Photon Beam Commissioning Internal Review August 8, 2014

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Attending: Javier Gomez (Physics); Elton Smith, Alexandre Deur, Hovanes Egiyan, Eugene Chudakov (Hall D); Richard Jones (GlueX); George, Pavel Degtiarenko (RadCon); Michael McCaughn (Ops); Todd Satogata (CASA) Reviewers: Stepan Stepanyan (Hall B, chair); Mike Spata (CASA); Brian Freeman (Operations)

Notes by Elton

According to speaker

  1. Richard
    1. Monitor of circular polarization to verify it is less than 1%?
    2. Is the helicity signal delivered to Hall D?
    3. Are the stated goals for commissioning (slide 16) included in our plan?
  2. Michael
    1. Extend 6" pipe from tagger vacuum box beyond dump wall?
    2. Mike: 1) Consider beam tuning at the lowest (reliable) current. 2) Spot checks: turn beam off to inspect viewer data. 3) Unmask ion chambers during tuning after they are calibrated
    3. Add NMR readback to tagger setting procedure
    4. Slide 37: aperture of active collimator is 5 mm
    5. Schedule: Startup Sep 19; complete commissioning to dump by Oct 3
  3. Pavel
    1. Are all RadCon commissioning points included in either the electron or photon commissioning plans?
  4. Alexandre
    1. Mike: Add BCM upstream of Hall D dump into the beam loss accounting system (BLM)?
    2. During electron tuning: Check beam movement on dump viewer when tagger quad is energized. This may require an iteration of electron beam tuning and beam adjustment after photon beam tuning.
    3. Add column to table in p 11 to indicate what part of commissioning requires it
    4. Make p 12 into a table -> may be useful for guidance during commissioning
    5. Mike: Suggest that Hall D personnel participate in electron commissioning (as observers)
    6. p. 16: Before x-scale scan is performed, adjust diff in active collimator y to zero (i.e. center vertically)
    7. Todd: Range of corrector currents can cover 5x desired range in position on collimator
    8. p. 18: After controlled access - recheck electron orbits and rates in PS
    9. Stepan: Could locate extra profile monitor (in his office) at beam dump
    10. p. 19: see note from p. 18
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