Difference between revisions of "Photon Beam Commissioning Discussion July 7, 2014"
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##* Propose the following set for commissioning: (3x10^-5, 10^-4, 3x10^-4) | ##* Propose the following set for commissioning: (3x10^-5, 10^-4, 3x10^-4) | ||
# Photon Commissioning Draft (Eugene) | # Photon Commissioning Draft (Eugene) | ||
− | ## Discussion of [https:// | + | ## Discussion of [https://halldweb.jlab.org/hdops/wiki/index.php/Fall_2014_Commissioning_Plan draft plan submitted as homework to ERR] |
##* Eugene summarized the procedure and discussion of various items followed | ##* Eugene summarized the procedure and discussion of various items followed | ||
##* Update plan with radiators for commissioning | ##* Update plan with radiators for commissioning |
Latest revision as of 06:51, 1 April 2015
Contents
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
References
Agenda
- Announcements
- Electron Commissioning (Todd/Mike)
- Photon Commissioning Draft (Eugene)
- Goals for Aug 8 Review
- Other business
Minutes
- Attending: Elton, Eugene, Alexandre, Sasha (Hall D); Mike McCaughan, Todd Satogata (Accelerator); Richard (UConn); Curtis (CMU).
- Announcements
- Electron Commissioning (Todd/Mike)
- Mike detailing procedures for commissioning electron beam based on experience in April
- Much learned from beam delivery
- Confidence that delivery this fall will be clearner
- Expect: days to tune after spinning up to 5.5 pass; reasonable radiation without radiator
- Initial goal for emittance is 20 nm*rad x 2. [Design is 25 nm*rad in x and 10 nm*rad in y]
- Setup beam so that virtual focus of electron beam is at the collimator
- Need to characterize the ion chambers (minimizing scrapping and tails)
- nAmp bpms should be installed, but operation is not needed for commissioning
- Fast feedback is also not critical
- Simulation of beam environment
- Richard will provide a geometry for Todd to run simulations
- Richard will include the mapped tagger magnetic field
- Todd will provide a magnetic field for the quad immediately upstream of the tagger magnet.
- (Eugene) Suggest to have the quad off during initial commissioning.
- Check that RadCon detectors can be borrowed to measure rates in tagger hall and Hall D. Alexandre is working with Melvin Washington to arrange this.
- Radiators
- Production radiators are (10^-5, 3x10^-4, 10^-3)
- Propose the following set for commissioning: (3x10^-5, 10^-4, 3x10^-4)
- Mike detailing procedures for commissioning electron beam based on experience in April
- Photon Commissioning Draft (Eugene)
- Discussion of draft plan submitted as homework to ERR
- Eugene summarized the procedure and discussion of various items followed
- Update plan with radiators for commissioning
- Goal is to use cw at 50 nA, but have a backup plan in case tune beam is needed
- Likely use 5 mm collimator hole instead of 3.4 mm. (Can active collimator be mounted on either hole?)
- Use photon profiler to initially determine position of beam on face of collimator
- Scan photon beam with correctors immediately upstream of tagger magnet to determine/verify sensitivity of position to current in correctors
- Possibly move profiler to location near the target. This would require a location with known position (surveyed) relative to target/beamline.
- Use active collimator to verify that photon beam is centered on collimator hole. (Richard) This should be able to done even before active collimator is calibrated.
- Discussion of fabricating a small calorimeter detector, as backup, to sit behind one of the collimator holes to check amount of beam passing through the hole.
- (Sasha) During initial beam position calibrations, have the secondary collimator inserted to minimize scrapping background in the hall.
- Rapid access system to be installed in Hall D. Need to make sure that the system is being implemented.
- Discussion of draft plan submitted as homework to ERR
- Goals for Aug 8 Review
- Organize as an unofficial review of beamline procedures
- Invite Mike Spata and Brian Freeman from accelerator and Stepan Stepanyan (or Andi Sandorfi) from Hall B to be reviewers
- Talks: photon beam production and characteristics (Richard); electron beam commissioning (Todd); photon beam commissioning (Alexandre?); do we need one on controls? radcon?
- Pre-brief materials: Beam specifications; Hall D / accelerator coordination documents; electron beam commissioning procedures; photon beam commissioning procedures; draft sequence of commissioning
- Other business
- Next meeting next week Jul 16 at 4 pm.