Photon Beam Commissioning Internal Review August 8, 2014
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Contents
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 (logged by speaker) by Elton
- Richard
- Monitor of circular polarization to verify it is less than 1%?
- Is the helicity signal delivered to Hall D?
- Are the stated goals for commissioning (slide 16) included in our plan?
- Michael
- Extend 6" pipe from tagger vacuum box beyond dump wall?
- 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
- Add NMR readback to tagger setting procedure
- Slide 37: aperture of active collimator is 5 mm
- Schedule: Startup Sep 19; complete commissioning to dump by Oct 3
- Pavel
- Are all RadCon commissioning points included in either the electron or photon commissioning plans?
- Alexandre
- Mike: Add BCM upstream of Hall D dump into the beam loss accounting system (BLM)?
- 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.
- Add column to table in p 11 to indicate what part of commissioning requires it
- Make p 12 into a table -> may be useful for guidance during commissioning
- Mike: Suggest that Hall D personnel participate in electron commissioning (as observers)
- p. 16: Before x-scale scan is performed, adjust diff in active collimator y to zero (i.e. center vertically)
- Todd: Range of corrector currents can cover 5x desired range in position on collimator
- p. 18: After controlled access - recheck electron orbits and rates in PS
- Stepan: Could locate extra profile monitor (in his office) at beam dump
- p. 19: see note from p. 18