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User name miham
Log entry time 00:01:18 on November18,2010
Entry number 340569
keyword=Swing Shift Summary (11/17/10)
Swing shift summary: Miha Mihovilovic (SL), Andrew Puckett (TO)
Simon Sirca (3rd)
===================================================================
EVENTS
------
16:00 At the beginning of the shift we were in Controlled access.
People were in the Hall, changing the configuration of the
experiment.
16:09 Julie Roche called and let us know, that she is moving
spectrometer to 40deg.
16:25 HRS-L is set to positive polarity. We are ramping up the
current in the magnets. Q2 and Q3 need to be cycled.
16:32 Everybody is out of the hall. We are going to Beam permit
16:40 Receiving tunne beam on empty target.
16:43 Asked MCC to set BPMs to the correct values. We also asked
for 5uA beam, on empty target
16:52 BPMs are where they should be: 0.0 in both directions.
Asked MCC to do the HARP scan.
17:00 Harp scan is done and results are within the specified
limits (0.2 +/- 0.1)
17:05 Masked the motion and moved the target to LH2 (Loop2)
17:11 Asked for 2uA beam, No raster. Started collecting data
First run that we have taken is #8842.
17:55 Per the request of the run coordinator, we increased
the J/T valve setting on loop 2 by two steps (2%) to
increase the reserve heater power to >50 W.
18:20 MCC called to let us know, that they did some Helicity
modifications to HallC. We let them know, that these changes
do not affect our data tonight, because we are taking
calibration data (elastics).
18:30 When doing replay experts realized that during the polarity
change they forgot to take Cherenkov out of the trigger.
Therefore we were collecting useless data i.e. run #8842 is
JUNK.
18:35 MCC did some more helicity changes for Hall-C.
18:38 Alex Camsonne came in to fix the trigger. Compton is being
turned on.
18:58 Trigger is changed. Started run #8843
20:00 Ready for new elastic setting. Momentum will be changed to
p=2.131GeV/c. First need to cycle Q2 and Q3 magnets. We
set the current on these two to 1600A.
20:16 HRS-L was moved to new angle of 37.858deg. Floor mark = 38.0
Vernier = 6.8
20:21 HRS-L successfuly set to new momentum p=2.131GeV/c.
20:25 Tried to start new run #8844, but coda crash. Had to
restart coda. Now it works. New run is #8845. Run #8844 is
JUNK!
21:35 The janitor who was vacuuming the floor in the middle-room
hit and detached two cables with the hose. These cables were
connected to the 200uA DC output on 10kHz DC Converter unit.
The two cables are labeled "Analog-output" and "NEMAL 10NS".
We quickly reconnected these two cables. We could not find
where these two cables lead and if they are vital or not.
This happened during run #8846.
21:56 Ended run #8846. Moving to new HRS-L setting: p = 2.245GeV/c
thetaL = 36.3deg. Magnets Q2 and Q3 are being cycled for the
new momentum setting.
22:07 HRS-L was moved to new angle of 36.3deg; Floor mark = 36.5;
Vernier mark = -3.6
22:10 HRS-L successfuly set to new momentum seting. Started taking
data again. New run is #8847.
22:16 MCC did some more helicity changes for Hall-C.
RUN LIST
===================================================================
Run Events BCM U3 D3 (C) Time Avg Curr Deadtime
-------------------------------------------------------------------
8842 - JUNK! (Wrong Trigger settings)
8843 222 k 0.00708 0.00781 61.6 mins 2.0136 uA 2.02%
8844 - JUNK! (Coda Crash)
8845 - Good run, but end-of-run file is missing
8846 116 k 0.00463 0.00508 38.2 mins 2.1156 uA 1.77%
8847 154 k 0.00672 0.00743 57.9 mins 2.0356 uA 2.15%
8848 - Passed to next shift
COMPTON RUN LIST
===================================================================
Run Events START STOP
-------------------------------------------------------------------
24065 651k 18:51 19:26
24066 381k 19:35 20:28
24067 215k 20:29 20:59
24068 272k 21:04 21:41
24069 213k 21:44 22:14
24070 433k 22:16 22:46
24071 1.4M 22:48 23:20
24072 1.8M 23:21 23:52
24073 / 23:53 Passed to next shift