Difference between revisions of "Aug 29, 2019"
From Hall A Wiki
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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 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. | + | *Don proposed the plan below for the next measurement (revisions in italics). 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. |
#Setup = 3 hr | #Setup = 3 hr | ||
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#Saturation verification @ 3.5 T = 2.5 - 5 hr | #Saturation verification @ 3.5 T = 2.5 - 5 hr | ||
#*In and Out on 4 micron = 2.5 hours | #*In and Out on 4 micron = 2.5 hours | ||
| − | #*Consistent? = Move to step 5. | + | #*<s>Consistent? = Move to step 5. </s> |
| − | #*Inconsistent? In and Out on 10 micron @3.5T= 1.8 hours OR In and Out on 4 micron @ 3T = 2 | + | #*<s>Inconsistent?</s>In and Out on 10 micron @3.5T= 1.8 hours<s> OR In and Out on 4 micron @ 3T = 2</s> |
#Rate scan = 1 hr (optional if haven't already diagnosed 4/10 foil difference to rule out rate dependence) | #Rate scan = 1 hr (optional if haven't already diagnosed 4/10 foil difference to rule out rate dependence) | ||
| − | #*2 extra points at 1 muA and 0.3 muA on 10 micron = 1 hour | + | #*2 extra points at ''1.5'' muA and 0.3 muA on 10 micron = 1 hour |
#Backout = 1.2 hours | #Backout = 1.2 hours | ||
Revision as of 16:11, 29 August 2019
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Original Moller Polarimeter Page
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
Dial in, type in the meeting ID and then press ##
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 for the next measurement (revisions in italics). 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.
- 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 1.5 muA and 0.3 muA on 10 micron = 1 hour
- Backout = 1.2 hours
