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KOTO experiment will reuse the CsIcrystals which were used at KTeV experiment to improve the position and energy resolutions.
Y.Yanagida et al. for the J-PARC E14 KOTO Collaboration
Unstacking and Packing all of the KTeV CsI in 2008
Reusing KTeV CsI CrystalsFor J-PARC KOTO
Difference between KTeV and KOTO CsI Calorimeters
3 2 19 8 7 6 5 415 14 13 12 11 1021 20 19 18 17 1627 26 25 24 23 2233 32 31 30 29 28
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38 37 36 35 34
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Gone 38
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Gone Gone Gone Gone Gone GoneGone Gone Gone Gone Gone Gone93 (Mtest) 2763 (Mtest) 2764 (Mtest) 2057 (Mtest) Gone Gone2878 (Mtest) 3443 (Mtest) 2469 (Mtest) 3454 (Mtest) 1660 (Mtest) 3357 (Mtest)2209 (Mtest) 2923 (Mtest) 3451 (Mtest) 94 (Mtest) 96 (Mtest) 2637 (Mtest)
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38 3450 1914 1093 611 779 1653 3518
8 7 6 5 4 314 13 12 11 10 920 19 18 17 16 1526 25 24 23 22 2132 31 30 29 28 2738 37 36 35 34 33
・Environment: Dry Room → Vacuum tank No easy access ・Reliable structure to hold PMT ・Low power Cockcroft-Walton base for PMT
・Figure: Square → Circular ・Fill the gap between the CsI and the cylinder with Lead/scintillator sandwich detector.
KOTO Detectores
CsI Calorimeter
1. Place a crystal on a glass plate to keep it flat.
2. Insert a spacer underneath a mumetal shield.
3. Vacuum pack the crystal to avoid moisture.
4. Protect crystal with two Al angles with rubber cushions.
5. Pack them in air freight cases.
6. Carry crates into our dry room and stack crystals in trays.
Introduction
E391a CsI
KTeV CsI
E391a KOTOKTeV
KTeV 5x5 cm²
KTeV 2.5x2.5 cm²
Event display fortwo photons
7x7 cm²
50 cm long(27X )⁰
50 cm long(27X )⁰
30 cm long(16X )⁰
CsI Crystal
Myler
fiber holderMar.
To Osaka Univ. To Chicago Univ.
Osaka, Japan
Apr.
Oct.
Jun.Jul.
Sept.
Nov.Dec.
fiber
cables
HV dividerMagnetic shield
PMT
hook
Chicago, U.S.A.
