Photon Beam Commissioning Discussion Aug 20, 2014

Organization

• Time: 4 pm EST
• Connecting: detailed instructions are here
  • H.323 ip address: 199.48.152.152
  • web browser: https://bluejeans.com/536076821
  • phone: 408-740-7256 or 888-240-2560
• Conference id: 536076821

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