Aug 29, 2019
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Agenda:
Systematics Discussion: Don [1]
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Meeting ID 388 466 836
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Minutes Attendees: Paul S., Bill H., Don J., Eric K., Dave G, Simona M., Sanghwa P.
We went over some of the recent results discussing the two main issues: IN/OUT difference and 4 micron vs 10 micron foil difference
- Is the IN/OUT difference real? Dave G. said he has never before seen a persistent IN/OUT difference like we are seeing. It seems wise to request a precision Mott measurement at the 0.3% level which will take about 3 hours. Sanghwa suggested that we might be able to fit it in without too much argument from Hall B after the next Wein flip.
- Don proposed the plan below (with suggested revisions) for the next measurement. There was no opposition although Simona proposed a few changes. She believes the measurements can be done in less time than allotted and requests 1. that we do a saturation measurement on both 4 and 10 micron regardless 2. proposes turning up the current on the 10 micron foil to 1.5 muA in the rate scan (step 5) 3. Add a polarization measurement on 4 micron foil at a new position like 2mm off center. 4. Add a measurement with 8 PMTs on the 10 micron foil. Don and Dave supported the 8 PMT idea in principle but there was rather strong pushback from Paul since he does not think it will be interpretable especially without a special Q1 and dipole scan.
Run plan
- Setup = 3 hr
- Quad and dipole scans = 2.5 hr
- PREX polarization measurements @ 4T = 6.5 hr
- In and Out on Cu = 1.7 hours
- In and Out on 4 micron = 2.5 hours
- Quick Q1 rate scan = 1 hour
- In and Out on 10 micron = 1.8 hours
- Saturation verification @ 3.5 T = 2.5 - 5 hr
- In and Out on 4 micron = 2.5 hours
Consistent? = Move to step 5.Inconsistent?In and Out on 10 micron @3.5T= 1.8 hoursOR In and Out on 4 micron @ 3T = 2
- Rate scan = 1 hr (optional if haven't already diagnosed 4/10 foil difference to rule out rate dependence)
- 2 extra points at
1.01.5 muA and 0.3 muA on 10 micron = 1 hour
- 2 extra points at
- Additional measurements time permitting
- In and Out on 4 micron at different position (2mm offset)
- 8 PMT measurement on 10 micron = 1hr
- Backout = 1.2 hours