Difference between revisions of "Photon Beam Commissioning Discussion July 7, 2014"
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__TOC__ | __TOC__ | ||
== Organization == | == Organization == | ||
| − | * Time: | + | * Time: 4 pm EST |
* Connecting: detailed instructions are [[Tagged Beam Group Biweekly Meetings|here]] | * Connecting: detailed instructions are [[Tagged Beam Group Biweekly Meetings|here]] | ||
** H.323 ip address: 199.48.152.152 | ** H.323 ip address: 199.48.152.152 | ||
| Line 7: | Line 7: | ||
** phone: 408-740-7256 or 888-240-2560 | ** phone: 408-740-7256 or 888-240-2560 | ||
* Conference id: 536076821 | * Conference id: 536076821 | ||
| + | |||
| + | == References == | ||
| + | |||
| + | * [https://halldweb.jlab.org/hdops/wiki/index.php/Hall_D_Commissioning Hall D Commissioning Pages] | ||
== Agenda == | == Agenda == | ||
# Announcements | # Announcements | ||
| − | # | + | # Electron Commissioning (Todd/Mike) |
| − | + | # Photon Commissioning Draft (Eugene) | |
| − | + | # Goals for Aug 8 Review | |
| − | + | # Other business | |
| − | + | ||
| − | # | + | |
| − | # | + | |
| − | + | ||
| − | # | + | |
== Minutes == | == Minutes == | ||
| − | * Attending: | + | * 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) | ||
| + | # Photon Commissioning Draft (Eugene) | ||
| + | ## 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 | ||
| + | ##* 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. | ||
| + | # 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. | ||
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.
