Localised Microwave Bursts During ELMs on MAST

Localised Microwave Bursts During ELMs on MAST
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MAST 上 ELM 期间的局部微波爆发

DOI:
10.1051/epjconf/20158703008
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发表时间:
2015
影响因子:
--
通讯作者:
Freethy S
Freethy S
中科院分区:
--
文献类型:
--
作者:
Freethy S

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在百万安培球形托卡马克上的ELM事件期间观察到微波发射的爆发。与其他机器上的观测结果一致,这些爆发比热背景强3个数量级,但本质上是电子回旋。微波发射的峰值在中平面Dα发射的峰值之前约20μ。使用合成孔径微波成像辐射计,我们能够证明,这些突发往往是高度空间本地化,并优先发生在托卡马克中平面。据推测,本地化是一个结果的多普勒共振展宽的电子伯恩斯坦波和高垂直电子能量可能是在高碰撞区域的等离子体的俯仰角散射的结果。
Bursts of microwave emission are observed during ELM events on the Mega Ampère Spherical Tokamak. In agreement with observations on other machines, these bursts are up to 3 orders of magnitude more intense than the thermal background, but are electron cyclotron in nature. The peak in microwave emission is ~20μ before the peak in midplane Dαemission. Using the Synthetic Aperture Microwave Imaging radiometer, we are able to demonstrate that these bursts are often highly spatially localised and preferentially occur at the tokamak midplane. It is hypothesised that the localisation is a result of Doppler resonance broadening for electron Bernstein waves and the high perpendicular electron energies could be the result of pitch angle scattering in high collisionality regions of the plasma.
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