The TASSO gas and aerogel Cherenkov counters

Nuclear Instruments and Methods Pub Date : 1981-06-01 DOI:10.1016/0029-554X(81)90732-1

H. Burkhardt, P. Koehler , R. Riethmüller, B.H. Wiik, R. Fohrmann, J. Franzkea, H. Krasemann, R. Maschuw , G. Poelz, J. Reichardt, J. Ringel , O. Römer, R. Rüsch, P. Schmüser, R. van Staa, J. Freeman, P. Lecomte, T. Meyer, Sau Lan Wu, G. Zobernig

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引用次数: 39

Abstract

We describe the gas and erogel threshold Cherenkov counters built for the TASSO experiment at the DESY e⁺e⁻ storage ring PETRA. The counters are arranged in two diametrically opposed groups as part of the two hadron arms. The gas counters contain Freon 114 and CO₂ respectively; 128 ellipsoidal mirrors focus the Cherenkov light through funnels onto Philips 5″ photomultipliers coated with wavelength shifter. β = 1 charged particles are detected with at least 99.9% efficiency. The aerogel counters are of the diffusing wall type. They have a sensitive area of 12 m², divided into 32 cells and use a total of 192 RCA Quantacon 5″ photomultipliers. The average aerogel refractive index is around 1.025. The efficiency for β = 1 charged particles is 98%. Design considerations, prototype evaluation, construction details, and performance of the final counter system are described.

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TASSO气体和气凝胶切伦科夫计数器

我们描述了在DESY e+e -存储环PETRA上为TASSO实验建立的气体和凝胶阈值切伦科夫计数器。计数器被布置在两个截然相反的组中，作为两个强子臂的一部分。气体计数器分别含有氟利昂114和CO2;128个椭球面反射镜将切伦科夫光通过漏斗聚焦到涂有波长移位器的飞利浦5″光电倍增管上。β = 1带电粒子的检测效率至少为99.9%。气凝胶计数器为扩散壁型。它们的敏感面积为12平方米，分为32个单元，总共使用192个RCA Quantacon 5″光电倍增管。气凝胶的平均折射率在1.025左右。β = 1带电粒子的效率为98%。描述了设计考虑、原型评估、构造细节和最终计数器系统的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nuclear Instruments and Methods

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