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Low-frequency whistler waves in quiescent runaway electron plasmas

机译:低频吹口哨在静态失控电子等离子体中波浪

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In quiescent runaway electron plasmas in the DIII-D tokamak, whistler waves with frequencies between 90 and 200 MHz are driven unstable in plasmas with appreciable hard x-ray and nonthermal electron cyclotron emission (ECE). Narrow (delta f 50 kHz) discrete modes with erratically spaced frequencies are observed. Unstable modes often extend over a range Delta f similar or equal to 50 MHz but lower frequency unstable modes are usually most intense. The dependency of the frequency on field and density implies a wavenumber k similar or equal to 150 m(-1) with parallel wavenumber k parallel to k. Reducing the gap between the plasma and the wall increases the number of detected modes. Lowering the magnetic field promotes instability. Nonlinear limit-cycle-like oscillations in the whistler amplitude occur on a 10 ms timescale. The ECE signals often jump at whistler bursts, suggesting that the modes pitch-angle scatter the runaways. Sawteeth cause transient stabilization of the whistlers.
机译:在DIII-D Tokamak中的静态失控电子等离子体中,在90到200MHz之间的频率波在等离子体中不稳定,具有可观的硬X射线和非热电子回流发射(ECE)。观察到具有不正确间隔频率的窄(Delta F< 50 kHz)离散模式。不稳定模式经常在相似或等于50 MHz的范围ΔF上延伸,但较低的频率不稳定模式通常是最强烈的。频率对场和密度的依赖性意味着波数k类似于或等于150μm(-1),平行波数k平行于& k。减小等离子体和壁之间的间隙增加了检测模式的数量。降低磁场促进不稳定。惠斯勒幅度中的非线性极限循环振荡发生在10ms时分中。 ECE信号经常跳跃在吹口哨突发,表明模式距离角度散射失控。 Sawteeth导致哨声的瞬态稳定。

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