A detailed test of the CsI(Tℓ) calorimeter for BELLE with photon beams of energy between 20 MeV and 5.4 GeV

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 441; no. 3; pp. 401 - 426
• Main Authors: Ikeda, H., Satpathy, A., Ahn, B.S., Aulchenko, V.M., Bondar, A.E., Cheon, B.G., Chu, T.H., Fukushima, M., Garmash, A.Yu, Hayashii, H., Jang, H.K., Kaneyuki, K., Kazui, K., Kezerashvili, G.Ya, Kim, H.J., Kremyanskaya, E.V., Kuzmin, A.S., Lee, M.H., Miyabayashi, K., Muchnoi, N.Yu, Naumenkov, A.I., Noguchi, S., Park, C.S., Popov, V.G., Protopopov, I.Ya, Pogorelov, Yu.A., Romanov, L.V., Root, N.I., Sagawa, H., Shatilov, D.N., Sidorov, A.V., Simonov, E.A., Shwartz, B.A., Tamai, K., Tsukamoto, T., Usov, Yu.V., Watanabe, Y., Zhilich, V.N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2000
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(99)00992-4

The results of a beam test of a prototype of the BELLE CsI(Tℓ) calorimeter are reported. The test used beams of photons with energies spanning the range from 20 MeV to 5.4 GeV, produced at ROKK-1M facility of the Budker Institute of Nuclear Physics. The single-counter energy-equivalent noise was measured to be ∼200 keV. The design goals for the energy resolution, e.g. 4% at 20 MeV and 1.7% at 5.4 GeV, were achieved using the sum of energy deposits in a 5×5 crystal matrices with a single crystal energy threshold of 0.5 MeV; the summed energy deposit measured in the array corresponds to 97±2% of the incident photon energy over the entire energy range. The average position resolution for 470 MeV energy photons was measured to be 8 mm.