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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.

本研究的目的是证明在存储环中循环的带电粒子束的相变的可实现性。采用分子动力学（MD）模拟技术来研究束结晶的可能性。为了实验探索高质量光束的集体运动，我们开发了一种桌面系统“S-POD（粒子轨道动力学模拟器）”，主要由线性保罗陷阱、激光冷却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主导光束中的集体现象。光束冷却实验是也在京都大学的离子存储环“S-LSR”上进行了该项目期间取得的主要成果概括如下： 1．进行了广泛的 MD 模拟，表明多维库仑晶体可以在无色散存储环中稳定，而无需使用锥形耗散力2。维恩滤波器可以自然地将纵向梁冷却力延伸到横向梁自由度，因此，当EP束线密度足够低时，可以建立滑行晶态。 3． S-POD实验结果表明，存储环中高质量光束的稳定性不仅会受到相干共振的影响，还会受到非相干共振的影响。4针对S-POD设计并构建了激光冷却系统和激光诱导荧光诊断系统。钙” 离子成功被多普勒冷却并形成一维库仑晶体。 5．滑行^ 24 Mg ^+ 梁的纵向运动在S-LSR中被激光冷却（尽管由于缺乏横向耗散而没有达到超冷状态）。在打开电子冷却器的情况下观察了 7MeV 质子束的一维有序性。

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