The HERMES Spectrometer
The HERMES Spectrometer
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DOI：
10.1016/s0168-9002(98)00769-4
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发表时间：
1998-06
影响因子：
1.4
通讯作者：
K. Ackerstaff;E. al.
中科院分区：
文献类型：
--
作者：
K. Ackerstaff;E. al.
HERMES 实验正在收集来自 H、D 和 3He 偏振目标的偏振正电子的包容性和半包容性深度非弹性散射的数据。这些数据提供了有关核子自旋结构的信息。本文介绍了为此目的而构建的前向角光谱仪。该光谱仪包括位于 1.3T.m 磁场前后的众多跟踪室（微带气室、漂移室和比例室），以及用于粒子识别的大量探测器（铅玻璃热量计、预喷淋探测器、跃迁辐射探测器和阈值切伦科夫探测器）。该光谱仪的两个主要特点是它对正电子和强子（特别是介子）具有良好的接收和识别能力。这些特性，加上目标的纯度，使 HERMES 能够为理解夸克自旋如何影响核子自旋做出独特的贡献。
The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and3He. These data give information on the spin structure of the nucleon. This paper describes the forward angle spectrometer built for this purpose. The spectrometer includes numerous tracking chambers (micro-strip gas chambers, drift and proportional chambers) in front of and behind a 1.3T.m magnetic field, as well as an extensive set of detectors for particle identification (a lead-glass calorimeter, a pre-shower detector, a transition radiation detector, and a threshold Cherenkov detector). Two of the main features of the spectrometer are its good acceptance and identification of both positrons and hadrons, in particular pions. These characteristics, together with the purity of the targets, are allowing HERMES to make unique contributions to the understanding of how the spins of the quarks contribute to the spin of the nucleon.