SLAC Analysis Meeting March 1 2019 12PM ET

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Agenda

• PREX Tandem data
• Simulation software updates
• Documentation of Analysis and Readmes
• GEM decoding, centroid ROOT files, and tracking

Attendance:

• Attendance: Cameron, Tao, Chandan, Dustin, Carlos, Brady
• Excused:

Minutes

• Tao's GEM tracking analysis is able to get tracks very cleanly with the GEM cosmic stand in JLab TEST lab high bay setup.
  • Some cuts and analyses for angular distributions can already start being made.
  • This algorithm can be unleashed on SLAC test data, but the multiplicity question still needs to be answered, and the angular spread will be un-resolvable due to 2-GEM lack of constraints.
• PREX analysis will be done with Hall A analyzer (PODD) with SBS Tree Search algorithm used (not Tao's algorithm).
• "Tree Search" =/= ROOT Tree information, rather analysis logic chain: Wiki article, Ole's talk from 2007.
• GEMs need some more attention before jumping into building the PREX counting mode DAQ - discuss later, and consider VME crate rates and space concerns.
• Brady will begin working on analysis tasks more aggressively this week and for the rest of the semester.
  • Apply the poissonian beam multiplicity fit to all data runs? Add to analyzer or leave as a macro in github.
• Carlos will look at PMT 1's gain over all runs to make sure its apparent very very large gain is real and what the cause is. PMT 2 is within 10% of gain expectations.
  • Devi will look into this PMT's linearity. Gain has risen from 1.2->1.6 x 10^6.
  • Could it be due to a bad or incorrect base? Brady will need to consider these things and look into the gain problem (possibly re-measure it at JLab).

Connection Info

The Meeting Information is:
Phone Dial In:
1.888.240.2560 (US Toll Free)
1.408.317.9253 (US Primary)

Meeting ID: 350 784 981
Moderator Passcode: 1234

https://jlab.bluejeans.com/350784981

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