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DENSITY CONTROL OF A FIELD-REVERSED CONFIGURATION

场反转配置的密度控制

基本信息

批准号：
04680018
负责人：
NOGI Yasuyuki
金额：
$ 1.34万
依托单位：
NIHON UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04680018/
关键词：
FIELD-REVERSEO CONFIGURATION PLASMA REVERSED FIELD CONFIGURATION COMPACT TORUS COMPACT TORUS PLASMA HIGH BETA PLASMA PLASMA PRODUCTION THETA PINCH プラズマ移送コンパクトトーラスプラズマ

项目摘要

The electron density of a field-reversed configuration(FRC) plasma must be reduced about one order of the magnitude on the present experiment to make effective a neutral beam heating in an FRC reactor. Operating density in an FRC is controlled bya Paschen's law concerning to gas breakdown letween elecrodes. So it is difficult to produce the plasma at the pressure lower than the minimum of the gas breakdown.We propose a new method to generate an FRC with the density below the minimum. It is that the initial plasma which is produced above the minimum is decreased by a loss from the coil ends. The low density plasma produced by this method is used to form the FRC.The density limit of the FRC is changed from 2X10^<21>m^<-3> to 9x10^<20>m^<-3> in our experiment. If this method is applied to a large machine which was operated till now. it is possible that the target plasma to a neutral beam heating can be prepared at a density of 4x10^<20>m^<-3>. The plasma temperature goes up from 400eV to … More 900eV by ablove density change. This strong corellation between the temperature and the density is easily explained by a beta-1 condition on the FRC plasma.As the plasma parameter range treated in our machine becomes broad, other subjects to be needed in a FRC reactor are studied. These are a formation of an FRC with a high poloidal flux, a translation and a merging of FRCs. A new rheta-coil, named a control coil, is installed between the discharge tube and the rheta-pinch-coil for these experiments. The FRC becomes fat by application of a magnetic pressure of the control coil to the both ends of the FRC and has a twice of the poloidal flux without the control coil. On the translation experiment it becomes possible that an FRC can be moved at speed of 50km/s inthe same field strength as the formation region. Two FRCs are accerelated to collide each other by the control coil and are merged into one FRC.The merging process is quickly completed for 10-15mu s, of which time is preferable to a refuering in a reactor. These experiments will be tried again in quasistatic field, of which machine is constructed now. Less

在本实验中，场反转配置（FRC）等离子体的电子密度必须降低大约一个数量级，才能在 FRC 反应器中有效地进行中性束加热。 FRC 中的工作密度由有关气体击穿电极的帕邢定律控制。因此很难在低于气体击穿最小值的压力下产生等离子体。我们提出了一种产生密度低于最小值的FRC的新方法。这是由于线圈端部的损耗而减少了在最小值以上产生的初始等离子体。通过该方法产生的低密度等离子体用于形成FRC。在我们的实验中，FRC的密度极限从2X10^<21>m^<-3>变为9x10^<20>m^<-3>。如果将此方法应用于至今运行的大型机器。可以以4×10^20m^-3的密度制备用于中性束加热的目标等离子体。通过上述密度变化，等离子体温度从 400eV 上升至 900eV。温度和密度之间的这种强烈的相关性可以很容易地用 FRC 等离子体上的 beta-1 条件来解释。随着我们机器中处理的等离子体参数范围变得广泛，我们对 FRC 反应器中需要的其他主题进行了研究。这些是具有高极向通量的 FRC 的形成、FRC 的平移和合并。在这些实验中，在放电管和稀土夹紧线圈之间安装了一个新的稀土线圈，称为控制线圈。通过将控制线圈的磁压力施加到FRC的两端，FRC变胖，并且具有没有控制线圈时的极向通量的两倍。在平移实验中，FRC可以在与地层区域相同的场强下以50km/s的速度移动。两个FRC通过控制线圈加速相互碰撞，合并为一个FRC。合并过程在10-15μs内快速完成，这一时间比在反应堆中重新熔化要好。这些实验将在准静态场中再次进行，现在已经建造了准静态场。较少的