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首页> 外文期刊>Plasma physics and controlled fusion >Observation and modelling of ion cyclotron range of frequencies waves in the mode conversion region of Alcator C-Mod
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Observation and modelling of ion cyclotron range of frequencies waves in the mode conversion region of Alcator C-Mod

机译：Alcator C-Mod模式转换区域中离子回旋加速器频率波范围的观察和建模

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摘要

The fastmagnetosonic wave, mode converted ion cyclotron wave (MC ICW) and mode converted ion Bernstein wave (MC IBW) have all been observed and unambiguously identified in the mode conversion region of Alcator C-Mod. The influences of the species mix, mode conversion location and B-pol/B-tot have been studied in D(He-3) plasmas at B-0 similar to 5.4T (f(RF) = 50 MHz) and B-0 similar to 8 T (f(RF) = 78 MHz). The RF waves were measured by a phase contrast imaging (PCI) system. The experimental observation is compared with the result from a synthetic PCI diagnostic based upon the full wave code TORIC. Good agreement between the observation and modelling has been obtained on the spatial structure of the RF waves. When the mode conversion layer was off axis, both MC ICW and MC IBW were observed. In 5.4 T near-axis mode conversion discharges, the double hump spatial structure of the MC waves was observed experimentally and reproduced by the synthetic PCI. Such a structure is an indication of the up-down asymmetry of the MC ICW. In 8 T near-axis mode conversion discharges, we had the first definitive observation of IBW dominated MC in Alcator C-Mod.
机译：在Alcator C-Mod的模式转换区域中均已观察到并明确标识了快速磁波，模式转换离子回旋波（MC ICW）和模式转换离子伯恩斯坦波（MC IBW）。在类似于5.4T（f（RF）= 50 MHz）和B-0的B-0的D（He-3）等离子体中研究了物种混合，模式转换位置和B-pol / B-tot的影响。类似于8 T（f（RF）= 78 MHz）。射频波是通过相衬成像（PCI）系统测量的。将实验观察结果与基于完整波码TORIC的合成PCI诊断结果进行比较。在射频波的空间结构上，观测与建模之间取得了良好的一致性。当模式转换层偏离轴时，观察到MC ICW和MC IBW。在5.4 T近轴模式转换放电中，实验观察到了MC波的双峰空间结构，并通过合成PCI进行了复制。这样的结构表示MC ICW的上下不对称性。在8 T近轴模式转换放电中，我们首次对Alcator C-Mod中IBW为主的MC进行了确定性观察。

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