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Controlled Experiment on Self-organization of Many-particle System Using Non-neutral Plasmas

非中性等离子体多粒子系统自组织受控实验

基本信息

批准号：
11480107
负责人：
KIWAMOTO Yasuhito
金额：
$ 9.98万
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：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11480107/
关键词：
non-neutral plasma vortex vortex crystal vortex merging self-organization nonlinear structure image diagnostics

项目摘要

With a newly developed emitter array of 19 cathodes for producing electron strings with 1mm in diam. and 230mm in length, we have successfully produced various shapes of electron density distribution, discrete and/ or continuous. An interesting feature of 2-dimensional dynamics of axially homogeneous electron strings is that the system dynamics is equivalent to incompressible Euler fluid and the electron density is proportional to the vorticity. Combining the dynamics control with a high-resolution and high-sensitivity imaging technique, we have achieved several findings on the vortex dynamics.(a) Dynamics of the discrete electron strings follows the Hamiltonian description of the vortex string system. [J.Phys.Soc.Jpn.Lett.Vol.68 (1999) 3766.](b) A low level of the background vorticity accelerates merging between vortex strings.[ibid.](c) A vortex string moves up the gradient of the background vortex distribution. [6](d) A series of crystal states of discrete vortex arrays appear in the relaxation process of the initially 19 strings that show stochastic motions and inelastic collisions.[1,2,4, to be published.](e) Patches and rings of depleted zone (holes) in the background vortex distribution have strong influences on the dynamics of eminent vortex strings and on the process of crystallization.[1,2,4, to be published.](f) The vorticity is found experimentally to be functionally expressed in terms of the stream function as the system approaches to the equilibrium state.[3, to be published.](g) Many statistical variables, including energy, angular momentum, circulation, enstrophy, entropy etc., are obtained from the experimental data and given as a function of time along relaxation.

用新研制的19个阴极的发射极阵列产生直径为1 mm的电子串。和230毫米长，我们已经成功地产生了各种形状的电子密度分布，离散和/或连续。轴向均匀电子弦的二维动力学的一个有趣的特点是，系统动力学等价于不可压缩的欧拉流体，电子密度与涡量成正比。结合高分辨率和高灵敏度的成像技术的动力学控制，我们已经取得了一些研究结果的旋涡动力学。(a)离散电子弦的动力学遵循涡弦系统的哈密顿描述。[J. Phys.Soc.Jpn.Lett.Vol.68（1999）3766.] (b)低水平的背景涡度加速了涡串间的合并。[同上] (c)涡串沿背景涡分布梯度向上移动。[6]（d）在最初的19根弦的松弛过程中出现了一系列离散涡旋阵列的晶体状态，这些弦表现出随机运动和非弹性碰撞。[1，2，4，待公布] (e)背景涡分布中的斑片和环的贫化区（孔）对突出涡串的动力学和结晶过程有很大的影响。[1，2，4，待公布] (f)实验发现，涡度的函数表示的流函数作为系统接近平衡状态。[3]待公布。(g)许多统计变量，包括能量、角动量、环流、涡度拟能、熵等，从实验数据中获得，并作为沿着弛豫时间的函数给出。