`Final’ Detector Design Harry Nelson Meeting April 3, 2008 University of California, Santa Barbara
n Detector Meeting - Harry Nelson Signal from γ’s from Neutron Capture in 0.2% GdCl3 From Super-K (courtesy of Mark Vagins UCI) About 22 pe (5 pe/MeV) Acceptance… 40% U/Th Chain April 3, 2008 n Detector Meeting - Harry Nelson
n Detector Meeting - Harry Nelson April 3, 2008 n Detector Meeting - Harry Nelson
A `Box of Rain’ – Calculate 5 pe/MeV Two Super-K Tubes – need low level coincidence 60 cm (24”) White Diffusive Reflector Water + GdCl3 200 cm (79”) April 3, 2008 n Detector Meeting - Harry Nelson
Formulas for Collection Efficiency April 3, 2008 n Detector Meeting - Harry Nelson
Required Diffuse Reflectivity 200 x 100 x 60 cm3 → 2 Super-K PMTs → φ=3.8% for ε >40%, need R>94% (8.4 bounces) Next Prototype: Cube 40 x 40 x 40 cm3 → 2 8” SK Veto PMTs → φ=5.9% for ε >40%, need R>90%, (5 bounces) Take this to Soudan… April 3, 2008 n Detector Meeting - Harry Nelson
n Detector Meeting - Harry Nelson Schedule…. Proceed with 40 x 40 x 40 detector – 2 months (?) Susanne has scoped out halon manufacture Give up on scintillator (95% confident) Major acquisitions split between FY2008/2009 April 3, 2008 n Detector Meeting - Harry Nelson