Study on the elucidation of appearance and growth mechanism of magnetic islands and their active control in torus plasmas

环形等离子体中磁岛的出现、生长机制及其主动控制的阐明研究

• 批准号: 22760662
• 负责人: ISAYAMA Akihiko
• 金额: $ 2.41万
• 依托单位: Japan Atomic Energy Agency
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22760662/
• 关键词: 磁気島; テアリングモード; 電磁流体力学的不安定性; 電子サイクロトロン波; トカマク; プラズマ; 核融合; 不安定性; 電流駆動; 新古典テアリングモード; MHD

Structure of magnetic islands associated with neoclassical tearing modes (NTMs) during their onset and evolution has been investigated. The NTM islands were found to be triggered by a small collapse associated with another instability, in addition to onset without detectable instabilities. It was found that the value of the normalized beta for the collapse-triggered NTM is larger than that for the trigger-less NTM, and that the pressure gradient at the mode location is steeper for the former case. The magnetic island width at which the plasma rotation suddenly slows down is larger than that at the plasma starts to rotate after the island width is decreased. This indicates that there is a hysteresis in the island width for mode locking and unlocking. The development of a device for active control of magnetic islands, a dual-frequency gyrotron, has made progressed, and a good prospect has been obtained toward the achievement of its nominal values.

研究了新古典主义撕裂模(NTM)开始和演化过程中的磁岛结构。NTM岛被发现是由一次与另一次不稳定有关的小坍塌触发的，除了开始时没有检测到不稳定。结果表明，有坍塌触发的NTM的归一化β值大于无触发的NTM的归一化β值，且前者的模式位置的压力梯度更陡峭。等离子体自转突然减慢的磁岛宽度大于减小磁岛宽度后等离子体开始自转时的磁岛宽度。这表明模式锁定和解锁的孤岛宽度中存在滞后。磁岛主动控制装置--双频回旋管的研制取得了进展，实现其标称值具有良好的前景。

项目成果

Progress in the Development of JT-60SA toward Steady-State High-Beta Plasma Research

JT-60SA稳态高β等离子体研究进展

• 发表时间: 2013
• 作者: G. Giruzzi;J. Garcia;N. Hayashi;et al.;A. Isayama
• 通讯作者: A. Isayama

Progress in the Development of the ECRF System for JT-60SA

JT-60SA ECRF系统开发进展

• 发表时间: 2012
• 期刊: Fusion Energy 2012(Proceedings of 24th IAEA Fusion Energy Conference, San Diego, the United States of America)
• 作者: A. Isayama;T. Kobayashi;S. Moriyama;K. Yokokura;M. Shimono;M. Sawahata;S. Suzuki;M. Terakado;S. Hiranai;K. Wada;J. Hinata;Y. Sato;K. Hoshino;K. Sakamoto;K. Kajiwara;Y. Oda;K. Hamamatsu;M. Saigusa and C. Sozzi
• 通讯作者: M. Saigusa and C. Sozzi

Overview of JT-60U Results Toward the Resolution of Key Physics and Engineering Issues in ITER and JT-60SA

JT-60U 解决 ITER 和 JT-60SA 关键物理和工程问题的结果概述

• 发表时间: 2011
• 期刊: Nuclear Fusion
• 影响因子: 3.3
• 作者: M. Oyaidzu;K. Isobe;T. Hayashi;T. Yamanishi;A. Isayama;N. Oyama;小柳津誠;近木祐一郎;A. Isayama and the JT-60 team
• 通讯作者: A. Isayama and the JT-60 team

JT-60UにおけるNTM磁気島のプラズマ回転への影響

NTM磁岛对JT-60U等离子体旋转的影响

• 发表时间: 2010
• 作者: 諌山明彦;他
• 通讯作者: 他

Recent Results from the Development of the Electron Cyclotron Heating System for JT-60SA toward High-power Long-Pulse Operations

JT-60SA 电子回旋加热系统朝着高功率长脉冲运行方向发展的最新成果

• 发表时间: 2012
• 期刊: Plasma and Fusion Research
• 影响因子: 0.8
• 作者: A. Isayama;T. Kobayashi;K. Yokokura;M. Shimono;M. Sawahata;S. Suzuki;M. Terakado;S. Hiranai;K. Wada;J. Hinata;Y. Sato;K. Hoshino;S. Moriyama;K. Sakamoto and K. Hamamatsu
• 通讯作者: K. Sakamoto and K. Hamamatsu