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Off-axis Fishbone-l...
Off-axis Fishbone-like Instability and Excitation of Resistive Wall Mode in JT-60U and DIII-D
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Okabayashi, M. (författare)
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Matsunaga, G. (författare)
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Takechi, M. (författare)
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visa fler...
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deGrassie, J.S. (författare)
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Heidbrink, W.W. (författare)
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In, Y. (författare)
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- Liu, Yueqiang, 1971 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Strait, E.J. (författare)
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Asakiura, N. (författare)
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Budny, R. (författare)
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G, Jackson (författare)
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Hanson, J. (författare)
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Haye, R.J. La (författare)
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Lanctot, M.J. (författare)
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J.Manickam, (författare)
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Reimerdes, H. (författare)
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Shinohara, K. (författare)
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(creator_code:org_t)
- 2011
- 2011
- Engelska.
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Ingår i: Physics of Plasmas. - 1089-7674 .- 1070-664X. ; 18, s. 056121-
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Abstract
Ämnesord
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- An energetic-particle (EP)-driven “off-axis-fishbone-like mode (OFM)” often triggers a resistive wall mode (RWM) in JT-60U and DIII-D devices, preventing long-duration high-βN discharges. In these experiments, the EPs are energetic ions (70–85 keV) injected by neutral beams to produce high-pressure plasmas. EP-driven bursting events reduce the EP density and the plasma rotation simultaneously. These changes are significant in high-βN low-rotation plasmas, where the RWM stability is predicted to be strongly influenced by the EP precession drift resonance and by the plasma rotation near the q = 2 surface (kinetic effects). Analysis of these effects on stability with a self-consistent perturbation to the mode structure using the MARS-K code showed that the impact of EP losses and rotation drop is sufficient to destabilize the RWM in low-rotation plasmas, when the plasma rotation normalized by Alfvén frequency is only a few tenths of a percent near the q = 2 surface. The OFM characteristics are very similar in JT-60U and DIII-D, including nonlinear mode evolution. The modes grow initially like a classical fishbone, and then the mode structure becomes strongly distorted. The dynamic response of the OFM to an applied n = 1 external field indicates that the mode retains its external kink character. These comparative studies suggest that an energetic particle-driven “off-axis-fishbone-like mode” is a new EP-driven branch of the external kink mode in wall-stabilized plasmas, analogous to the relationship of the classical fishbone branch to the internal kink mode.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
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Till lärosätets databas
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Okabayashi, M.
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Matsunaga, G.
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Takechi, M.
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deGrassie, J.S.
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Heidbrink, W.W.
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In, Y.
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visa fler...
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Liu, Yueqiang, 1 ...
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Strait, E.J.
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Asakiura, N.
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Budny, R.
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G, Jackson
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Hanson, J.
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Haye, R.J. La
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Lanctot, M.J.
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J.Manickam,
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Reimerdes, H.
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Shinohara, K.
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visa färre...
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Chalmers tekniska högskola