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Controlled non-neutral-plasma experiment on fundamental processes in transport and relaxation to equilibrium states of a many-charged-particle system.

关于多带电粒子系统的传输和弛豫到平衡状态的基本过程的受控非中性等离子体实验。

基本信息

批准号：
17340173
负责人：
KIWAMOTO Yasuhito
金额：
$ 10.05万
依托单位：
Kyoto 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 2006
项目状态：
已结题

项目摘要

Major achievements of this project are summarized in three categories :(1) Experimental analysis of vortex dynamics in terms of two-dimensional (2D) turbulence :Spectral analyses are carried out on the vortex structures appearing during the relaxation of unstable initial density distribution of a magnetized pure electron plasma. The ensemble of guiding centers of electrons is morphologically equivalent to 2D fluid and its density is proportional vorticity. Increasingly fine structures in the low-density population in the real space represent cascading in the wave-number space, downward in energy and upward in enstrophy. [JPSJ (2006), Phys.Rev.E (2007)](2) Experimental and theoretical analyses of wave-induced transport :Rotating Trivelpiece-Gould mode wave is identified to strongly induce the radial transport of magnetized electrons. The radial drift is associated with the axial acceleration of resonant electrons so that the radial transport and the axial heating represent two paths of Landau-damping wave energy. Predictions of the quasi-linear theoretical model are quantitatively confirmed on the observational basis. [Phys.Plasmas (2005, 2006)](3) Construction of 3D distribution of an equilibrium pure electron plasma in a Penning trap :Fast scheme for the 3D distribution from observed 2D image data is successfully applied to reveal fine structures in a low-density population surrounding a high-density core distribution. The potential distribution of self-field is skillfully utilized to evaluate the electron temperature approaching the room temperature only by extracting less than 1% of total particles. [Phys.Plasmas (2006)]

（1）二维湍流涡旋动力学的实验分析：对磁化纯电子等离子体不稳定初始密度分布弛豫过程中出现的涡旋结构进行了谱分析。电子导引中心系综在形态上等价于二维流体，其密度为比例涡。在真实的空间中，低密度粒子群中越来越精细的结构代表了波数空间中的级联，能量向下，涡度拟能向上。[JPSJ（2006），Phys.Rev.E（2007）]（2）波诱导输运的实验和理论分析：旋转Trivelpiece-Gould模式波被识别为强烈诱导磁化电子的径向输运。径向漂移与共振电子的轴向加速有关，因此径向输运和轴向加热代表了朗道阻尼波能量的两条路径。准线性理论模型的预测在观测的基础上得到了定量的证实。[Phys.Plasmas（2005，2006）]（3）Penning阱中平衡纯电子等离子体的三维分布的构建：从观察到的二维图像数据的三维分布的快速方案被成功地应用于揭示围绕高密度核心分布的低密度粒子群中的精细结构。巧妙地利用自场的势分布，仅需提取不到1%的总粒子，就能估算出接近室温的电子温度。05 The Dog（2006）