High density polarized hydrogen gas target for storage rings
High density polarized hydrogen gas target for storage rings
复制标题
用于存储环的高密度极化氢气靶
DOI：
10.1063/1.1146388
复制
发表时间：
1995
影响因子：
1.6
通讯作者：
W. Haeberli
中科院分区：
文献类型：
--
作者：
K. Zapfe;B. Braun;H.;M. Grieser;B. Povh;M. Rall;E. Steffens;F. Stock;J. Tonhäuser;C. Montag;F. Rathmann;D. Fick;W. Haeberli
通过将极化氢原子（由Stern-Gerlach自旋分离产生）注入由两端打开的圆柱形管组成的存储单元中，形成气态极化氢靶。将靶材置于贮存环中，研究靶材的特性（核极化、靶材厚度、抗辐射性能）。采用弱横向引导场（5g）确定偏振方向。当选择处于单一超精细态的原子时，测得目标的核极化为0.80±0.02。在这些条件下，靶材的面密度为（5.5±0.2）×1013 H/cm2，而在两种自旋状态下（适用于高能环中可以对靶材施加强磁场的实验），靶材厚度为（8.2±0.3）×1013 H/cm2。当目标长时间暴露在高达1ma的光束下时，目标偏振不受影响。
A target of gaseous polarized hydrogen was formed by injecting polarized hydrogen atoms (produced by Stern–Gerlach spin separation) into a storage cell consisting of a cylindrical tube open at both ends. The target was placed in a storage ring to study the target characteristics (nuclear polarization, target thickness, radiation resistance). A weak transverse guide field (5 G) was applied to define the polarization direction. When atoms in a single hyperfine state were selected, the nuclear polarization of the target was measured to be 0.80±0.02. The areal density of the target under these conditions was (5.5±0.2)×1013 H/cm2, while for two spin states (applicable to experiments in high energy rings where a strong magnetic field can be applied to the target) the target thickness was found to be (8.2±0.3)×1013 H/cm2. The target polarization was unaffected by prolonged exposure of the target to beams up to 1 mA.