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Theoretical interpretation of frequency sweeping observations in the Mega-Amp Spherical Tokamak

Vann, R.G.L., Dendy, R.O. and Gryaznevich, M.P. (2005) Theoretical interpretation of frequency sweeping observations in the Mega-Amp Spherical Tokamak. Physics of Plasmas, 12 (3). 032501-1. ISSN 1070-664X

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Abstract

Frequency sweeping (chirping) of high frequency magnetohydrodynamic modes is widely observed in tokamak plasmas. In this paper observations of chirping in neutral-beam-heated plasmas in the Mega-Amp Spherical Tokamak (MAST) [A. Sykes, R. J. Akers, L. C. Appel et al., Nucl. Fusion 41, 1423 (2001)] are considered, and it is shown that these may be interpreted using the Berk–Breizman augmentation of the Vlasov–Maxwell equations. This model includes an energetic particle source: it leads not only to a single chirp but also to a series of bursting events. This repetitious behavior is characteristic of the chirping seen in experiments such as MAST. The similarity between features in velocity space and features in frequency space reinforces the theory that hole-clump pair formation is responsible for the observed frequency sweeping.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 23 Feb 2009 15:36
Last Modified: 23 Feb 2009 15:36
Published Version: http://dx.doi.org/10.1063/1.1851991
Status: Published
Publisher: American Institute of Physics
Identification Number: 10.1063/1.1851991
URI: http://eprints.whiterose.ac.uk/id/eprint/7249

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