Nonlinear fishbone dynamics in spherical tokamaks

Wang, Feng; Fu, G. Y.; Shen, Wei

doi:10.1088/0029-5515/57/1/016034

Nonlinear fishbone dynamics in spherical tokamaks

Journal Article · Tue Nov 22 00:00:00 EST 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/57/1/016034· OSTI ID:1338615

Wang, Feng ^[1]; Fu, G. Y. ^[2]; Shen, Wei ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Dalian Univ. of Technology (People's Republic of China). School of Physics and Optoelectronic Technology
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Zhejiang Univ., Hangzhou (China). Inst. for Fusion Theory and Simulation and Dept. of Physics
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Plasma Physics

Linear and nonlinear kinetic-MHD hybrid simulations have been carried out to investigate linear stability and nonlinear dynamics of beam-driven fishbone instability in spherical tokamak plasmas. Realistic NSTX parameters with finite toroidal rotation were used. Our results show that the fishbone is driven by both trapped and passing particles. The instability drive of passing particles is comparable to that of trapped particles in the linear regime. The effects of rotation are destabilizing and a new region of instability appears at higher q _min (>1.5) values, q _min being the minimum of safety factor profile. In the nonlinear regime, the mode saturates due to flattening of beam ion distribution, and this persists after initial saturation while mode frequency chirps down in such a way that the resonant trapped particles move out radially and keep in resonance with the mode. Correspondingly, the flattening region of beam ion distribution expands radially outward. Furthermore, a substantial fraction of initially non-resonant trapped particles become resonant around the time of mode saturation and keep in resonance with the mode as frequency chirps down. On the other hand, the fraction of resonant passing particles is significantly smaller than that of trapped particles. Finally, our analysis shows that trapped particles provide the main drive to the mode in the nonlinear regime.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1338615

Alternate ID(s):: OSTI ID: 1333233
OSTI ID: 22925579

Report Number(s):: 5320

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Nonlinear fishbone dynamics in spherical tokamaks [Supplementary Data] Wang, Feng; Fu, G.Y.; Shen, Wei DataSpacePrinceton-Supplementary information for journal article at DOI: 10.1088/0029-5515/57/1/016034, 2 files https://doi.org/10.11578/1367618		January 2017
Hybrid simulations of fishbone instabilities and Alfvén eigenmodes in DIII-D tokamak Ren, Zhen-Zhen; Fu, G. Y.; Van Zeeland, M. A. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5064647	journal	December 2018
Nonlinear fishbone dynamics in spherical tokamaks Wang, F.; Fu, G.; Shen, W. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1562016	dataset	January 2017

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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frequency chirping
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