of shift