正向大接受角磁谱仪
A forward-angle large-acceptance magnetic spectrometer
AI总结：
本文介绍了在泰勒·杰弗逊国家加速器设施建造的大固角磁谱仪，用于高流强和正向散射角实验，其核心方法包括水平狭缝设计和双层磁屏蔽系统，主要贡献是实现了70msr的固角接受度。
摘要：
在泰勒·杰弗逊国家加速器设施建造了一种用于高流强和正向散射角的大型固角磁谱仪。多个物理实验已使用该谱仪，并已批准了未来实验的显著物理计划。该谱仪概念的关键特征是水平狭缝开口，允许束流线通过磁谱仪磁铁的yoke。这种设计使目标与谱仪之间的距离缩短，从而实现了70~msr的固角接受度。通过双层磁屏蔽系统减少了束流线内狭缝的残留磁通量，外部层由一组铁环组成。在磁铁前后使用了两个校正磁铁，以补偿磁铁yoke外的边缘场的横向分量。靠近目标的高磁铁的机械稳定性通过重物提供了保障。
英文摘要：
A large solid angle magnetic spectrometer for high luminosity and forward scattering angles was constructed at the Thomas Jefferson National Accelerator Facility. A number of physics experiments have used this spectrometer, and a significant physics program of future experiments has already been approved. A key feature of the spectrometer concept is a horizontal slit opening that allows the beamline to pass through the yoke of the spectrometer magnet. This design enables a short distance between the target and spectrometer, resulting in a 70~msr solid angle acceptance. The residual magnetic-field on the beamline inside the slit is reduced by a two-layer magnetic shielding system, with the external layer comprising a set of iron rings. Two correcting magnets, before and after the dipole, were used to compensate for the transverse component of the fringe field outside of the dipole yoke. The mechanical stability of the tall dipole magnet in close proximity to the target was provided by means of a heavy counterweight.
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