Transverse laser cooling induced through dispersion at an rf cavity.
Transverse laser cooling induced through dispersion at an rf cavity.
复制标题
通过射频腔的色散引起横向激光冷却。
DOI：
10.1103/physreve.50.4982
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Okamoto
中科院分区：
文献类型：
--
作者：
Okamoto
提出了一种实现储存环中储存和循环离子束三维激光冷却的可能方案。这个想法是基于创建一个线性的同步感应加速器耦合，使得纵向激光冷却效果可以通过耦合扩展到横向自由度。最近研究了间接横向激光冷却的想法，采用所谓的[重要耦合] [重要腔]作为强迫耦合的来源。在本文中，我们从理论上探讨了使用环的自然色散作为替代耦合源的可能性，设置在非零色散的位置的射频腔。结果表明，色散诱导耦合的作用与耦合腔的作用基本等效，在谐振条件下，耦合作用可得到显著增强。计算了纵模和横模的冷却率。导出了一个近似公式，以估计在腔的位置处的色散的最佳值。目前的理论预测的有效性证实了跟踪模拟，证明有效的横向激光冷却。
We propose a possible scheme to realize three-dimensional laser cooling of stored and circulating ion beams in a storage ring. The idea is based on creating a linear synchrobetatron coupling such that the longitudinal laser cooling effect can be extended to transverse degrees of freedom through the coupling. The idea of indirect transverse laser cooling was recently studied, employing a so-called [ital coupling] [ital cavity] as a source of the forced coupling. In the present paper, we theoretically explore the possibility of using natural dispersion of a ring as an alternative coupling source, setting an [ital ordinary] rf cavity at a position with nonzero dispersion. It is found that the effect of the dispersion-induced coupling is essentially equivalent to that of the coupling cavity, and that the coupling can be considerably enhanced under resonance conditions. The cooling rates of longitudinal and transverse modes are evaluated. An approximate formula is derived to estimate an optimum value of dispersion at the cavity location. The validity of the present theoretical predictions is confirmed by tracking simulations that demonstrate effective transverse laser cooling.