View source for Pion Meeting February 12 2021 11AM ET

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=Agenda=
# Different designs for the newgeometry with shielding in the electron and pion generator (Elham) [https://moller.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=690]

=Attendance=

Elham, Wouter, David

=Minutes=

New design evaluation:
* lucite tilted at 22.5 deg
* lucite tilted at 45 deg
* larger lead donut outer radius

Increase in pion rate when adding 10 cm lead: probably scattering of larger radius pions into the lucite when they otherwise would have just hit the hall wall

The rate for the Moller generator with > 2 MeV goes up when the lucite is tilted: lucite covers more solid angle for a shower on the outer downstream radial edge of the lead donut. But why does that corner light up?

Q: We should determine the dependence of the pi/e ratios on the radial lead donut extent from 16 cm to larger than 26 cm.

Q: We should run with a lucite with 5 cm height.

Q: Run visualization for Moller generator events that cause light to reach the pion detector PMT.

Q: How important is the ep tail for this larger lead donut radial extent?

Q: Can we extend only the concrete in radius, not the lead? Can we make the lead thinner if we make it further in radius?

Studies:
* concrete/lead radius extend 16, 21, 26, 30, 35 cm
* keep concrete at 16 cm, extend lead only to 26 cm
* keep lead at 16 cm, extend concrete only to 26 cm
* fix downstream face of donut, then reduce lead thickness