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BNL 4/21-28 PID: end-cap TOP M.Niiyama

BNL 4/21-28 PID: end-cap TOP M.Niiyama. 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. BNL 4/21-28. end-cap TOP. Cover by TOP. Option: A Symmetric wrt phi

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BNL 4/21-28 PID: end-cap TOP M.Niiyama

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  1. BNL 4/21-28PID: end-cap TOPM.Niiyama

  2. 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. BNL 4/21-28

  3. end-cap TOP Cover by TOP

  4. Option: A • Symmetric wrtphi • 6 sectors, many faces may cost for polishing • 600 Man-yen * 6 = 3600 Man-yen • MCP 100 Man-yen * 40 = 4000 Man-yen Beam view Reflect by mirror 0.5-0.7m 0.2 m width on MCP side is necessary to reconstruct cerenkovangle. Particles hit MCP?

  5. Option: B • Put 2 bars • lower cost • Position dependence • 600 Man-yen * 2 = 1200 Man-yen • MCP 100 Man-yen *30 = 3000 Man-yen Beam view 0.9m q = 14 deg 0.9 m

  6. Separation power of TOP • (DTOF + DTOP)/ (s*sqrt(Nphoton)) • s : 100 ps, • (80ps measured) • Nphoton: 20 • Option A • p/K DTOF+TOP 3 s separation 133 ps DTOF DTOP

  7. 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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