We investigate the effects of runaway electron current on the dispersion relation of resistive magnetohydrodynamic modes in tokamaks. We present a new theoretical model to derive the dispersion relation, which is based on the asymptotic analysis of the resistive layer structure of the modes. It is found that in addition to the conventional resistive layer, a new runaway current layer can emerge whose properties depend on the ratio of the Alfvén velocity to the runaway electron convection speed. Due to the contribution from this layer, both the tearing mode and kink mode will have a real frequency in addition to a growth rate. The derived dispersion relation has been compared with numerical results using both a simplified eigenvalue calculation and a M3D-C1 linear simulation, and good agreement is found in both cases.
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September 2020
Research Article|
September 09 2020
Structure and overstability of resistive modes with runaway electrons
Chang Liu
;
Chang Liu
a)
1
Plasma Physics Laboratory
, Princeton, New Jersey 08540, USA
a)Author to whom correspondence should be addressed: [email protected]
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Chen Zhao
;
Chen Zhao
1
Plasma Physics Laboratory
, Princeton, New Jersey 08540, USA
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Stephen C. Jardin
;
Stephen C. Jardin
1
Plasma Physics Laboratory
, Princeton, New Jersey 08540, USA
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Amitava Bhattacharjee
;
Amitava Bhattacharjee
1
Plasma Physics Laboratory
, Princeton, New Jersey 08540, USA
2
Princeton University
, Princeton, New Jersey 08544, USA
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Dylan P. Brennan
;
Dylan P. Brennan
2
Princeton University
, Princeton, New Jersey 08544, USA
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Nathanial M. Ferraro
Nathanial M. Ferraro
1
Plasma Physics Laboratory
, Princeton, New Jersey 08540, USA
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Chang Liu
1,a)
Chen Zhao
1
Stephen C. Jardin
1
Amitava Bhattacharjee
1,2
Dylan P. Brennan
2
Nathanial M. Ferraro
1
1
Plasma Physics Laboratory
, Princeton, New Jersey 08540, USA
2
Princeton University
, Princeton, New Jersey 08544, USA
a)Author to whom correspondence should be addressed: [email protected]
Phys. Plasmas 27, 092507 (2020)
Article history
Received:
June 16 2020
Accepted:
August 08 2020
Citation
Chang Liu, Chen Zhao, Stephen C. Jardin, Amitava Bhattacharjee, Dylan P. Brennan, Nathanial M. Ferraro; Structure and overstability of resistive modes with runaway electrons. Phys. Plasmas 1 September 2020; 27 (9): 092507. https://doi.org/10.1063/5.0018559
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