Swing Shift Summary

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User name Sarah

Log entry time 00:08:38 on May 06, 2012

Entry number 382527

keyword=Swing Shift Summary

Swing Shift Summary

Leader: Sarah Phillips
Target: Min Huang
Third: Haiyan Gao

Summary

The shift started with the hall in restricted access and with Jack working on the big bite power supply. He ramped up the septa and checked them out. Then we went back to production running until the end of the shift, when a problem in one of the arcs ended beam delivery.

Timeline

16:00 - Shift starts with no beam; still recovering from the broken water lines to the big bite power supply from last night. Jack, Dustin and Alex are all in the hall working. Jack is testing the power supply and ramping the right septum magnet.
16:15 - Dustin called from the hall. The majority of the water lines on the big bite power supply have been replaced, although there are still some older ones remaining. The right septum magnet has been tested to 900 A and then to 950 A briefly, and things looked good and didn't overheat. We'll run at no higher than 800 A for now. Once everyone is out of the hall, we will go to beam permit and try to get back into production running.
16:22 - Starting to sweep the hall to go to beam permit.
16:32 - Septa ramped up and ready to go.
17:12 - Sweep completed. Alex goes into the hall on a controlled access to change out a gas bottle for his test.
17:39 - Alex is out of the hall, so we are going to power permit.
17:43 - Beam permit! MCC about to start tuning the beam into the hall: target at "home" position, turning off slow raster, MCC turning off fast raster, ready to tune the beam into the hall.
17:50 - The tune looks okay, so they are sending CW to try that out.
17:57 - Beam looks okay, so we are going to the carbon hole target. We are also turning on the fast raster to 1.5 by 1.5 mm (the fast raster is still off).
18:03 - Requested 50 nA. We found that there are two different g2p beam recovery plans that say rather different things in the shift worker instructions on the g2p wiki (titled "How to recover the beam after an extended (>4 hour) down: G2p-beam-recovery" and "How to recover BPM positions after a long beam trip or tune change" --- someone needs to look into this! I've marked it obnoxiously in the wiki.). We decided to use the one with the slow raster on and the fast raster off, so we switch to that at 18:10 and do a spot++.
18:17 - Going to carbon target, and changing the slow raster size again.
18:18 - requested 10 nA Things look okay.
18:29 - requested 50 nA with fast raster. Things look okay.
18:32 - requested beam off to move to the top NH3 target and to polarize it.
18:41 - requested 50 nA. Starting to take production data. Yay!
20:17 - Flipped the IHWP to OUT.
21:30 - Finished the left arm momentum setting of 2.2279. Hooray! Resetting the left to 2.0497. Taking data on the right arm while doing that (run 24417).
23:32 - The beam has been off for about 10 minutes, so I call MCC for an update. They say there is a problem in one of the arcs, and they have paged the experts. They expect it to be about 30 minutes more. So, we stopped runs 24423 and 5710.

Notes for the next shift:

We haven't done the dilution runs for the new left arm momentum setting yet! We were waiting until the right finished, so don't forget to do them.
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.
Flip ihwp about halfway through each point.
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.

Runs Taken

Beam Position Studies:

Run 5690: Spot++,target=Carbon hole, beam position check
Run 5691: Spot++,target=Carbon hole, beam position check
Run 5692: Spot++,target=Carbon, raster size check
Run 5693: Spot++,target=Carbon, raster size check
Run 5694: Spot++,target=Carbon, raster size check
Run 5695: Spot++,target=Carbon, raster size check
Run 24407: Spot++,target=Carbon, cosmics

Production:
Left

Run 5696 (p0=2.2279 GeV/c, NH3 top, in) - 7.0 M
Run 5697 (p0=2.2279 GeV/c, NH3 top, in) - 7.0 M
Run 5698 (p0=2.2279 GeV/c, NH3 top, in) - 7.0 M
Run 5699 (p0=2.2279 GeV/c, NH3 top, in) - 7.0 M
Run 5700 (p0=2.2279 GeV/c, NH3 top, in) - 7.0 M
Run 5701 (p0=2.2279 GeV/c, NH3 top, out) - 7.0 M
Run 5702 (p0=2.2279 GeV/c, NH3 top, out) - 7.0 M
Run 5703 (p0=2.2279 GeV/c, NH3 top, out) - 7.0 M
Run 5704 (p0=2.2279 GeV/c, NH3 top, out) - 7.0 M

Total this shift: 63 M (this completes our first left arm point with 177.5 M events, accounting for a target polarization of 72%)

Run 5705 (p0=2.0497 GeV/c, NH3 top, out) - JUNK
Run 5706 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
Run 5707 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
Run 5708 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
Run 5709 (p0=2.0497 GeV/c, NH3 top, out) - 7.0 M
Run 5710 (p0=2.0497 GeV/c, NH3 top, out) - 4.0 M

Total in this shift: 32 M
Total in all: 32 M of 382 M

Right

Run 24408 (p0=1.7348 GeV/c, NH3 top, in) - 5.0 M
Run 24409 (p0=1.7348 GeV/c, NH3 top, in) - 4.9 M
Run 24410 (p0=1.7348 GeV/c, NH3 top, in) - 5.0 M
Run 24411 (p0=1.7348 GeV/c, NH3 top, in) - 4.9 M
Run 24412 (p0=1.7348 GeV/c, NH3 top, in) - 4.8 M
Run 24413 (p0=1.7348 GeV/c, NH3 top, out) - 5.1 M
Run 24414 (p0=1.7348 GeV/c, NH3 top, out) - 4.9 M
Run 24415 (p0=1.7348 GeV/c, NH3 top, out) - 4.9 M
Run 24416 (p0=1.7348 GeV/c, NH3 top, out) - 4.8 M
Run 24417 (p0=1.7348 GeV/c, NH3 top, out) - 1.7 M (taken during left arm change)
Run 24418 (p0=1.7348 GeV/c, NH3 top, out) - 0.5 M
Run 24419 (p0=1.7348 GeV/c, NH3 top, out) - 5.1 M
Run 24420 (p0=1.7348 GeV/c, NH3 top, out) - 5.2 M
Run 24421 (p0=1.7348 GeV/c, NH3 top, out) - 5.2 M
Run 24422 (p0=1.7348 GeV/c, NH3 top, out) - 5.3 M
Run 24423 (p0=1.7348 GeV/c, NH3 top, out) - 3.0 M (ended early due to problem in arc)

Total on this shift: 70.3 M
Total: 153 M of 206 (206 is 2/3 of the 310 M we want for this setting)