Precision Lamb-shift polarimeter for polarized atomic and ion beams
Precision Lamb-shift polarimeter for polarized atomic and ion beams
复制标题
用于偏振原子束和离子束的精密兰姆位移旋光计
DOI：
10.1063/1.1619550
复制
发表时间：
2003
影响因子：
1.6
通讯作者：
A. Vassiliev
中科院分区：
文献类型：
--
作者：
R. Engels;R. Emmerich;J. Ley;G. Tenckhoff;H. Schieck;M. Mikirtytchiants;F. Rathmann;H. Seyfarth;A. Vassiliev
这里所描述的Lamb-shift偏振计能够在几秒钟内以优于1%的绝对精度测量氢（氘）原子束或慢质子（氘）束的偏振。旋光仪测量了自旋过滤器中选择的亚稳超精细子态斯塔克猝灭后的莱曼-α跃迁强度比。为此目的，氢（氘）原子在Glavish型电离器中电离。通过铯蒸气中质子（氘）的电荷交换，产生亚稳态2S原子。对于3×1016原子/秒的氢束，光电倍增管中记录了103 ×106光子/秒，即，旋光仪效率约为10 - 10。莱曼-α光谱中的信号背景比非常好，因此光束强度小一到两个数量级仍然足以进行精确测量。偏振计的不同组件以几种方式影响所测量的偏振。它是，t...
The Lamb-shift polarimeter described here enables the polarization of a beam of hydrogen (deuterium) atoms, or of a slow proton (deuteron) beam, to be measured with an absolute precision better than 1% within a few seconds. The polarimeter measures the intensity ratios of Lyman-α transitions after Stark quenching of metastable hyperfine substates that were selected in a spin filter. For that purpose the hydrogen (deuterium) atoms are ionized in a Glavish-type ionizer. By charge exchange of the protons (deuterons) in cesium vapor, atoms in the metastable 2S state are produced. For a hydrogen beam of 3×1016 atoms/s, ∼3×106 photons/s are registered in a photomultiplier, i.e., the polarimeter efficiency is about 10−10. The signal-to-background ratio in the Lyman-α spectrum is excellent, thus beam intensities of one to two orders of magnitude less would still be sufficient to carry out a precise measurement. The different components of the polarimeter affect the measured polarization in several ways. It was, t...