The HERMES Polarized Hydrogen and Deuterium Gas Target in the HERA Electron Storage Ring The HERMES Collaboration
The HERMES Polarized Hydrogen and Deuterium Gas Target in the HERA Electron Storage Ring The HERMES Collaboration
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发表时间：
2004
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影响因子：
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通讯作者：
A. Airapetian;N. Akopov;Z. Akopov;M. Amarian;A. Andrus;E. Aschenauer;W. Augustyniak;R. Avakian
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文献类型：
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作者：
A. Airapetian;N. Akopov;Z. Akopov;M. Amarian;A. Andrus;E. Aschenauer;W. Augustyniak;R. Avakian
自1996年以来，Hermes氢气和氘核极化气体靶一直与DESY的HERA极化电子束一起使用，以研究核子自旋结构。来自斯特恩-格拉赫原子束的极化原子被注入到HERA电子环内部的存储单元中。分析从储存室中心扩散到侧管中的原子，以确定原子分数和原子极化。原子具有核极化，其轴由外部磁场保持场定义。1996-2000年为纵向持续场，2001年为横向持续场。描述了靶标的设计，概述了目标极化的分析方法，给出了靶标在不同运行周期下的性能。
The HERMES hydrogen and deuterium nuclear-polarized gas targets have been in use since 1996 with the polarized electron beam of HERA at DESY to study the spin structure of the nucleon. Polarized atoms from a Stern-Gerlach Atomic Beam Source are injected into a storage cell internal to the HERA electron ring. Atoms diffusing from the center of the storage cell into a side tube are analyzed to determine the atomic fraction and the atomic polarizations. The atoms have a nuclear polarization, the axis of which is defined by an external magnetic holding field. The holding field was longitudinal during 1996-2000, and was changed to transverse in 2001. The design of the target is described, the method for analyzing the target polarization is outlined, and the performance of the target in the various running periods is presented.