Csi Calorimeter For The J-Parc Koto Experiment

K. Sato,J.W. Lee, S. Banno, M. Campbell,J. Comfort, T. Furukawa,E. Iwai, N. Kawasaki,T.K. Komatsubara,G.Y. Lim, Y. Maeda,T. Masuda, T. Matsumura,D. Mcfarland,R. Murayama,D. Naito,Y. Nakaya,H. Nanjo,T. Nomura, Y. Odani, T. Ota,Y.D. Ri,M. Sasaki, N. Sasao, S. Seki,T. Shimogawa,T. Shinkawa,K. Shiomi,Y. Sugiyama, S. Suzuki,Y. Tajima,M. Tecchio,M. Togawa, T. Yamanaka,Y. Yanagida, H. Yokota,H. Yoshimoto,Y.W. Wah,H. Watanabe,J. Xu

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT（2020）

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摘要

An electromagnetic calorimeter made of undoped CsI crystals is used in the J-PARC KOTO experiment to search for new physics beyond the standard model with the K-L -> pi(0)v (v) over bar decay. The calorimeter is designed to operate in vacuum of 0.1 Pa and in a high-rate environment where the counting rate due to K-L decays is O(100) kHz. A special method to calibrate the calorimeter during the data taking without using a tracking system for charged particles is reported. The energy, position, and timing resolutions of the calorimeter were evaluated in several beam tests, and the resolutions satisfy the required performance. The energy resolution with the total energy E is 0.66 circle plus 1.81/root E[GeV]% in the inner region of the calorimeter.

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关键词

Pure CsI, Undoped CsI, Calorimeter

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