Difference between revisions of "Aug 29, 2019"

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*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.
 
*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 I allot 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 to measure rate effects 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. There was pushback from Paul on (4) since he does not think it will be interpretable especially without a new Q1 and dipole scan.
+
*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 to measure rate effects 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. There was pushback from Paul on (4) since he does not think it will be interpretable especially without a new Q1 and dipole scan.
  
 
Run plan
 
Run plan

Revision as of 16:20, 29 August 2019

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Agenda:

Systematics Discussion: Don [1]

Connection details:

Meeting URL https://bluejeans.com/388466836

Meeting ID 388 466 836

US toll free phone 1.888.240.2560

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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 to measure rate effects 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. There was pushback from Paul on (4) since he does not think it will be interpretable especially without a new Q1 and dipole scan.

Run plan

  1. Setup = 3 hr
  2. Quad and dipole scans = 2.5 hr
  3. 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
  4. 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 hours OR In and Out on 4 micron @ 3T = 2
  5. Rate scan = 1 hr (optional if haven't already diagnosed 4/10 foil difference to rule out rate dependence)
    • 2 extra points at 1 1.5 muA and 0.3 muA on 10 micron = 1 hour
  6. Additional measurements time permitting
    • In and Out on 4 micron at different position (2mm offset)
    • 8 PMT measurement on 10 micron = 1hr
  7. Backout = 1.2 hours