Performance of the new hadron blind HADES RICH in heavy ion collisions

M. Becker, M. Dürr, M. Faul, J. Förtsch, J. Friese, C. Höhne, K.-H. Kampert, S. Lebedev, J. Michel, J.-H. Otto, V. Patel, C. Pauly, D. Pfeifer, E. Schwab, M. Traxler, A. Weber
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Abstract

The High Acceptance Dielectron Spectrometer (HADES) situated at GSI Darmstadt, Germany, has recently upgraded its gaseous ring imaging Cherenkov (RICH) detector. Studying the properties of the hot and dense fireballs produced in heavy ion collisions the RICH is the key component to efficiently identify electrons and positrons emitted therein. The new photon detection plane is comprised of 428 multianode photo electron multipliers (MAPMT)(Hamamatsu H12700) partly coated with p-Terphenyl as a wavelength shifter. It is operated with a gaseous C4H10 (isobutane) radiator making it essentially hadron blind for particle momenta up to approximately 2.5 GeV/c. All 27392 MAPMT channels are read out by an FPGA based readout electronic scheme called DIRICH, which will also be used in other future Cherenkov detectors. The DIRICH readout allows to measure leading and trailing edges for each pixel pulse and hence time over threshold and hit arrival time down to sub-nanosecond precision. This article will discuss the key features of the upgraded HADES RICH and its performance based on a Ag+Ag run at E=1.58A GeV incident energy within the FAIR Phase-0 research program.
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新型强子盲HADES RICH在重离子碰撞中的性能
位于德国达姆施塔特GSI的高接受度介电子光谱仪(HADES)最近升级了其气体环成像切伦科夫(RICH)探测器。研究重离子碰撞产生的炽热致密火球的性质,RICH是有效识别其中发射的电子和正电子的关键部件。新的光子探测平面由428个多阳极光电子倍增器(MAPMT)(Hamamatsu H12700)组成,部分涂覆对三苯基作为波长移位器。它与气态C4H10(异丁烷)散热器一起工作,使其基本上对粒子动量高达约2.5 GeV/c的强子失明。所有27392个MAPMT通道都由基于FPGA的读出电子方案(称为DIRICH)读出,该方案也将用于其他未来的切伦科夫探测器。DIRICH读出允许测量每个像素脉冲的前后边缘,因此超过阈值的时间和命中到达时间降至亚纳秒精度。本文将讨论升级后的HADES RICH的主要特征及其在FAIR Phase-0研究计划中基于E=1.58A GeV入射能量的Ag+Ag运行的性能。
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