Alfven eigenmodes in the RFX-mod reversed-field pinch plasma

被引：11

作者：

Spagnolo, S. ^{[1
,2
]}

Zuin, M. ^{[1
]}

Auriemma, F. ^{[1
]}

Cavazzana, R. ^{[1
]}

Martines, E. ^{[1
]}

Spolaore, M. ^{[1
]}

Vianello, N. ^{[1
]}

机构：

[1] Assoc EURATOM ENEA Fus, Consorzio RFX, I-35127 Padua, Italy

[2] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy

来源：

NUCLEAR FUSION | 2011年 / 51卷 / 08期

关键词：

SPHERICAL TOKAMAK EXPERIMENT; FREQUENCY MODES; WAVE; EXCITATION; SPECTRUM; INSTABILITIES; TFTR;

D O I：

10.1088/0029-5515/51/8/083038

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：

High-frequency magnetic activity has been detected at the edge region of the RFX-mod reversed-field pinch (RFP) device. The analysis, performed by means of an insertable probe measuring the magnetic field fluctuations, shows coherent modes clearly depending on the Alfven velocity, at a frequency in the range 0.1-1.5 MHz. Two main distinct modes are observed, characterized by low (vertical bar n vertical bar <= 1) toroidal periodicity, with the features of discrete Alfven eigenmodes. A splitting of the mode frequency is detected, a sign of the relevance of non-linearity in the physical process under study. The experimental observations could suggest an interpretation of the modes in terms of global Alfven eigenmodes. Some hints about the possible drive mechanisms are also given.

引用

页数：8

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