Difference between revisions of "Run Group A"
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** At the current setting for production, put pictures of the beamline scalers and detector rate/current screens in the logbook. | ** At the current setting for production, put pictures of the beamline scalers and detector rate/current screens in the logbook. | ||
** Take a series of short data runs to optimize the pre-scale factors for the FT trigger. Contact the FT expert for this optimization. | ** Take a series of short data runs to optimize the pre-scale factors for the FT trigger. Contact the FT expert for this optimization. | ||
| − | * Take data at | + | * Take data at 15 nA with PROD/elec_6gev_htcc_1phe_pcal_150.trg. Take two shifts of data in this configuration starting a new run every 2 hours. |
| + | * Complete a calibration of the beam blocker transmission Rafayel P. will lead this effort. | ||
| + | * Reduce the torus field to 75% (negatives inbending, positive polarity) | ||
| + | * Take data at 15 nA with PROD/elec_6gev_htcc_1phe_pcal_150.trg. Take two shifts of data in this configuration starting a new run every 2 hours. | ||
<!-- == <font color=blue>''' Beam Tuning:'''</font>== | <!-- == <font color=blue>''' Beam Tuning:'''</font>== | ||
Revision as of 15:09, 6 February 2018
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- Note, all non-JLab numbers must be dialed with an area code. When calling from a counting-house landline, dial "9" first.
- To call JLab phones from outside the lab, all 4-digit numbers must be preceded by 757-269
- Click Here to edit Phone Numbers. Note, you then also have to edit the current page to force a refresh.
Click Here to edit Phone Numbers. Note, you then also have to edit this page to force a refresh.
CLAS12 Run Group A, Winter 2018
Beam energy 6.4 GeV (3 pass)
Important: Document all your work in the logbook!
Remember to fill in the run list at the beginning and end of each run (clas12run@gmail.com can fill the run list)
RC: Daniel S. Carman
- (757) 575-7540
- 9 575 7540 from Counting Room
- carman@jlab.org
PDL: Eugene Pasyuk
- (757) 876-1789
- 9 876-1789 from Counting Room
- pasyuk@jlab.org
- Note 1: Be very mindful of the background rates in the halo counters, rates in the detectors, and currents in the SVT for all settings to ensure that they are at safe levels.
- Note 2: At the end of each run, follow the DAQ restart sequence "end run", "abort", "reset", "download", "prestart", "go". After DAQ prestart is complete reboot the scaler IOCs with the command: iocjscalerRestartAll.sh. Note: After each step, make sure it is complete in the Run Control message window. If a roc has crashed, find which one it is and issue a roc_reboot command and try again. Contact the DAQ expert if there are any questions.
- Note 3: Nominal beam positions: 2C21 (X=0.0 mm, Y=0.0 mm), 2C24 (X=0.0 mm, Y=0.7 mm), 2H01 (X=0.3 mm, Y=-0.6 mm)
- Note 4: With beam to the Faraday Cup, typical rates an all halo counters upstream from the target should be either 0 or of the order of few counts. Count rates in the range of tens or more may indicate bad beam tune or bleed-through from other Halls.
Run Plan:(last update 2/6 - 08:30) The beam position should be as indicated above. Make sure FSD thresholds are set correctly for whatever current is selected (refer to instructions in the "Establish-physics quality beam" procedure at [1]), integration time is set to 5 ms, and that the orbit locks are on.
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