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A current-driven el...
A current-driven electromagnetic mode in sheared and toroidal configurations
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- Pusztai, Istvan, 1983 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Catto, P. J. (författare)
- Massachusetts Institute of Technology (MIT)
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- Parra, F. I. (författare)
- University Of Oxford,Massachusetts Institute of Technology (MIT)
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- Barnes, M. (författare)
- The University of Texas at Austin, USA,Massachusetts Institute of Technology (MIT)
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(creator_code:org_t)
- 2014-02-11
- 2014
- Engelska.
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Ingår i: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 1361-6587 .- 0741-3335. ; 56:3
- Relaterad länk:
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http://arxiv.org/pdf...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The induced electric field in a tokamak drives a parallel electron current flow. In an inhomogeneous, finite beta plasma, when this electron flow is comparable to the ion thermal speed, the Alfven mode wave solutions of the electromagnetic gyrokinetic equation can become nearly purely growing kink modes. Using the new 'low-flow' version of the gyrokinetic code GS2 developed for momentum transport studies (Barnes et al 2013 Phys. Rev. Lett. 111 055005), we are able to model the effect of the induced parallel electric field on the electron distribution to study the destabilizing influence of current on stability. We identify high mode number kink modes in GS2 simulations and make comparisons to analytical theory in sheared magnetic geometry. We demonstrate reassuring agreement with analytical results both in terms of parametric dependences of mode frequencies and growth rates, and regarding the radial mode structure.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- gyrokinetic
- kink mode
- simulation
- instability
- current gradient
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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