CDMS IIDAQ `Final’ Detector Design Meeting April 3, 2008 University of California, Santa Barbara...
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CDMS II DAQ `Final’ Detector Design Meeting April 3, 2008 University of California, Santa Barbara Harry Nelson
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Transcript of CDMS IIDAQ `Final’ Detector Design Meeting April 3, 2008 University of California, Santa Barbara...
CDMS IIDAQ
`Final’ Detector Design
Meeting
April 3, 2008
University of California, Santa Barbara
Harry Nelson
April 3, 2008 n Detector Meeting - Harry Nelson 2
nUCSBSignal 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 3
nUCSB
April 3, 2008 n Detector Meeting - Harry Nelson 4
nUCSB
200 cm (79”)
A `Box of Rain’ – Calculate 5 pe/MeV
White DiffusiveReflectorWater +
GdCl3
Two Super-K Tubes – need low level coincidence
60 c
m (
24”)
April 3, 2008 n Detector Meeting - Harry Nelson 5
nUCSB
Formulas for Collection Efficiency
April 3, 2008 n Detector Meeting - Harry Nelson 6
nUCSB
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 7
nUCSB
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
