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Improvement of Spheromak-Plasma Confinement

Spheromak 等离子体约束的改进

基本信息

批准号：
63580003
负责人：
KANEKO Shobu
金额：
$ 1.41万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

This research program aims to improve the plasma confinement of the spheromak device, CTCC-II, at Osaka University. Through this study, we expect to increase our physical knowledge on the spheromak and plasma physics. We have investigated the following five subjects.1. Stability analysis by the TSC (Princeton Tokamak Simulation Code). 2. Effects, of the central conducting pole and the choking current on the spheromak plasma with flux hole. 3. Effects of the plasma rotation on the plasma equilibrium quantities. 4. Equilibrium and stability of the flux-core spheromak with the pressure gradient. 5. Effects of the current drive using the electron cyclotron resonance absorption.The main results obtained on the above subjects are the following. 1. The spheromak is shown to be stable against the axially symmetric resistive MHD perturbations. The values of the diffusion coefficient and the thermal conductivity should be about 100 times larger than those of the classical (Spitzer's) values to explain experimental results. 2. The stability effects of the central conducting pole depend on the plasma-current distribution. This explains the experimental result on the plasma life time. The plasma confinement is sharply enhanced when the flux hole is generated. The maximum values of beta ratio on the magnetic axis, under which the Mercier criterion is satisfied, is at most 6%. This value is evaluated by use of the optimized pressure distribution. 3. There is a small difference between experimental and theoretical results on the poloidal and toroidal magnetic fields. We can show this difference is qualitatively explained by considering the plasma rotation about its symmetric axis. We have investigated basic problems on the current drive in the subjects 4. and 5.From the above investigations, we have surely achieved the purpose of the research program mentioned above.

本研究计划旨在改善大坂大学的spheromak设备CTCC-II的等离子体约束。通过本研究，我们希望能增加我们对球马克和等离子体物理的认识。我们研究了以下五个问题。TSC（Princeton Tokamak Simulation Code）。2.中心导电极和扼流对带通孔球马克等离子体的影响。3.等离子体旋转对等离子体平衡量的影响。4.压力梯度作用下磁通芯球磁的平衡与稳定性。5.利用电子回旋共振吸收的电流驱动效应。在上述课题上获得的主要结果如下。1.球马克被证明是稳定的轴对称电阻MHD扰动。扩散系数和热导率的值应该比经典的（斯皮策）值大100倍左右，以解释实验结果。2.中心导电极的稳定性效应取决于等离子体电流的分布。这解释了等离子体寿命的实验结果。当磁通孔产生时，等离子体约束急剧增强。满足Mercier判据的磁轴上β比的最大值至多为6%。该值通过使用优化的压力分布来评估。3.极向和环向磁场的实验结果与理论结果有很小的差别。我们可以通过考虑等离子体绕其对称轴的旋转来定性地解释这种差异。在课题4中，我们研究了电流驱动的基本问题。5.通过以上的研究，我们确实达到了上述研究计划的目的。