Influence of Energetic Ions on Tearing Modes

Cai, Huishan; Wang, Shaojie; Xu, Yingfeng; Cao, Jintao; Li, Ding

doi:10.1103/physrevlett.106.075002

Cited by 65 publications

(103 citation statements)

References 18 publications

(42 reference statements)

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“…17) to investigate numerically the interaction between energetic particles and tearing modes. Our simulation results confirmed the analytic results of Cai et al 16 in the limit of small energetic particle beta. New results of circulating energetic particle effects on tearing modes at higher beta as well as trapped energetic particle effects will be shown.…”

Section: Introductionsupporting

confidence: 94%

“…16, where it was shown that the effects of energetic ions on tearing modes mainly come from the ideal region of tearing modes due to large drift orbit width of energetic ions. It is known that classical tearing modes are driven by parallel current density gradient with their stability characterized by the parameter D 0 .…”

Section: Physics Picturementioning

confidence: 99%

“…In Ref. 16, the stability criterion of tearing modes including circulating energetic ions effects in the limit of large q h and low b h is derived as…”

Section: Physics Picturementioning

confidence: 99%

“…Recently, energetic particle loss due to neoclassical tearing modes (NTMs) and energetic particle stabilization of NTMs have been observed in tokamak experiments. [11][12][13] Several theories and simulation 5,[14][15][16] have also shown that energetic particles can interact with tearing modes significantly. In the simulation by Takahashi et al, 15 it has been found that energetic particles have a stabilizing effect on tearing modes similar to their effects on internal kink mode.…”

Section: Introductionmentioning

confidence: 96%

“…In Ref. 16, it was shown analytically that the diamagnetic current generated by the magnetic drift of circulating energetic ions can change the parallel current and affect the stability of tearing modes. In this article, we will employ the global kinetic/MHD hybrid code M3D-K (Ref.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid simulation of energetic particle effects on tearing modes in tokamak plasmas

Cai

2012

Physics of Plasmas

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The effects of energetic ions on stability of tearing mode are investigated by global kinetic/MHD hybrid simulations in a low beta tokamak plasma. The kinetic effects of counter circulating energetic ions from the non-adiabatic response are found to be strongly destabilizing while the effects from the adiabatic response are stabilizing. The net effect with both adiabatic and nonadiabatic contributions is destabilizing. On the other hand, the kinetic effects of co-circulating energetic ions from the non-adiabatic response are calculated to be weakly stabilizing while the corresponding adiabatic contribution is destabilizing for small energetic ion beta. The net effect is weakly stabilizing. The dependence of kinetic effects on energetic ion beta, gyroradius, and speed is studied systematically and the results agree in large part with the previous analytic results for the kinetic effects of circulating particles. For trapped energetic ions, their effects on tearing mode stability are dominated by the adiabatic response due to large banana orbit width and strong poloidal variation of particle pressure. The net effect of trapped energetic particles on tearing modes is much more destabilizing as compared to that of counter circulating particles at the same beta value. V C 2012 American Institute of Physics. [http://dx.

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Section: Introductionsupporting

confidence: 94%

Section: Physics Picturementioning

confidence: 99%

“…In Ref. 16, the stability criterion of tearing modes including circulating energetic ions effects in the limit of large q h and low b h is derived as…”

Section: Physics Picturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Hybrid simulation of energetic particle effects on tearing modes in tokamak plasmas

Cai

2012

Physics of Plasmas

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Discrete fast‐ion detection with energy discrimination in plasmas having edge‐localized mode‐like instabilities in the stellarator TJ‐II

Martínez

Zurro²,

Baciero³

et al. 2018

Contributions to Plasma Physics

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The existence of a population of ions, with energies well above the corresponding thermal values, in plasmas heated by neutral beam injection (NBI) in the stellarator TJ-II and in other magnetically confined plasmas devices is well known. Moreover, during the NBI phase of the TJ-II, edge-localized mode-like (ELM-like) instabilities often appear. This work studies the relationship between fast ions escaping from TJ-II plasmas and such ELM-like events. For this, an ion luminescent probe (LP), operated with a fast scintillator (decay time = 27 ns) and high-speed conditioning electronics (100 MHz), is used to measure, without pile-up effects, the energy distribution of suprathermal ions across the energy range, from 1 to 30 keV. It is found that the LP detects suprathermal ion populations that can be related to ELM-like events whose temperatures oscillate between 0.5 and 3 keV and that can be distinguished in a spectrogram of the LP response as an increase in frequencies from 15 to 150 kHz. Finally, observations of substructures within ELM-likes events, consisting of bursts of ions, with times between 5 and 15 μs are also reported. Such substructures have been observed previously in both tokamaks and stellarators in ion saturation current, high-speed camera images, etc. However, understanding the fast-ion component can provide new and relevant information about the behaviour of ions.

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Summary of magnetic fusion plasma physics in 1st AAPPS-DPP meeting

Zhong

2018

Rev. Mod. Plasma Phys.

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Influence of Energetic Ions on Tearing Modes

Cited by 65 publications

References 18 publications

Hybrid simulation of energetic particle effects on tearing modes in tokamak plasmas

Hybrid simulation of energetic particle effects on tearing modes in tokamak plasmas

Discrete fast‐ion detection with energy discrimination in plasmas having edge‐localized mode‐like instabilities in the stellarator TJ‐II

Summary of magnetic fusion plasma physics in 1st AAPPS-DPP meeting

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