Information for Shift Takers

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Counting house: 6000(*), 5503, 6666 | Run coordinator: 757-270-8916 | MCC: 7047(*), 7046, 7048 | Crew chief: 7045 | Guard house: 8522

Before the start of your shift: read and understand the Safety Documentation for this experiment.

  • You must then sign in the Yellow Binder in the Hall C Counting House!

Detailed instructions for Shift Takers are available on the How-to page. If you encounter problems, look first at those instructions for assistance.

Current Run Plans

Your Responsibilities

The tasks listed below are not set in stone, you should use your own judgement and initiative. You should assist other shift workers in their tasks as needed.

Shift Leader

  • Communicate clearly and effectively with shift crews and MCC (7047), and log any status information to the HCLOG
  • Follow the run plan and co-ordinate switching to the next experimental configuration with other shift workers and the MCC as required.
  • Maintain and update the Shift Summary detailing the events which occur while on shift
    • This is done by starting the summary as a log entry titled "X Shift Summary" where X = Day, Swing, Owl
    • Save & edit the summary after ANY event of interest occurs, including accesses
    • This provides the readers with an up-to-date play by play of the current shift
    • See example: https://logbooks.jlab.org/entry/3402742
  • Record the purpose for every single run in the "Run list" binders.
    • Use the new configuration sheets for the first set of runs on any new setting.
    • There are extra copies on the table in the middle of the counting house, if you run out the pdfs can be found here
  • Keep track of beam time accounting
  • Consult the daily run plans and communicate with the RC whenever problems happen that cannot be solved by shift workers.
  • Maintain data taking quality and an efficient use of beam time.

Target Operator

  • Watch the target, see Target Info
  • Start and stop the DAQ. Ensure the correct PS factors are being used.
    • Consult the run plan for estimated PS factors to be used for a given setting, adjust these up or down as needed
  • Carry out 50k replays for the HMS and SHMS
    • Compare 50k replay histograms with the sample ones and report to shift leader any unexplained differences. Hclog them.
  • Assist the shift leader and third person with their duties

Third person

  • Make certain that the Hall-C Alarm Handler process is running. See Hall_C_Alarm_Handler.
    • If there are any alarms being ignored or silenced, find out why and enter this in the logbook.
    • Log any alarms when they occur.
  • Carry out online analysis of the data, communicate results and any issues with the shift leader/experts as required.
    • For the Pion Electroproduction experiment analysis instructions see here.
    • For the VCS experiment, information for TO or SL can be found on [1] and detailed instructions for analysis shifts on [2].
  • Fill shift checklist once per shift.
    • An older Shift Checklist file, which also includes help for locating items, should be available here.

How To's: Instructions and How-to's for common problems

GMP How To's: You may find useful procedural information here since Hall A and C are similar.

Read-only Shift Schedule

Summer 2019 Shift Signup