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research article

Observations on turbulence and beam-ion driven modes in TEXTOR

De Meijere, C. A.
•
Coda, S.
•
Krämer-Flecken, A.
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2012
Plasma Physics and Controlled Fusion

At a sufficiently weak toroidal magnetic field, neutral beam injection heated, limited plasmas in the TEXTOR tokamak exhibit bursts of beam-ion driven 'fishbone' and Alfven modes, which are characterized for the first time using the multi-antenna reflectometer and Mirnov coils. In H-mode the fishbone triggers edge-localized modes (ELMs) and in L-mode it triggers previously unobserved bursts of particle recycling, resembling the ELMs. The reflectometer phase shows statistically significant bispectral coherence between the fishbone and the Alfven modes, indicative of non-linear coupling between them. Additionally, using conditional averaging techniques, two ELM precursor modes are found that are not related to the beam ions. The first is a coherent mode with toroidal mode number n = -2, which is also seen with the Mirnov coils. Bispectral analysis of the reflectometer signals shows that this mode modulates the amplitude of broadband turbulence in the pedestal. The second ELM precursor is a semi-coherent, down-chirping mode with a poloidal wavelength of 6 cm.

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Type
research article
DOI
10.1088/0741-3335/54/10/105024
Web of Science ID

WOS:000309051700025

Author(s)
De Meijere, C. A.
Coda, S.
Krämer-Flecken, A.
Soldatov, S.
Albergante, M.
Corporate authors
TEXTOR Team
Date Issued

2012

Publisher

Iop Publishing Ltd

Published in
Plasma Physics and Controlled Fusion
Volume

54

Issue

10

Article Number

105024

URL

URL

https://crpplocal.epfl.ch/pinboard/jpapers/1105905.pdf
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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Available on Infoscience
February 27, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/89453
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