Acoustic mode driven by fast electrons in TJ-II Electron Cyclotron Resonance plasmas

Intense harmonic oscillations in radiation signals are commonly observed during Electron Cyclotron Resonance (ECR) heating in TJ-II stellarator plasmas at low line-averaged electron density, . The frequency agrees with acoustic modes. The poloidal modal structure is compatible with Geodesic Acoustic...

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Bibliographic Details
Published inEurophysics letters Vol. 115; no. 3; p. 35001
Main Authors Sun, B. J., Ochando, M. A., López-Bruna, D.
Format Journal Article
LanguageEnglish
Published Les Ulis EDP Sciences, IOP Publishing and Società Italiana di Fisica 01.08.2016
IOP Publishing
Subjects
52.35.Fp
52.35.Py
52.55.Hc
Acoustic resonance
Compatibility
Cyclotron resonance
Electron cyclotron resonance
Electron density
Geodesy
Harmonic oscillation
Heating
Plasmas
Plasmas (physics)
Stellarators
Transforms
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Summary:Intense harmonic oscillations in radiation signals are commonly observed during Electron Cyclotron Resonance (ECR) heating in TJ-II stellarator plasmas at low line-averaged electron density, . The frequency agrees with acoustic modes. The poloidal modal structure is compatible with Geodesic Acoustic Modes (GAM) but an toroidal structure is detected. The modes are found in the proximity of low-order rationals of the rotational transform ( in this work) and are excited by fast-electron populations, but they disappear at the onset of -islands rotation.
Bibliography:ark:/67375/80W-W358FB0Q-P
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publisher-ID:epl18046
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/115/35001