Identification of waves in the lower-hybrid frequency range in the scrape-off layer plasma of Alcator C-Mod

被引：2

作者：

Shinya, Takahiro ^{[1
]}

Baek, Seung Gyou ^{[2
]}

Wallace, Gregory M. ^{[2
]}

Shiraiwa, Syun'ichi ^{[2
]}

Takase, Yuichi ^{[1
]}

Parker, Ronald R. ^{[2
]}

Bonoli, Paul T. ^{[2
]}

Brunner, Dan ^{[2
]}

Faust, Ian ^{[2
]}

LaBombard, Brian L. ^{[2
]}

Wukitch, Steve ^{[2
]}

机构：

[1] Univ Tokyo, Kashiwa, Chiba 2778561, Japan

[2] MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA

来源：

NUCLEAR FUSION | 2017年 / 57卷 / 03期

关键词：

tokamak; lower hybrid wave; wave measurement; SOL;

D O I：

10.1088/1741-4326/57/3/036005

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Polarization resolved measurements of the parallel refractive index N-parallel to equivalent to ck(parallel to)/w of the driven RF waves in the lower hybrid (LH) range of frequencies are performed using arrays of RF magnetic probes in the scrape-off layer plasma of Alcator C-Mod. The measured N-parallel to of the RF magnetic field component parallel to the background magnetic field is about -1.6, which corresponds to the peak of the launched LH N-parallel to spectrum. Based on the wave dispersion relationship, this wave is identified as the LH slow wave. On the other hand, the RF magnetic field component perpendicular to the magnetic field is found to have a lower N-parallel to of -1.2, and is detected only near the last closed flux surface. This wave is identified as the LH fast wave generated by slow-fast wave mode conversion.

引用

页数：4

共 12 条

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