Photon Beam Commissioning Discussion Sept 24, 2014

Organization

• Time: 4:00 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

• Estimate rates and ranges of parameters needed for the photon beam tuning (Todd for accelerator; Eugene, Alexandre for Hall D)
  • Need rates for profiler, start counter, ps
• Complete the tagger drawing with the expected configuration for the fall running, including all shielding. (Tim, Chuck, Elton)
• Screen of beam parameters for Hall D (Hovanes)
• Feedback on accelerator on latest ICD draft (Michael, Todd)

Agenda

1. Announcements
2. Accelerator and Hall D Interface Document - update
3. Update on Photon Commissioning (Alexandre)
4. Beam Simulations
5. RadCon update
6. Other business

Minutes

Attending: Elton, Alexandre, Hovanes, Tim, Eugene, Nathan (Hall D); Michael (Ops); Curtis (CMU); Richard (UConn)

1. Announcements
   • New accelerator schedule with likely close up of Hall D on Oct 10.
   • No meeting next week, just collaboration meeting.
2. Action items
   • Note see below for update from Richard on simulations
   • Drawing. Tim says there will be an update by the end of the week
3. Accelerator and Hall D Interface Document - update
4. Update on Photon Commissioning (Alexandre)
   • Alexandre has added a diagram with the schedule.
   • Comments and feedback were made to the new diagram
   • The trigger commissioning plan from Sasha needs to be folded in with this schedule.
5. Beam Simulations (Richard)
   • Submitted a job to simulate 1billion events to the OSG
   • No diamond radiator, replaced with 10 microns of Carbon
   • Boosted halo fraction to 1% (instead of 10^-5)
   • Made a box on the floor underneath the microscope to determine fluxes at the SiPMs
   • Added a matt 5x5m2 on the floor to determine fluxes
   • So far about 2/3 complete
   • Richard will report on this at the collaboration meeting
   • Richard also offered time on the OSG if Pavel would like to submit jobs using a build executable. Pavel may do this when it is ready
6. RadCon update (Pavel)
   • Setup of archiving of averages in progress
   • Need a list of EPICS variables from Alexandre and Hovanes.
   • Additional shielding is needed around be beam pipe inside the labyrinth. This may not be necessary for this run, but will avoid work in that area after a beam period. Tim said that Pavel can close the loop with Keith and Neil can probably complete the needed work.
7. Other business