View source for Pion Meeting June 4 2021 11AM ET

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* Bluejeans link: [https://bluejeans.com/420107252 420 107 252]
* Dial-in: [tel:408-740-7256p420107252# 408-740-7256] (US), [tel:888-240-2560p420107252# 888-240-2560] (US Toll Free), [tel:408-317-9253p420107252# 408-317-9253] (Alternate number)

=Agenda=

# Updates on pion detector studies (Elham) [https://moller.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=735]
# Beam generator simulations (Raj)

=Attendance=

David, Elham, Julia, Raj, Wouter

=Minutes=

* Pion detector studies (Elham)
** Entire pion donut holding frame changed to vacuum
*** improves pi/e ratio by factor 2
*** still have charged particles reach lucite
*** frame is significant source of background
** Shorter lucite detector and shifted inwards:
*** improves pi/e ratio marginally but not dramatically
** TODO
*** Set the lucite lightguide to vacuum: check whether lightguide or PMT is a big part of the source of background in our lucite
*** Look at hit.phi - hit.vphi (= atan2(hit.vx,hit.vy)): does background come from same or different sector?
*** Draw separate sources independently and zoomed in: one plot each for showermax, concrete/lead, lightguide, lucite close-up with shielding, with number of entries shown on each plot
*** Draw direction histogram for lucite hits at top surface: 1d histo of momentum theta, 2d histo of momentum theta and phi, 1d histo of dot product with axis towards PMT
*** Check pi/e ratio at the main detector plane 28, probably only needs 100k events
*** Copy files from /home/elhamm/projects/rrg-jmammei/elhamm/PionDetectorOptimization/simulation/scratch/16-16-AllFrame-Galactic-2cmshiftedLucite-7cm/moller.root to volatile