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首页> 外文期刊>Nuclear fusion >ALFVENIC BEHAVIOUR OF ALPHA PARTICLE DRIVEN ION CYCLOTRON EMISSION IN TFTR
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ALFVENIC BEHAVIOUR OF ALPHA PARTICLE DRIVEN ION CYCLOTRON EMISSION IN TFTR

机译：TFTR中α粒子驱动离子回旋辐射的尾气行为

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摘要

Ion cyclotron emission (ICE) has been observed during D-T discharges in the Tokamak Fusion Test Reactor (TFTR), using RF probes located near the top and the bottom of the vacuum vessel. Harmonics of the alpha cyclotron frequency (Ω_α) evaluated at the outer midplane plasma edge are observed at the onset of the beam injection phase of TFTR supershots and persist for approximately 100-250 ms. These results are in contrast with observations of ICE in JET, in which harmonics of Ω_α evolve with the alpha population in the plasma edge. Such differences are believed to be due to the fact that newly born fusion alpha particles are super-Alfvenic near the edge of JET plasmas, while they are sub-Alfvenic near the edge of TFTR supershot plasmas. In TFTR discharges with edge densities such that newly born alpha particles are super-Alfvenic, alpha cyclotron harmonics are observed to persist. These results are in qualitative agreement with numerical calculations of growth rates due to the magnetoacoustic cyclotron instability.
机译：在Tokamak聚变测试反应堆（TFTR）的D-T放电过程中，使用位于真空容器顶部和底部附近的RF探针观察到离子回旋辐射（ICE）。在TFTR超级射束的射束注入阶段开始时观察到了在外中平面等离子边缘处评估的α回旋加速器频率（Ω_α）的谐波，并持续了大约100-250 ms。这些结果与JET中ICE的观察结果相反，在ICE中，Ω_α的谐波随等离子体边缘中的α填充而演化。认为这种差异是由于这样的事实，即新生的融合α粒子在JET等离子体边缘附近是超级Alfvenic，而在TFTR supershot等离子体边缘附近是次Alfvenic。在具有边缘密度的TFTR放电中，例如新生α粒子是超Alfvenic的，观察到α回旋加速器谐波持续存在。由于磁声回旋加速器的不稳定性，这些结果与增长率的数值计算在质量上吻合。

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