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pro vyhledávání: '"Brennan, Dylan"'
Autor:
Liu, Chang, Jardin, Stephen C., Bao, Jian, Gorelenkov, Nikolai, Brennan, Dylan P., Yang, James, Podesta, Mario
The kinetic-MHD hybrid simulation approach for macroscopic instabilities in plasmas can be extended to include the kinetic effects of both thermal ions and energetic ions. The new coupling scheme includes synchronization of density and parallel veloc
Externí odkaz:
http://arxiv.org/abs/2206.03648
Autor:
Liu, Chang, Brennan, Dylan P., Lvovskiy, Andrey, Paz-Soldan, Carlos, Fredrickson, Eric D., Bhattacharjee, Amitava
Compressional Alfv\'en eigenmodes (CAE) driven by energetic ions have been observed in magnetic fusion experiments. In this paper, we show that the modes can also be driven by runaway electrons formed in post-disruption plasma, which may explain kine
Externí odkaz:
http://arxiv.org/abs/2009.11801
Autor:
Liu, Chang, Zhao, Chen, Jardin, Stephen C., Bhattacharjee, Amitava, Brennan, Dylan P., Ferraro, Nathanial M.
Publikováno v:
Physics of Plasmas 27, 092507 (2020)
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 t
Externí odkaz:
http://arxiv.org/abs/2006.08463
We present nonlinear resistive MHD simulations of the response of a rotating plasma to an error field when the plasma has weakly damped linear tearing modes (TM's), stabilized by pressure gradient and favorable curvature. Favorable curvature leads to
Externí odkaz:
http://arxiv.org/abs/2001.01831
Autor:
Liu, Chang, Shi, Lei, Hirvijoki, Eero, Brennan, Dylan P., Bhattacharjee, Amitava, Paz-Soldan, Carlos, Austin, Max E.
In this paper we show that the kinetic instabilities associated with runaway electron beams play an essential role for the production of high-level non-thermal electron-cyclotron-emission (ECE) radiation. Most of the non-thermal ECE comes from runawa
Externí odkaz:
http://arxiv.org/abs/1803.09897
The problem of self-consistently coupling kinetic runaway-electron physics to the macroscopic evolution of the plasma is addressed by dividing the electron population into a bulk and a tail. A probabilistic closure is adopted to determine the couplin
Externí odkaz:
http://arxiv.org/abs/1802.02174
Autor:
Liu, Chang, Hirvijoki, Eero, Fu, Guo-yong, Brennan, Dylan P., Bhattacharjee, Amitava, Paz-Soldan, Carlos
Publikováno v:
Phys. Rev. Lett. 120, 265001 (2018)
The effects of kinetic whistler-wave instabilities on the runaway-electron (RE) avalanche is investigated. With parameters from DIII-D experiments, we show that RE scattering from excited whistler waves can explain several poorly understood experimen
Externí odkaz:
http://arxiv.org/abs/1801.01827
Tearing modes with real frequencies in the plasma frame (i.e. in addition to the Doppler shift due to $E\times B$ rotation) are of potential importance because of their effect on the locking process. In particular, it has recently been shown [J. M. F
Externí odkaz:
http://arxiv.org/abs/1708.04700
The effects that energetic trapped ions have on linear resistive magnetohydrodynamic (MHD) instabilities are studied in a reduced model that captures the essential physics driving or damping the modes through variations in the magnetic shear. The dri
Externí odkaz:
http://arxiv.org/abs/1702.06837
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