标题： 杰斐逊实验室冻结自旋靶 显示英文标题

标题： The Jefferson Lab Frozen Spin Target

摘要： 一个冻结自旋极化靶，由杰斐逊实验室建造，用于大型接受度光谱仪内部，本文进行了描述。 该靶已被用于使用具有纵向和圆偏振的极化标记光子的光致产率测量。 在光谱仪外部，5 T 和 200–300 mK 条件下，TEMPO掺杂的丁醇中的质子被动态极化至约 90%。 在光谱仪内部，以大约 30 mK 的冻结自旋温度获取了光致产率数据，极化由安装在靶低温恒温器内的薄超导线圈维持。 使用了一个 0.56 T 的螺线管进行纵向靶极化，一个 0.50 T 的偶极子进行横向极化。 观察到的自旋-晶格弛豫时间高达 4000 小时。 我们还报告了掺杂三苯甲基自由基 OX063 的氘代丙二醇的极化结果。 显示英文摘要

摘要： A frozen spin polarized target, constructed at Jefferson Lab for use inside a large acceptance spectrometer, is described. The target has been utilized for photoproduction measurements with polarized tagged photons of both longitudinal and circular polarization. Protons in TEMPO-doped butanol were dynamically polarized to approximately 90% outside the spectrometer at 5 T and 200--300 mK. Photoproduction data were acquired with the target inside the spectrometer at a frozen-spin temperature of approximately 30 mK with the polarization maintained by a thin, superconducting coil installed inside the target cryostat. A 0.56 T solenoid was used for longitudinal target polarization and a 0.50 T dipole for transverse polarization. Spin-lattice relaxation times as high as 4000 hours were observed. We also report polarization results for deuterated propanediol doped with the trityl radical OX063.