Zoom link: contact David Armstrong, Elham Gorgannejad, or Jennifer Finch for the link.

Agenda

Updates on the modified mechanical design of the pion detector prototype- (Elham)
Comparison of photoelectron rates in 21cm and 23cm Lucite- (Elham)
AOB

Attendance

(Elham) Mechanical Design updates: have created a mechanical design with 3D printed parts only; shell is 2 mm thick, width of lucite 21 cm. Have a pattern of holes for bolting to angle brackets. Still being worked on. Plan is to complete mechanical design in two weeks; then will make a prototype, test mount to angle brackets, perhaps in a mocked-up "donut" cavity, and test light-tightness. The present idea is that the lucite is wrapped in Tyvek and sits snugly in the 3D printed box. Probably glue PMT to lucite; if need to repair/replace one detector (probably the PMT is the only thing that might go bad), would replace entire module, so don't have to make the PMT easily removable from the lucite/box. Cylindrical shell for the PMT - might moved to a threaded connection. Will get cost estimate for the 3D printing, and various parts.
(Elham) Looked at impact of reducing lucite width from 23 cm to 21 cm (as required by space constraints in pion donut cavity) - looks like only a marginal effect. Rate of photoelectrons from pi's and from Mollers are only slightly reduced; pi/e photoelectron ratio reduced slightly from 76.4% to 72.6%. Seems quite acceptable.
(Elham) started work on checking efficiency of our pion generator.
(all) We will probably skip next week's meeting.