BNL 4/21-28 PID: end-cap TOP M.Niiyama
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BNL 4/21-28PID: end-cap TOP M.Niiyama
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BNL 4/21-28
• Sorting of design drawings for E787/E949• Take copies of Yoke/Coil/Leg part of magnet miho:/home/niiyama/leps2/E949_drawings/• Check old Range Stack in Physics Build.
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end-cap TOP
Cover by TOP
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Option: A• Symmetric wrt phi• 6 sectors, many faces may cost for polishing 600 Man-yen * 6 = 3600 Man-yen MCP 100 Man-yen * 40 = 4000 Man-yen
0.5-0.7m
Beam view
0.2 m width on MCP side is necessary to reconstructcerenkov angle. Particles hit MCP?
Reflect by mirror
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Option: B• Put 2 bars• lower cost• Position dependence• 600 Man-yen * 2 = 1200 Man-yen MCP 100 Man-yen *30 = 3000 Man-yen
0.9m
Beam view
0.9 m q = 14 deg
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Separation power of TOP• (DTOF + DTOP)/ (s*sqrt(Nphoton))• s : 100 ps, (80ps measured)• Nphoton: 20• Option A p/K
DTOF
DTOP
DTOF+TOP
3 s separation 133 ps
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• What about for option B?• Ask advice from Nagoya group on 26th May. Uchida, Morino, Niiyama • Barrel part: 3.1 m x 0.9m TOP MCP 100 Man-yen * 100 = 1 Oku-yen -> cheeper option? Crystal 600 Man-yen * 5 = 3000 Man-yen• Put threshold-type AC in RS region• RICH?
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