Minutes: SBS Meeting August 22, 2012
Attendees: Todd Averett, Alexandre Camsonne, Carlos Ayerbe Gayoso, Huan Yao, Scott Burkiss, Austin 
Milby, Bogdan Wojtsekhowski, Nilanga Liyanage, Brian Quinn, Vincenzo Bellini, Thia Keppel, Seamus 
Riordan

1)	Todd Averett gives talk on "Update on the Gas Ring Imaging Cherenkov (GRINCH) Detector for A1n 
using BigBite"
a)	For his slides see pdf link or pptx link
b)	General elements of the talk:
i)	Motivation (high rates, various spec's and what drives them)
ii)	Observed d2n background (higher on the beam line side)
iii)	Rate estimates relative to d2n
iv)	Prototype detector:
(1)	Tests (setup and problems)
(2)	Results
v)	Simulation and design
(1)	Path length 70(65) cm
(2)	Single reflection from cylindrical mirrors.  No focusing on specific PMT's, not sensitive to 
precise geometry
(3)	Events look good
vi)	Details of conceptual design
(1)	Starting real design
(2)	Shows some preliminary drawings
vii)	Expected p-/e-
viii)	p rejection vs. momentum (stay tuned for electron efficiencies, they're working on them)
ix)	Magnetic shielding issues.
(1)	TOSCA simulation shows plan that works critical component of B <0.1 gauss
x)	Plans:
(1)	Finish simulation to optimize geometry, gas pressure, efficiency, pion rejection.
(2)	Focus on design work with Jlab Design Group.
(3)	NC A&T University to build and test PMT array iron box and magnetic shielding.  Samuel 
Danagoulian, Abdellah Amidouch
(4)	Begin mirror design studies.
    -JJL