Generating ultralow-emittance ion beams in a storage ring.
Generating ultralow-emittance ion beams in a storage ring.
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DOI：
10.1103/physrevlett.93.204801
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发表时间：
2004-11
影响因子：
8.6
通讯作者：
Y. Yuri;H. Okamoto
中科院分区：
文献类型：
--
作者：
Y. Yuri;H. Okamoto
用多粒子模拟程序系统地研究了储存环中重离子束的激光冷却，其中不仅可以考虑精确的晶格特征和空间电荷力，而且可以考虑真实的激光-离子相互作用。采用共振耦合的方法，将强大的纵向光子压强扩展到横向自由度。结果表明，尽管存在空间电荷引起的调谐漂移，但快速抑制横向振荡所需的同步倍增共振机制在整个冷却过程中运行。因此，对储存的离子束进行极高效的三维冷却是可行的。结果表明，在低线密度条件下，仅采用现有技术，三个方向的归一化均方根发射率均可达到10(-12)mrad量级。
Laser cooling of heavy-ion beams in a storage ring is systematically studied with a multiparticle simulation code where not only exact lattice characteristics and space-charge forces but also realistic laser-ion interactions can be incorporated. The resonant coupling method is applied in order to extend the powerful longitudinal photon pressure to the transverse degrees of freedom. It is shown that, in spite of a space-charge-induced tune shift, the synchrobetatron resonance mechanism required for fast damping of transverse oscillations operates throughout the cooling process. Extremely efficient three-dimensional cooling of stored ion beams is thus feasible. It is demonstrated that, at low line density, normalized root-mean-squared emittances of the order of 10(-12) m.rad can be reached in all three directions by employing only existing technologies.