[Sane-analysis] Minutes of April 21 Meeting

[Narbe Kalantarians]

_*Narbe:*_ Latest field corrections implemented in to GEANT. Looked over 
plots with Oscar and Hovhannes and determined the reconstruction is 
being done correctly. Will be able to use this now for obtaining 
dilution factors, relative efficiencies, and radiative corrections.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/SANE_GEANT


_*James:*_ Started on Tech Note detailing the work he did for the target 
polarization analysis. This explains the process of obtaining the 
corrected target polarizations.
http://twist.phys.virginia.edu/~jdm2z/sane/target_tech_note.pdf

Updated work on Cerenkov TDC peaks from last week. Results appear to be 
consistent with Whitney's numbers.


_*Jon:*_ Worked on Cerenkov efficiency. Obtained vector coefficients for 
these.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Jrm_cer_effic

Looked at double peak events in Cerenkov, to pick out possible photon 
conversion events. Didn't appear to be that many. Will look with more 
statistics though.
Mark suggested possibly looking at double cluster events which went 
through only one Cerenkov mirror but double cluster at BigCal to pick 
out e+e- pair candidates that originated from the target.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Jrm_double_clust


_*Whit:*_  Started database(s) tabulating the different Cerenkov 
configurations during the running. Still a work in progress, but in a 
useful state.
http://quarks.temple.edu/~whit/SANE/databases/


_*Anusha:*_ Looked at sieve slit run to study observed shift in hsxptar. 
Applied Gaussian fit to get offset, which was used for the slow raster y 
offset. Then applied beam offset (from EPICS) to correct x, y, and P 
diff (measured - expected). The sieve-slit offset seems to be a 
significant effect. This was done for the 5-pass elastic runs.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Sieve_Slit


As always, please let me know if I got something wrong or left out anything.

Next meeting will be on April 28th.


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