Run Group A
Beam Time Accounting
If calling local numbers (with area code prefix 757) from the counting room dial 9+[last 7 digits]. To call other area codes dial 91+[10 digit number]
- 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, Fall 2018
Beam energy 10.6 GeV (5 pass)
Important: Document all your work in the logbook!
Remember to fill in the run list at the beginning and end of each run
RC: Stepan Stepanyan
- (757) 575-7540
- 9 575 7540 from Counting Room
PDL: Daniel S. Carman
- (757) 876-1789
- 9 876-1789 from Counting Room
- 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.
The integrated rates on the upstream counters have to be in the range 0-15 Hz (rates up 100 Hz are acceptable) and the rates on the midstream counters have to be in the range 10-20 Hz (acceptable up to 50 Hz) @50 nA. Counting rates in the range of hundreds of Hz may indicate bad beam tune or bleed-through from other Halls.
- Note 2: At the end of each run, follow the standard DAQ restart sequence
"end run", "cancel", "reset", then if the run ended correctly, "download", "prestart", "iocjscalerRestartAll.sh", "go". If the run did not end correctly or if any ROCs had to be rebooted, "configure", "download", "prestart", "iocjscalerRestartAll.sh", "go".
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: 2C24A (X=0.2 mm, Y=0.4 mm) , 2H01 (X=0.6 mm, Y=0.2 mm)
- Note 4: Do not turn OFF FTOF HVs, even during the beam tune with CW beam (turn off if tuned/pulsed beam in the upstream beamline)
- Note 5: In case of a Torus and/or Solenoid Fast Dump do the following:
- Notify MCC to request beam OFF and to drop Hall B status to Power Permit
- Call Engineering on-call
- Make separate log entry with copies to HBTORUS and HBSOLENOID logbooks. In the "Notify" field add Ruben Fair, Probir Goshal, Dave Kashy and email@example.com
- Notify Run Coordinator
- Turn off all detectors
- Note 6: When beam is being delivered to the Faraday Cup:
- the Fast Shut Down elements: Upstream, Midstream, Downstream, BOM, and Solenoid should always be in the state UNMASKED
- No changes to the FSD threshold should be made without RC or beamline expert approval
- Note 7: Any request for a special run or change of configuration has to be approved by the RC & documented
- Note 8: Carefully check the BTA every hour and run the script btaGet.py to print for you what HAS TO BE in BTA for this hour. Edit BTA if it is incorrect.
- Note 9: Reset CLAS12MON frequently to avoid histogram saturation.
- Note 10: Shift workers must check the occupancies! Use this tool to compare to previous runs: https://clas12mon.jlab.org/mon12/histograms/
- Note 11 Do not Turn OFF MVT HV: Instead go to 'Restore settings' from the MVT overview screen:
- SafeMode.snp for beam tuning and Moeller runs
- MV_HV_FullField.snp for full solenoid field
- MV_HV_MidField.snp wgeb solenoid < 4T
- NOTE 12 Check the vacuum periodically, make sure vacuum id not higher than 5e-5
- NOTE 13 Always reset the CFD threshold after all power off/on on the CFD crate
After the CAMAC crate 1 holding the CND CFD boards is switched off for any reason, it is mandatory to reset the associated thesholds typing the following command from any clon machine terminal:
>> $CODA/src/rol/Linux_x86_64/bin/cnd_cfd_thresh -w 0
(Updated: Oct. 22 2018 at 15:30)
Beam studies, hall is in controlled access till noon.
After hall is closed to beam permit, setup beam to the tagger yoke dump. Perform beam tune, then a Moller run with 1/2 plate IN (ask MCC to change it, current state is OUT), follow procedures;
Continue production data taking at 45 nA, full target at nominal DAQ setting.
Analysis of calibrated run 5215, with 1 ph.e. threshold in the trigger for HTCC, shows the same dips in the phi-distributions of electrons at certain thetas. So, looks like problem of dips is not related to the trigger thresholds. We will go back to nominal trigger condition (file trigger_v21_0.trg) with 2 ph.e. threshold for HTCC.
Mini-spin dance with Wien angle at 50 degrees (present setup), 25 degrees and 75 degrees will be diverted to later time (Wednesday or Thursday).
Shift Worker Notes:
In case of other questions or uncertainties of what to do, call the RC
Log screenshots of the following screens, and make sure at the moment you capture the screen the beam is ON
Epics on the web
Fall 2018 Run
Spring 2018 Run