Difference between revisions of "Photon Beam Commissioning Discussion July 7, 2014"

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##* Todd will provide a magnetic field for the quad immediately upstream of the tagger magnet.
 
##* 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.
 
##* (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 .
 
## Radiators
 
## Radiators
 
##* Production radiators are (10^-5, 3x10^-4, 10^-3)
 
##* Production radiators are (10^-5, 3x10^-4, 10^-3)
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# Photon Commissioning Draft (Eugene)
 
# Photon Commissioning Draft (Eugene)
 
## Discussion of [https://hdops.jlab.org/wiki/index.php/Fall_2014_Commissioning_Plan draft plan submitted as homework to ERR]
 
## Discussion of [https://hdops.jlab.org/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
 
# Goals for Aug 8 Review
 
# Goals for Aug 8 Review
 
# Other business
 
# Other business

Revision as of 09:31, 10 July 2014

Organization

  • Time: 4 pm EST
  • Connecting: detailed instructions are here
  • Conference id: 536076821

References

Agenda

  1. Announcements
  2. Electron Commissioning (Todd/Mike)
  3. Photon Commissioning Draft (Eugene)
  4. Goals for Aug 8 Review
  5. Other business

Minutes

  • Attending: Elton, Eugene, Alexandre, Sasha (Hall D); Mike McCaughan, Todd Satogata (Accelerator); Richard (UConn); Curtis (CMU).
  1. Announcements
  2. Electron Commissioning (Todd/Mike)
    1. 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
    2. 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 .
    3. Radiators
      • Production radiators are (10^-5, 3x10^-4, 10^-3)
      • Propose the following set for commissioning: (3x10^-5, 10^-4, 3x10^-4)
  3. Photon Commissioning Draft (Eugene)
    1. 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
  4. Goals for Aug 8 Review
  5. Other business
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