Experimental studies of plasma-antenna coupling with the JET Alfven Eigenmode Active Diagnostic

被引：7

作者：

Tinguely, R. A. ^{[1
]}

Puglia, P. G. ^{[2
]}

Fil, N. ^{[3
]}

Dowson, S. ^{[3
]}

Porkolab, M. ^{[1
]}

Dvornova, A. ^{[4
]}

Fasoli, A. ^{[2
]}

Fitzgerald, M. ^{[3
]}

Guillemot, V ^{[5
]}

Huysmans, G. T. A. ^{[4
]}

Maslov, M. ^{[3
]}

Sharapov, S. ^{[3
]}

Testa, D. ^{[2
]}

机构：

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

[2] Ecole Polytech Fed Lausanne, Swiss Plasma Ctr, CH-1015 Lausanne, Switzerland

[3] Culham Sci Ctr, Culham Ctr Fus Energy, Abingdon, Oxon, England

[4] CEA, IRFM, F-13108 St Paul Les Durance, France

[5] Ecole Super Phys & Chim Ind Ville Paris, F-75231 Paris 05, France

来源：

NUCLEAR FUSION | 2021年 / 61卷 / 02期

基金：

巴西圣保罗研究基金会; 英国工程与自然科学研究理事会;

关键词：

Alfvé n eigenmodes; stability; plasma-antenna coupling; magnetic configuration;

D O I：

10.1088/1741-4326/abc7eb

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：

This paper presents a dedicated study of plasma-antenna (PA) coupling with the Alfven Eigenmode Active Diagnostic (AEAD) in JET. Stable AEs and their resonant frequencies f, damping rates gamma < 0, and toroidal mode numbers n are measured for various PA separations and limiter versus X-point magnetic configurations. Two stable AEs are observed to be resonantly excited at distinct low and high frequencies in limiter plasmas. The values of f and n do not vary with PA separation. However, |gamma| increases with PA separation for the low-f, but not high-f, mode, yet this may be due to slightly different edge conditions. The high-f AE is detected throughout the transition from limiter to X-point configuration, though its damping rate increases; the low-f mode, on the other hand, becomes unidentifiable. The linear, resistive MHD code CASTOR is used to simulate the frequency scan of an AEAD-like external antenna. For the limiter pulses, the high-f mode is determined to be an n = 0 GAE, while the low-f mode is likely an n = 2 TAE. During the transition from limiter to X-point configuration, CASTOR indicates that n = 1 and 2 EAEs are excited in the edge gap. These results extend previous experimental studies in JET and Alcator C-Mod; validate the computational work performed by Dvornova et al (2020 Phys. Plasmas 27 012507); and provide guidance for the optimization of PA coupling in upcoming JET energetic particle experiments, for which the AEAD will aim to identify the contribution of alpha particles to AE drive during the DT campaign.

引用

页数：14

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