Difference between revisions of "Run Group A"
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* Make sure the hydrogen target is empty. | * Make sure the hydrogen target is empty. | ||
* Ramp the torus to 75% field (negatives intending/positive polarity); Ramp the solenoid to 100% field (positive polarity) | * Ramp the torus to 75% field (negatives intending/positive polarity); Ramp the solenoid to 100% field (positive polarity) | ||
| − | * Prepare for beam | + | * Prepare for tuning using a 5 nA beam to the tagger yoke: SVT (contact expert to do it), MVT, CND, CTOF, FTT, HTCC, DC, FTOF should be off, tagger magnet should be on. Follow the instructions in the "Establish-physics quality beam" procedure at [https://wiki.jlab.org/clas12-run/images/e/e3/Estab_beam.pdf]. Compare harp scan to the ones performed for KPP at [https://logbooks.jlab.org/entry/3455743 2C21] and [https://logbooks.jlab.org/entry/3455744 2C24]. Consult with the beamline expert in case of issues. |
| − | * If beam profiles at the tagger are acceptable, move to beam tuning to the Faraday Cup. Again, refer to the instructions in the "Establish-physics quality beam" procedure at [https://wiki.jlab.org/clas12-run/images/e/e3/Estab_beam.pdf]. Compare harp scan with one performed for KPP at [https://logbooks.jlab.org/entry/3455750 2H01]. | + | * If beam profiles at the tagger are acceptable, move to beam tuning to the Faraday Cup with a 5 nA beam. Again, refer to the instructions in the "Establish-physics quality beam" procedure at [https://wiki.jlab.org/clas12-run/images/e/e3/Estab_beam.pdf]. Compare harp scan with one performed for KPP at [https://logbooks.jlab.org/entry/3455750 2H01]. |
| − | * Once beam to Faraday Cup is established, prepare to start data taking. Switch on all detectors; contact expert to switch on SVT. | + | * Once beam to Faraday Cup is established, prepare to start data taking. Switch on all detectors with 5 nA beam; contact expert to switch on SVT. |
| − | * Start up DAQ at 5 nA and | + | * Start up DAQ using PROD/elec6_htcc_1phe_pcal_150.trg at 5 nA and raise beam current up to 50 nA. Stop if there are rate/current issues in the detectors. |
| + | * Take empty target data using PROD/elec6_htcc_1phe_pcal_150.trg. Take 6 hours of data starting a new run every 2 hours. | ||
* Turn the beam off and fill hydrogen target | * Turn the beam off and fill hydrogen target | ||
* Turn on beam at 5 nA and turn up to 30 nA. Put pictures of beamline scalers and detector rate/current screens in the logbook. | * Turn on beam at 5 nA and turn up to 30 nA. Put pictures of beamline scalers and detector rate/current screens in the logbook. | ||
| − | * Take data at 30 nA with PROD/ | + | * Take a series of short data runs to optimize the pre-scale factors for the FT trigger. |
| + | * Take data at 30 nA with PROD/elec6_htcc_1phe_pcal_150.trg. Two shifts of data taking in this configuration. | ||
* Hall B work for Monday: | * Hall B work for Monday: | ||
Revision as of 16:50, 5 February 2018
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Shift ScheduleShift ChecklistHot CheckoutBeam Time Accounting |
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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.
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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 2/5 - 13:00) 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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