Wave Excitation in Magnetically Confined Plasmas with an Anisotropic Velocity Distribution
Wave Excitation in Magnetically Confined Plasmas with an Anisotropic Velocity Distribution
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DOI：
10.13182/fst07-a1337
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发表时间：
2007-02
影响因子：
0.9
通讯作者：
M. Ichimura;H. Higaki;S. Kakimoto;Y. Yamaguchi;K. Nemoto;M. Katano;I. Kozawa;H. Muro;M. Ishikawa;S. Moriyama;T. Suzuki;T. Watanabe;T. Cho
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文献类型：
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作者：
M. Ichimura;H. Higaki;S. Kakimoto;Y. Yamaguchi;K. Nemoto;M. Katano;I. Kozawa;H. Muro;M. Ishikawa;S. Moriyama;T. Suzuki;T. Watanabe;T. Cho
在磁约束等离子体中，离子回旋频率范围（ICRF）的波动将由非热离子能量分布的存在所驱动。在一个典型的放电中的伽马10串联镜，阿尔文离子回旋（AIC）模式自发激发，由于强烈的温度各向异性。另一方面，在具有环形配置的聚变导向装置中，中性束（NB）注入通常用于产生高性能等离子体。由此产生的高能离子被捕获在局域镜中，并将形成具有强各向异性的速度分布。特别是在JET和TFTR的燃烧等离子体实验中，聚变产物离子（FP）在体相等离子体中形成非热离子能量分布，并观察到离子回旋辐射（ICE）。本文的主要目的是研究在非热能分布的磁约束等离子体中，AIC模和ICE之间的关系。最近，已经开始使用ICRF天线作为JT-60 U上的拾取回路进行波动测量。当氘-NBs注入到氘体等离子体中时，检测到由于注入束和FP离子引起的磁波动。实验研究了非热离子能量分布等离子体中离子回旋频率及其高次谐波附近的波激发。
In magnetically confined plasmas, fluctuations in the ion cyclotron range of frequency (ICRF) will be driven by the presence of non-thermal ion energy distributions. In a typical discharge in the GAMMA 10 tandem mirror, Alfvén-ion-cyclotron (AIC) modes are spontaneously excited due to strong temperature anisotropy. On the other hand, in fusion-oriented devices with a toroidal configuration, neutral beam (NB) injection is commonly used to create high performance plasmas. The resultant high-energy ions are trapped in local mirrors and will form velocity distributions with strong anisotropy. Especially in burning plasma experiments on JET and TFTR, fusion-product (FP) ions form non-thermal ion energy distributions in the bulk plasma and ion cyclotron emission (ICE) has been observed. The main purpose of this work is to study the relation between AIC-modes and ICEs in magnetically confined plasmas with non-thermal energy distributions. Recently, fluctuation measurements made by using ICRF antennas as pickup loops on JT-60U have been started. When the deuterium-NBs are injected into deuterium bulk plasma, magnetic fluctuations due to injected beams and FP ions are detected. Wave excitation near the ion cyclotron frequency and its higher harmonics is studied experimentally in plasmas with non-thermal ion energy distributions.