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首页> 外文期刊>Nuclear fusion >Observation of spontaneously excited waves in the ion cyclotron frequency range on JT-60U
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Observation of spontaneously excited waves in the ion cyclotron frequency range on JT-60U

机译：JT-60U在离子回旋频率范围内的自发激发波的观测

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In this paper, experimental observations of spontaneously excited waves in the ion cyclotron range of frequency (ICRF) on JT-60U are described. The fluctuations in ICRF are driven by the presence of non-thermal ion distribution in magnetically confined plasmas. Two types of magnetic fluctuations are detected: one is due to high-energy D ions from neutral beam (NB) injections and the other is due to fusion products (FPs) of~3He and T ions. These fluctuations have been reported as ion cyclotron emissions (ICEs) in the burning plasma experiments on large tokamaks. This paper describes the first measurement of the spatial structures of the excited modes in the poloidal and toroidal directions. It is confirmed by using ICRF antennas as pickup loops that all modes excited spontaneously have magnetic components. The modes due to D ions have zero or a small toroidal wave number k_z. On the other hand, the measurement of finite k_z in the modes due to FP ions supports the excitation of the Alfven waves, which is the possible origin of FP-ICEs. It is also observed that the excited modes due to FP ions (~3He and T ions) have different characteristics: driven by different NBs and having different parameter dependences. ICE due to T ions has no harmonics and the value of ω/Ω_(ci) is smaller than that due to ~3He. Both beam-driven ICEs and FP-ICEs are clearly observed and their spatial structures are obtained on JT-60U.
机译：本文描述了在JT-60U上离子回旋加速器频率范围内的自发激发波的实验观察结果。 ICRF的波动是受磁约束等离子体中非热离子分布的驱动。检测到两种类型的磁波动：一种是由于中性束（NB）注入产生的高能D离子，另一种是由于〜3He和T离子的聚变产物（FPs）。在大型托卡马克燃烧等离子体实验中，已将这些波动报告为离子回旋加速器发射（ICE）。本文描述了在极化和环形方向上激发模态空间结构的首次测量。通过使用ICRF天线作为拾取回路可以确认，所有自发激发的模式都具有磁性成分。由D离子引起的模式具有零或小的环形波数k_z。另一方面，在由于FP离子引起的模中有限k_z的测量结果支持了Alfven波的激发，这是FP-ICE的可能起源。还可以观察到，由FP离子（〜3He和T离子）引起的激发模式具有不同的特性：由不同的NB驱动并具有不同的参数依赖性。由于T离子引起的ICE没有谐波，并且ω/Ω_（ci）的值小于由于〜3He而引起的值。可以清楚地观察到光束驱动的ICE和FP-ICE，并在JT-60U上获得了它们的空间结构。

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