Monte Carlo Study of Performance of BES Ⅲ CsI Crystal Calorimeter

LIU Chun-Xiu; FU Cheng-Dong; ZHOU Li; ZHANG Qin-Jian; XIA Xiao-Mi; LAI Yuan-Fen; LI Jin; FANG Jian; CHEN Yuan; CAI Xiao; SHANG Lei; WANG Man; LU Jun-Guang; WANG Yi-Fang

Chinese Physics C> 2004, Vol. 28> Issue(4) : 335-339

Monte Carlo Study of Performance of BES Ⅲ CsI Crystal Calorimeter

Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
In the process of design and research of BES Ⅲ crystal calorimeter, we made a detailed Monte Carlo study for the performance of BES Ⅲ CsI crystal calorimeter on the basis of the detection cell of 7×7 CsI matrix. Results are presented on incoherent noise, on energy linearity, on uniformity of the crystal light output, on position dependence. Those results show that the energy resolution of the 5×5 matrix sum is about 2.1% for 1 GeV photon and the best energy resolution of the lower energy photon is obtained with the energy threshold of 2.5 σ_noise. The energy deposit in the matrix decreases by about 1% and the energy resolution degrades by about 0.3% when 800MeV photons are injected in the gap region between two crystals. The average position resolution is about 6.3 mm at 800 MeV.

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LIU Chun-Xiu, FU Cheng-Dong, ZHOU Li, ZHANG Qin-Jian, XIA Xiao-Mi, LAI Yuan-Fen, LI Jin, FANG Jian, CHEN Yuan, CAI Xiao, SHANG Lei, WANG Man, LU Jun-Guang and WANG Yi-Fang. Monte Carlo Study of Performance of BES Ⅲ CsI Crystal Calorimeter[J]. Chinese Physics C, 2004, 28(4): 335-339.

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Received: 2003-07-15
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Monte Carlo Study of Performance of BES Ⅲ CsI Crystal Calorimeter

Corresponding author: LIU Chun-Xiu,

Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date: 2003-07-15

Accepted Date: 1900-01-01

Available Online: 2004-04-05

Abstract: In the process of design and research of BES Ⅲ crystal calorimeter, we made a detailed Monte Carlo study for the performance of BES Ⅲ CsI crystal calorimeter on the basis of the detection cell of 7×7 CsI matrix. Results are presented on incoherent noise, on energy linearity, on uniformity of the crystal light output, on position dependence. Those results show that the energy resolution of the 5×5 matrix sum is about 2.1% for 1 GeV photon and the best energy resolution of the lower energy photon is obtained with the energy threshold of 2.5 σ_noise. The energy deposit in the matrix decreases by about 1% and the energy resolution degrades by about 0.3% when 800MeV photons are injected in the gap region between two crystals. The average position resolution is about 6.3 mm at 800 MeV.

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Monte Carlo Study of Performance of BES Ⅲ CsI Crystal Calorimeter

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