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Realization of the phase transition of a charged particle beams

带电粒子束相变的实现

基本信息

批准号：
17340079
负责人：
OKAMOTO Hiromi
金额：
$ 10.3万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340079/
关键词：
crystalline beam linear Paul trap nonneutral plasma space-charge effect laser coolinp particle accelerator ion beam クリスタルビームー

项目摘要

The purpose of this study is to demonstrate the realizability of the phase transition of a charged-particle beam circulating in a storage ring. The molecular dynamics (MD) simulation technique was employed to investigate the possibility of beam crystallization. To experimentally explore the collective motion of a high-quality beam, we developed a table-top system 'S-POD (Simulator for Particle Orbit Dynamics)" that consists mainly of a linear Paul trap, a laser cooler high precision ion detectors, a vacuum system, and various power supplies. S-POD enables one to make a systematic study of collective phenomena in space-charge-dominated beams. Experiments of beam cooling were also carried out at the ion storage ring "S-LSR" of Kyoto University The main results obtained during the term of this project are summarized as follows:1. Extensive MD simulations were performed, which demonstrate that multi-dimensional Coulomb crystals can be stabilized in a dispersion-free storage ring without the use of tapered dissipative force2. A Wien filter can naturally extend a longitudinal beam cooling force to the transverse degrees of freedom and, thus, makes it possible to establish a coasting crystalline state when EP beam line density is sufficiently low.3. Results of S-POD experiments indicate that the stability of a high-quality beam in a storage ring may be affected not only by coherent resonance but also by incoherent resonance.4 A laser cooling system and a laser-induced fluorescence diagnostic were designed and constructed for S-POD. Ca" ions were successfully Doppler cooled and formed one-dimensional Coulomb crystals.5. The longitudinal motion of a coasting ^<24>Mg^+beam was laser-cooled in S-LSR (although an ultracold state was not reached due to the lack of transverse dissipation). The one-dimensional ordering of a 7MeV proton beam was observed with an electron cooler switched on.

这项研究的目的是证明在储存环中循环的带电粒子束的相变是可实现的。采用分子动力学(MD)模拟技术研究了束流结晶的可能性。为了从实验上探索高质量束流的集体运动，我们研制了一个桌面系统S-POD(粒子轨道动力学模拟器)，该系统主要由线性Paul陷阱、激光制冷器、高精度离子探测器、真空系统和各种电源组成。S-POD使人们能够系统地研究空间电荷为主的束流中的集体现象。在京都大学的离子储存环“S-LSR”上也进行了束流冷却实验。本项目期间取得的主要结果如下：1.进行了大量的MD模拟，结果表明，多维库仑晶体可以稳定在无色散的储存环中，而不需要使用锥形耗散力。维恩滤光片可以自然地将纵向光束冷却力扩展到横向自由度，从而使在EP束线密度足够低的情况下建立顺行结晶状态成为可能。S-POD的实验结果表明，高质量光束在存储环中的稳定性不仅受相干共振的影响，还受非相干共振的影响。4.为S-POD设计并搭建了激光致冷系统和激光诱导荧光诊断系统。成功地对Ca~(2+)离子进行了多普勒冷却，形成了一维库仑晶体。在S激光加速器中，一束正在滑动的~(24)~(gt；)Mg~(++)光束的纵向运动被激光冷却(尽管由于缺乏横向耗散而没有达到超冷态)。在开启电子制冷器的情况下，观察到了7 MeV质子束的一维有序化。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Feasibility of beam crystallization in a cooler storage ring

冷却器储存环中束流结晶的可行性

DOI：
发表时间：
2005
期刊：
Phys. Rev. ST Accel. Beams 8
影响因子：
0
作者：
R. Sugahara;M. Nozaki;S. Takeda;H. Yamaoka;S. Yamashita and Y. Nakayama;Atsushi Nakamura;Y. Yuri
通讯作者：
Y. Yuri

線形ポールトラップに捕捉したCaイオンプラズマのレーザー冷却実験

线极陷阱中捕获的 Ca 离子等离子体激光冷却实验