WLS Light Collectors - UC Davis

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• PMTs significant portion of WCD cost • PMT (+Base) cost (estimate): off the shelf cost ~$4200 • Additional casts for cabling and mounting Geometry Fiducial Vol. (kT) Coverage (%) # PMTs Off shelf Cost (M$) 25% reduced cost (M$) 50% reduced cost (M$) Right cylinder 100 20 57,129 239.9 179.9 120.0 Right cylinder 150 20 73,012 306.7 230.0 153.4 Right cylinder 200 (2 x 100) 20 114,258 479.9 359.9 240.0 Mailbox 150 20 84,466 354.8 266.1 177.4 Eg. LBNE far detector with 20% coverage. PMT numbers (not costs) taken from John Felde (<strong>UC</strong> <strong>Davis</strong>) for LBNE far detector simulation • Even 10% less PMTs leads to significant cost reduction. • Improved light collection efficiency is potential solution • Reflective cones (used in SNO) • WS plates (explored for IMB) • WS PMT coatings • Combination (plates or cones with WS coating) 2
• Explored for IMB • Square plates were pressure fit to the PMT • Demonstrated improvement (doubling) in collection efficiency 5” 60 cm (~24”) R. Claus et al, Nucl. Inst. and Meth. A261 pp. 540-542 (1987) • Improvements in design to be made • Circular geometry (20” outer radii prototypes) • Index matched RTV between plate and PMT • Tyvek with black backing on plate back. • Idea is to diffuse the light back into the plate and prevent escape through back 3
Page 1: LBNE Norm Buchanan, William Johnsto
Page 5 and 6: • Build and Test Prototype • Pr
Page 7 and 8: DAQ room SRS pulser 0.5 m fiber spl
Page 9 and 10: • Using a Hamamatsu HQE 10” R70
Page 11 and 12: Test fit (no Tyvek) Leveling LV pla
Page 13 and 14: PMT Only for all plots • Testing
Page 15 and 16: BC-499-76 Tyvek+RTV Misc costs (set
Page 18 and 19: PMT PMT • Want to get light in th
Page 20 and 21: • Contamination • ultra-pure wa

WLS Light Collectors - UC Davis

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