Difference between revisions of "Tuesday, Jul 9, 2013 11:00am EDT"
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(New page: == Logistic information == Phone number: 1-866-740-1260 Access code: 1978431#) |
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Phone number: 1-866-740-1260 | Phone number: 1-866-740-1260 | ||
Access code: 1978431# | Access code: 1978431# | ||
+ | |||
+ | == Agenda == | ||
+ | |||
+ | http://ace.phys.virginia.edu/MollerSpectrometer/259 | ||
+ | |||
+ | == Minutes == | ||
+ | Attendance: Wouter, Seamus, Nilanga, David A., Rupesh, Mark P. | ||
+ | |||
+ | *Dave A. | ||
+ | ** 4 GEMs, provide wiggle room for inefficiencies and failures | ||
+ | |||
+ | *Nilanga: | ||
+ | ** ~95% efficiency - what we have measured so far | ||
+ | ** GEMs need to be out of vacuum | ||
+ | ** Need not worry about vacuum | ||
+ | ** With GEMs we can have resolution of about 100 um or so. | ||
+ | ** Can we improve th-th_rec by using 100 um instead of 500um | ||
+ | |||
+ | *David A./Seamus: | ||
+ | ** We need to be using r/dr as cuts, not th | ||
+ | |||
+ | *Mark P. | ||
+ | ** The detector scans needed for Moller events, not ep | ||
+ | |||
+ | *David A. | ||
+ | ** Interested in Moller asymmetries | ||
+ | ** Collimator motions are important | ||
+ | ** Maybe eps will be sensitive to small angles | ||
+ | |||
+ | *Mark P. | ||
+ | ** Tolerances of positioning collimator hole | ||
+ | ** Does this change the distribution of millers, eps at the detector? | ||
+ | |||
+ | * Things to do: | ||
+ | ** Inner/out collimator motion | ||
+ | ** p6. plots with GEM resolution much worse | ||
+ | *** If 100um GEM res reduces the diff widths, then good, | ||
+ | else these widths are not determined by the tracking system. | ||
+ | |||
+ | *Seamus | ||
+ | ** 5m between the first and last GEMs -> Move the first/second GEMs closer to downstream GEMs | ||
+ | |||
+ | *David A. | ||
+ | ** Main purpose of good resolution is to verify that we have valid tracks | ||
+ | ** The distributions that we have are not going to change very much with resolution, I suspect | ||
+ | |||
+ | * Meet in a week, same time. |
Latest revision as of 11:46, 9 July 2013
Logistic information
Phone number: 1-866-740-1260 Access code: 1978431#
Agenda
http://ace.phys.virginia.edu/MollerSpectrometer/259
Minutes
Attendance: Wouter, Seamus, Nilanga, David A., Rupesh, Mark P.
- Dave A.
- 4 GEMs, provide wiggle room for inefficiencies and failures
- Nilanga:
- ~95% efficiency - what we have measured so far
- GEMs need to be out of vacuum
- Need not worry about vacuum
- With GEMs we can have resolution of about 100 um or so.
- Can we improve th-th_rec by using 100 um instead of 500um
- David A./Seamus:
- We need to be using r/dr as cuts, not th
- Mark P.
- The detector scans needed for Moller events, not ep
- David A.
- Interested in Moller asymmetries
- Collimator motions are important
- Maybe eps will be sensitive to small angles
- Mark P.
- Tolerances of positioning collimator hole
- Does this change the distribution of millers, eps at the detector?
- Things to do:
- Inner/out collimator motion
- p6. plots with GEM resolution much worse
- If 100um GEM res reduces the diff widths, then good,
else these widths are not determined by the tracking system.
- Seamus
- 5m between the first and last GEMs -> Move the first/second GEMs closer to downstream GEMs
- David A.
- Main purpose of good resolution is to verify that we have valid tracks
- The distributions that we have are not going to change very much with resolution, I suspect
- Meet in a week, same time.