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Self-Orgamzation in Low-Aspect Ratio Tens Plasma and Healing of Magnetic Chaos

低纵横比数十等离子体中的自组织与磁混沌的治愈

基本信息

批准号：
17360441
负责人：
MASAMUNE Sadao
金额：
$ 10.05万
依托单位：
Kyoto Institute of Technology
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

项目摘要

In this research project, we have constructed an RFP machine RELAX, whose aspect ratio (A) is 2, the world's lowest value to date. During its 1st phase operation for about a year the following discharge parameters have been achieved: maximum plasma current of <80kA, minimum discharge resistance of 1 mΩ discharge duration longer than 2 ms with RFP configuration sustained for L5-2 ms. The MHD characteristics of low-ARFP plasmas can be summarizes as follows. In flat-topped discharges, we have observed two types of toroidal mode spectrum of the m=1 modes depending upon the discharge phases. In the later phase, where the magnetic fluctuation level tends to be the lowest, the edge magnetic fluctuation has a characteristic of multi-helicity (MH) state with dominant core resonant m=1/n=4,5 modes. In the early to mid phase, periodic growth and decay of a low-amplitude (but higher than in the later phase) single mode, either n=4 or n=5, has been observed. In round-topped RFP discharges, a m=1/n= … More 4 single dominant mode tends to grow quasi-periodically with suppression of the neighboring modes, and the toroidal mode spectrum has the quasi-single helicity (QSH) characteristic with dominant mode amplitude higher than in other RFP experiments. These observations are in agreement with theoretical predictions from low-ARFP equilibrium profiles. In RELAX, the self-reversal mode operation has also become possible, which discharge is characterized by a large-scale change in magnetic field profile. The measured profiles of asymmetric components are in good agreement with those of Helical Ohmic Equilibrium (HOE), in which RFP configuration is sustained without magnetic chaos. The measured oscillation may be an indication of toroidal rotation of the HOE configuration. A new equilibrium reconstruction code, RELAXFit, has been developed. We have extended the operation regime of the MSTFit code to the lower-A regime. This work has been performed as a part of US-Japan Fusion Collaboration Program. In the RELAXFit, we have taken into account the neoclassical effect in order to estimate the bootstrap current in RELAX. Throughout this research project, we have established the basis for further experimental study of low-A RFP configuration, a new regime of toroidal plasmas. Less

在本研究项目中，我们构建了一台RFP机器RELAX，其纵横比(A)为2，是迄今为止世界上最低的值。在一期运行约一年的时间里，获得了以下放电参数：最大等离子体电流80kA，最小放电电阻1mRFP，放电持续时间超过2ms，Ω构型保持15-2ms。低ARFP等离子体的磁流体特性可以概括如下。在平顶放电中，我们观察到了取决于放电相位的两种类型的m=1模的环形模谱。在磁涨落能级趋于最低的后期，边缘磁涨落具有多螺旋度(MH)态的特征，中心共振m=1/n=4，5模。在早期到中期，观察到低幅度(但高于后期)单模的周期性增长和衰变，n=4或n=5。在圆顶RFP放电中，a m=1/n=…随着相邻模的抑制，多个单主模趋于准周期增长，环形模谱具有准单螺旋度(QSH)特征，主模幅度高于其他RFP实验。这些观测结果与低ARFP平衡剖面的理论预测是一致的。在RELAX中，自反转模式也成为可能，放电的特征是磁场分布的大范围变化。测量的非对称成分的轮廓与螺旋欧姆平衡(HOE)的轮廓很好地吻合，在HOE中RFP构型保持不变，没有磁混沌。所测量的振荡可以是HOE结构的环形旋转的指示。开发了一个新的平衡重构程序RELAXFit。我们已将MSTFit规则的操作规则扩展到低A规则。这项工作是作为美日融合合作计划的一部分进行的。在RELAXFit中，我们考虑了新经典效应，以估算RELAX中的自举电流。在整个研究项目中，我们为进一步的实验研究环状等离子体的一种新区域--Low-A RFP构型奠定了基础。较少

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）

Quasi-Peroidic Growth of a Single Mode in a Low-Aspect Ration RFP

低纵横比 RFP 中单模的准周期性生长

DOI：
发表时间：
2008
期刊：
Plasma Fusion Res. 3(印刷中)
影响因子：
0
作者：
R. Ikezoe;T. Onchi;A. Sanpei;H. Himura;S. Masamune,
通讯作者：
S. Masamune,

Research Plans for Low-Aspect Ratio Reversed Field Pinch

低纵横比反向视场挤压的研究计划

DOI：
发表时间：
2007
期刊：
Transacitons on Fusion Science and Technology 51
影响因子：
0
作者：
S. Masamune;A. Sanpei;H. Himura;R. Ikezoe;T. Onchi;M. Nagata;H. Hiramatsu;D. ishijima
通讯作者：
D. ishijima

Probing of Toroidal Electron Plasmas Confined on Helical Magnetic Surfaces

限制在螺旋磁表面上的环形电子等离子体的探测