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Design Study of a Coupling RF Cavity for Three-Dimensional Laser Cooling

三维激光冷却耦合射频腔的设计研究

基本信息

批准号：
09554011
负责人：
OKAMOTO Hiromi
金额：
$ 7.17万
依托单位：
Hiroshima University (1998-1999)Kyoto University (1997)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09554011/
关键词：
Laser Cooling Storage Ring Crystalline Beam Coupling Cavity Tapered Cooling

项目摘要

The purpose of this project is to develop a novel three-dimensional laser cooling scheme for fast stored ion beams. The main results obtained during the term of the project are :1. It has been numerically demonstrated, with the tracking code "SAD" and molecular dynamics code "SOLID", that longitudinal laser cooling force can be extended to the transverse degrees of freedom of beam motion by employing the resonant coupling method.2. A low-power model of coupling RF cavity was designed and fabricated.3. It has been shown that the storage-ring lattice suitable for beam crystallization must satisfy the following two conditions : (a). the phase advance of betatron oscillation per lattice period is below about 127 degrees, and (b). the beam energy is less than the transition energy of the ring.4. Provided that the above-mentioned conditions are fulfilled, it is possible to produce an ultra-cold beam by means of the resonant coupling method.5. The relation between intra-beam heating rate and the amount of focusing field errors was studied.6. It has been concluded that, in order to stabilize a crystalline beam, a tapered cooling force is necessary.7. In order to generate a tapered light, a possible cooling scheme using multiple lasers has been proposed, and its validity was tested with molecular dynamics simulations.

该项目的目的是开发一种用于快速存储离子束的新型三维激光冷却方案。项目期间取得的主要成果有： 1．利用跟踪代码“SAD”和分子动力学代码“SOLID”数值证明，采用共振耦合方法，纵向激光冷却力可以扩展到光束运动的横向自由度。 2．设计并制作了耦合射频腔的低功耗模型。 3．已经表明，适合束流结晶的储存环晶格必须满足以下两个条件：(a)．每个晶格周期的电子感应加速器振荡的相位超前低于约127度，以及(b)。光束能量小于环的跃迁能量。4．只要满足上述条件，就可以利用谐振耦合法产生超冷束。 5．研究了束内加热速率与聚焦场误差量的关系。 6．得出的结论是，为了稳定晶体梁，锥形冷却力是必要的。7．为了产生锥形光，提出了一种可能的使用多个激光器的冷却方案，并通过分子动力学模拟测试了其有效性。