Photon Beam Commissioning Discussion Sept 17, 2014

Organization

• Time: 4:15 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)

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, Eugene, George, Sasha, Alexandre (JLab); Richard, James (UConn); Curtis (CMU); Todd (CASA); Pavel, George (RadCon).

Agenda

1. Announcements
   • Accelerator schedule delayed. Option A: Accelerator startup shifts from Sep 19 till Oct 9. Option B: Startup on Sep 30 for 4 GeV running, 10 GeV running starts Oct 20.
2. Moving microscope into Hall D (Richard)
   • Suggests that moving microscope into tagger hall occur at the earliest possible date.
   • (Sasha) moving into the tagger hall and testing there will simplify his setup. Only one crate with Flashes will be necessary for checking the system.
   • (Eugene) closing off access with the shielding wall will wait till close to the time for closeup of the hall, giving flexibility in when the microscope is moved.
   • (Elton) Tom mentioned that there will be considerable activity in the tagger hall and it may be wise to delay moving the (delicate) microscope into the tagger hall.
   • Discussion of details of when the microscope will move will continue during the run coordinator meeting tomorrow.
3. Accelerator and Hall D Interface Document - update
   • Waiting on feedback from accelerator on latest draft.
4. Update on Photon Commissioning (Alexandre)
   • Developing links to various procedures needed for the commissioning
   • Sasha has provided a procedure for trigger commissioning. The plan will be discussed Monday at the trigger meeting.
5. Beam Simulations
   • Richard: Simulation is ready to use. Todd has been away and start looking at the code for simulations.
6. RadCon update (Pavel)
   • EPICS database is being developed for accessing variables relevant to radiation control
   • Would like to access variables from the additional monitors. (Alexandre) Melvin is connecting the monitors and will make the measurements available via EPICS
   • General Beam parameters: It would be good to have access to various (important) variables to study correlation's. We need to develop this.
7. Beam parameters
   • From the request from Pavel, some discussion ensued related to how to access them for Hall D and other applications.
   • Todd: Draft comfort displays for Hall D have been developed by Michael. See examples of the Hall D and Hall B screens.
   • Hovanes will start developing a screen for Hall D based on the comfort screens from accelerator.
8. Other business