Photon Beam Commissioning Discussion Aug 20, 2014

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Organization

  • Time: 4 pm EST
  • Connecting: detailed instructions are here
  • Conference id: 536076821

References

Action Items

  • Send Todd a geometry of tagger area, including the mapped tagger magnet field, for GEANT simulations (Richard). Richard is working to update the defined geometry based on a drawing received from Tim, Richard will add field map from Dan Sober
  • Estimate rates and ranges of parameters needed for the photon beam tuning (Todd for accelerator; Elton, Hovanes, Eugene, Alexandre for Hall D)
    • Need rates for profiler, start counter, ps
  • Richard will provide a "sacrificial" board with 30 SiPMs to register neutron damage during initial electron beam tune.
  • Hovanes is preparing photomultipliers that can be used to measure beam loss along the beamline.
  • Alexandre will meet with RadCon next week to coordinate details of accessing monitor information

Agenda

  1. Announcements
  2. Recommendations from ERR Report
  3. Aug 8 Photon Beam Commissioning Review Final Report
  4. ARR presentations
  5. Accelerator and Hall D Interface Document - needs to be finalized.
  6. Update on Photon Commissioning (Alexandre)
  7. Beam Simulations
  8. RadCon update
  9. Other business

Minutes

Attending: Elton, Eugene, Tim, Hovanes, Alexandre (Hall D); George, Pavel (RadCon); Michael (Ops); Todd (CASA); Curtis (CMU); Richard (Uconn).

  1. Announcements
    1. Accelerator Meeting
      • Eugene, Alexandre, Todd attended a meeting to discuss the upcoming running
      • This fall running at 500 MHz: 5.5 passes Hall D; 4 passes Hall A; 1 pass Hall B.
      • Accepted extension of first beam delivery by four days to accommodate initial photon beam commissioning before 6 day of shutdown.
      • Resume running after shutdown with delivery to other halls. Hall D retains priority for the next 3 weeks of operation
      • Beyond the 3 weeks, accelerator has a varied program but could deliver beam to Hall D on evenings and weekends.
      • Break at Thanksgiving, followed by other Accelerator programs with beam availability on evenings and weekends till Dec 22. Hall D would retain priority but if not running Hall A could receive 5 pass beam.
      • Beam delivery to Hall B for HPS will be during evenings and weekends to allow for CLAS12 installation during the day.
      • Briefly discussed spring running. No changes to nominal plan for 8 weeks of running.
  2. ARR presentations
  3. Tagger Hall Geometry
    • Richard, Elton and Chuck had a phone conference on Friday to review input to the simulation.
    • Most of the geometry was specified, but there remain some uncertainties especially related to shielding that has not yet been installed.
    • Chuck should update the layout in the tagger hall when he returns next week.
    • Discussion of "virtual" volumes to record particle fluxes.
    • Pavel: Suggest setup large planes along the wall and at the focal plane below the beamline.
    • Alexandre: Add detectors at the positions of the radiation detectors for comparison with measurements. See rad_mon_fall14.pdf
    • Richard has setup a page that describes the setup of the simulation at Beam Simulations
    • Output is in the form of PAW ntuples.
    • Final geometry will await precise determination of shielding to be installed in the hall. However, the present configuration should be valuable as a first step in determining radiation levels.
  4. Recommendations from ERR Report
  5. Aug 8 Photon Beam Commissioning Review Final Report
  6. Accelerator and Hall D Interface Document
    • Elton circulated an updated draft (v10) based on v9 from accelerator.
    • Feedback received from Michael, Tim and Hovanes. A new version (v11) will be based on Michaels edits, since they are the largest number.
    • Elton will circulate the updated version for additional comments.
  7. Update on Photon Commissioning (Alexandre and Eugene)
    • The plan is being flushed out and discussed in broad strokes.
    • Some feedback was given on the organization.
  8. RadCon update
    • RSAD is almost finalized. There was some discussion regarding the limit to 200 nA of cw beam. It was decided that this if fine for the fall running.
    • Tasks are being entered into the ATlist for parasitic measurements of radiation doses for different Hall D beam configurations.
  9. Other business
    • Next meeting in 2 weeks: Sep 3, 4 pm.
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