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

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.

end-cap TOP

Cover by TOP

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

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

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

• 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?