Shift Summary: Swing Shift Summary

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User name Sarah

Log entry time 00:11:02 on January 26, 2012

Entry number 250133

keyword=Shift Summary: Swing Shift Summary

Swing Shift Summary January 25, 2012

Shift Crew

Shift Leader: Sarah K. Phillips
Target: Arshak Asaturyan

Others for Special Tasks: Juan Carlos Cornejo (Compton DAQ)

Priorities for this shift

1. Continue C100 test (with DS-4% Al target at 50uA)
2. C100 test (with LH2 target at 180uA)
3. Take LH2 parity production data.

Highlights

We finished the C100 tests and went back to production running on LH2. Qtor tripped at 22:41, but we brought it back up and kept going. We had a little trouble at first with occasional spikes in the Compton scintillator rates, which MCC thought might be connected to the beam modulation, but that doesn't seem to be the case during a short observation (see HCLog 250125).

Notes for the Next Shift

If the rates on the Compton DAQ drop to 500 Hz, the DAQ is overloaded, so call Juan (his number is on the white board).
Watch for spikes in the rates in the Compton scintillator. If there are a lot of the them, try running without the beam modulation for a while and see if it makes a difference.
The C100 is on, so watch the energy widths (3c12X), and if you see double peaking, call Mark.

Run list

Run 15467: C100 test, DS-4% Al production @ 50uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
Run 15468: C100 test, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
Run 15469: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis).
Run 15470: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
Run 15471: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
Run 15472: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
Run 15473: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )

Coulombs acquired (estimate):

2.53 C

Key Operating parameters

(enter typical values, from EPICS or first 100k analysis)

Run 15472

I(uA): 177.5 uA
Halo 3 rate (Hz/uA): 20.8
MDALLBARS width (ppm): 224.6 ppm
BCM78-ddif width (ppm):62.3 ppm
A_q width (ppm): 404.8 ppm
MDALLBARS x-Pos sensitivity (ppm/mm): 701.8+-185.9
MDALLBARS y-Pos sensitivity (ppm/mm): 759.6+-196.3

Problems requiring attention

None.

Full list of events

16:00 - Shift starts. The IHWP had just been flipped to IHWP1=In, IHWP2=out. Called Hall B to let them know. When the beam comes back up, I'll run the flipper script.
16:30 - Flipper script run. Started Run 15467: C100 test, DS-4% Al production @ 50uA, IHWP1 IN, IHWP2 OUT (100k Analysis ).
16:43 - MCC called: They are done with 50 muA and want to go to 180muA. We request the target to be masked, and change to the LH2 target.
17:15 - MCC sends tune beam.
17:19 - MCC calls: going to 180 muA.
17:31 - 180 muA established, start Run 15468: C100 test, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis).
19:40 - MCC calls: they are going to send tune beam.
19:53 - MCC calls: they are going to send CW beam and try to ramp up to 180 muA.
19:59 - MCC calls: beam back to us now, and they have established 180 muA. Qtor is on, the detectors are all on, beam modulation is now on, the feedback seems to be running, and the halo rates and beam positions seem fine. So we are starting Run 15469: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis).
20:09 - The scintillator rates are jumping, so I call MCC. They are working on it.
20:15 - MCC calls: We've been having some trouble with the Compton scintillator getting huge in a vague pattern, and they think it is because of our beam modulation, so they would like us to turn it off for the night. I try to call Josh to talk to him about it, and then Jay calls to explain their reasoning. I talk to Mark about the issue, and while we are talking about it, the problem resolves itself (with the beam modulation still on. So, I am just going to leave it on for now. If we go back to having that problem, we'll try turning it off for a little while.
20:37 - Started having Compton scintillator rate problems again, so I turned off the beam modulation to see if that helps.
20:57 - Run 15470: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
21:29 - A spike in the scintillator rates!
21:55 - We call MCC and put our Compton detector in.
22:05 - Run 15471: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
22:12 - Turned the beam modulation back on, since it doesn't seem to have any effect on this issue. Talked to MCC about it, and they seem to agree with this course of action. We'll watch it for the next few hours.
22:29 - Over ambitious grad students may have restarted the Bmod behind our backs (Mark and I), so I don't know if the test was actually conclusive. Josh then emailed me back and said he restarted it at about 21:51.
22:41 - Qtor tripped.
22:50 -Qtor is back up, and we have started our running again.
22:50 - Run 15472: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )
23:46 - Run 15473: Parity, LH2 production @ 180uA, IHWP1 IN, IHWP2 OUT (100k Analysis )