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Dynamically polarized target for the g2p and GEp experiments at Jefferson Lab

机译:杰斐逊实验室的g2p和GEp实验的动态极化目标

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摘要

Recently, two experiments were concluded in Hall A at Jefferson Lab which utilized a newly assembled, solid, polarized hydrogen target. The primary components of the target are a new, high cooling power [subscript 4]He evaporation refrigerator, and a re-purposed, superconducting split-coil magnet. It has been used to polarize protons in irradiated NH[subscript 3] at a temperature of 1 K and at fields of 2.5 and 5.0 tesla. Maximum polarizations of 55% and 95% were obtained at those fields, respectively. To satisfy the requirements of both experiments, the magnet had to be routinely rotated between angles of 0°, 6°, and 90° with respect to the incident electron beam.
机译:最近,在杰斐逊实验室A厅的两个实验中进行了总结,该实验利用了新组装的固态极化氢靶。目标的主要组成部分是新型的高冷却功率[下标4] He蒸发制冷机,以及重新设计的超导分流线圈磁体。它已被用来极化在1 K温度和2.5和5.0特斯拉场的NH [下标3]中的质子。在这些场上分别获得了55%和95%的最大极化。为了满足两个实验的要求,磁体必须相对于入射电子束常规地在0°,6°和90°的角度之间旋转。

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