Log entry time 00:07:51 on May 07, 2012

Entry number 382803

Swing Shift Summary

Summary

At the start of the shift, James was finishing up a target anneal. He then polarized our target. We jumped right into production running after a quick check of the beam positions. We did production running for the rest of the shift.

James thinks that the target was underperforming during this shift. See halog 382779 for an entry by James on the target polarization.

Timeline

• 16:00 - Shift started with no beam, as James is doing a target anneal. He plans to be done soon, so I start getting ready to resume production running by having the IHWP flipped to OUT.
• 16:50 - The target is polarized and we are asking for 50 nA. We are going to production running! We will ask for beam, start a production run, check the beam positions, and do spot_L plots. If things look good, we will keep going with production, otherwise we will do the whole beam centering program.
• 17:00 - Things look good, so we are going to keep going on our production running.
• 17:20 - Two runs got mislabeled in the chaos of getting started. Runs 24459 and 5752 are production runs, not tungsten calibration runs like their headers proclaim.
• 18:18 - The beam has been somewhat unstable for the last 5 minutes or so. It looks like they are having trouble getting Hall C up to high current.
• 18:24 - It looks like they are still having troubles with Hall C. Our beam positions are wandering somewhat, and so is the beam energy.
• 18:36 - The beam has been a little unstable (tripping off, and the beam positions wandering somewhat) while MCC has been attempting to bring Hall C up to high current for the last 20 minutes. I made a halog entry about it (halog 382736).
• 18:37 - DAQ issues for the right arm. We got a student in here to help us restart CODA (about 8 minutes, but it was mostly during a beam trip).
• 21:08 - I did an estimate of where we are, since we haven't been at the optimal 75% target polarization that the run sheet was calculated for. I put my estimate in halog 382766.
• 22:09 - James calls. He thinks that the target polarization is dropping more than he thought, and thinks that maybe we should switch to the bottom target during the next set of dilution runs. We have a way to go before we change momentum settings, so we'll stay where we are for now. See halog 382779 for an entry by James on the target polarization.
• 24:00 - End of shift! Production running!

Notes for the next shift:

• Keep an eye on the energy; the value was wandering a little earlier.
• We didn't do a bleed-through measurement, since Hall C wasn't on most of the swing shift, so it is up to the owl shift to make up for it!
• Hall C is now in control of the IHWP, so keep track of when they flip it. Ideally, you want an ihwp flip about halfway through each point. If they don't flip it for some reason, make sure that you do.
• Do a dilution run for each point
• Do 2/3 with the right arm before moving to the next point.
• Keep an eye on the beam current so it doesn't drift down to 40 nA. Keep and eye on the beam positions too.
• If MCC cannot deliver beam due to an FSD on the Moller target when you know the target is out, ask them to reboot the IOC.

Runs Taken

• Run 5752 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M (did spot_L checks during this run.)
• Run 5753 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5754 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5755 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M (beam unstable at end of this run.)
• Run 5756 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M (beam unstable at start of this run.)
• Run 5757 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5758 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5759 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5760 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5761 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5762 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5763 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5764 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5765 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5766 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5767 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5768 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5769 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
• Run 5770 (p0=2.0497 GeV/c, NH3 top, out) - running

• Run 24459 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24460 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24461 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24462 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M (beam unstable at end of this run.)
• Run 24463 (p0=1.5961 GeV/c, NH3 top, out) - CODA Crash
• Run 24464 (p0=1.5961 GeV/c, NH3 top, out) - 3.2 M (beam unstable at start of this run.)
• Run 24465 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24466 (p0=1.5961 GeV/c, NH3 top, out) - 5.0 M
• Run 24467 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24468 (p0=1.5961 GeV/c, NH3 top, out) - 4.8 M
• Run 24469 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24470 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24471 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24472 (p0=1.5961 GeV/c, NH3 top, out) - 5.0 M
• Run 24473 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24474 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24475 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24476 (p0=1.5961 GeV/c, NH3 top, out) - 4.9 M
• Run 24477 (p0=1.5961 GeV/c, NH3 top, out) - 4.8 M
• Run 24478 (p0=1.5961 GeV/c, NH3 top, out) - running