A highly polarized hydrogen / deuterium internal gas target embedded in a toroidal magnetic spectrometer
A highly polarized hydrogen / deuterium internal gas target embedded in a toroidal magnetic spectrometer
复制标题
嵌入环形磁谱仪中的高度极化氢/氘内部气体靶
DOI：
10.1016/j.nima.2005.10.104
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发表时间：
2006
影响因子：
1.4
通讯作者：
C. Zhang
中科院分区：
文献类型：
--
作者：
D. Cheever;E. Ihloff;J. Kelsey;H. Kolster;N. Meitanis;R. Milner;A. Shinozaki;E. Tsentalovich;T. Zwart;V. Ziskin;Y. Xiao;C. Zhang
在美国麻省理工学院-贝茨直线加速器中心的南霍尔环（SHR）内靶区建立了一个极化氢氘内靶，用于850 MeV电子自旋散射的测量。该目标使用原子束源（ABS）将高度极化的原子流注入薄壁涂层存储单元。使用康普顿激光背散射偏振计测定电子束的偏振。使用众所周知的核反应来确定目标极化。将ABS和存储单元嵌入Bates大型接受环形光谱仪（BLAST）中，该光谱仪用于检测来自电子-靶相互作用的散射粒子。该目标已被设计为快速（108小时）切换操作从氢到氘。此外，该目标是第一个在磁场超过2kG的情况下在磁谱仪内操作的目标。获得了2.5× 10 ~（16）at/s的ABS强度和高偏振度（~ 70%）。这里描述了目标设计和构造的细节，并报告了18个月期间的性能。
A polarized hydrogen/deuterium internal gas target has been constructed and operated at the internal target region of the South Hall Ring (SHR) of the MIT-Bates Linear Accelerator Center to carry out measurements of spin-dependent electron scattering at 850MeV. The target used an Atomic Beam Source (ABS) to inject a flux of highly polarized atoms into a thin-walled, coated storage cell. The polarization of the electron beam was determined using a Compton laser backscattering polarimeter. The target polarization was determined using well-known nuclear reactions. The ABS and storage cell were embedded in the Bates Large Acceptance Toroidal Spectrometer (BLAST), which was used to detect scattered particles from the electron–target interactions. The target has been designed to rapidly (∼8h) switch operation from hydrogen to deuterium. Further, this target was the first to be operated inside a magnetic spectrometer in the presence of a magnetic field exceeding 2kG. An ABS intensity 2.5×1016at/s and a high polarization (≈70%) inside the storage cell have been achieved. The details of the target design and construction are described here and the performance over an 18 month period is reported.