Fishbone Instability Excited by Electrons in a Tokamak

Longwen, Yan; Dong, J. Q.; Ding, X.T.; Liu, Yi; Gancheng, Guo; Enyao, Wang; Team, Hl M

doi:10.1088/0256-307x/18/9/323

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…We discuss here the excitation of the low frequency global mode by suprathermal electrons that have a DF significantly deviating from the Maxwellian. New low frequency modes were observed in DIII-D [382] and other tokamaks: Frascatti Tokamak Upgrade (FTU [383]), HL-1M [384], HL-2A [385] and Tore Supra [386]. The fast electrons are created during ECR or lower hybrid (LH) heating.…”

Section: Low Frequency Modes Driven By Suprathermalmentioning

confidence: 99%

“…These observations motivated theoretical studies that seem to be interesting to highlight as they show all three elements of the research process identified in the introduction to section 4, namely eigenmodes, drive and the resonant particles. Theories that were published on the electron fishbones include [384,[387][388][389][390] and we would like to recommend the recent thesis on this subject [391]. An important point that follows from theory is that suprathermal electrons can destabilize these instabilities since the excitation depends on the precessional drift and/or the circulating frequency of the charged particle, not on its mass.…”

Section: Low Frequency Modes Driven By Suprathermalmentioning

confidence: 99%

“…An initial theory development [384] allowed the identification of particles that resonate with fishbones in a more quantitative way than in the original experimental paper discussion [382]. Reference [387] pointed out the drive that is coming from the barely trapped electrons.…”

Section: Low Frequency Modes Driven By Suprathermalmentioning

confidence: 99%

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Energetic particle physics in fusion research in preparation for burning plasma experiments

2014

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The area of energetic particle (EP) physics in fusion research has been actively and extensively researched in recent decades. The progress achieved in advancing and understanding EP physics has been substantial since the last comprehensive review on this topic by Heidbrink and Sadler (1994 Nucl. Fusion 34 535). That review coincided with the start of deuterium-tritium (DT) experiments on the Tokamak Fusion Test Reactor (TFTR) and full scale fusion alphas physics studies. Fusion research in recent years has been influenced by EP physics in many ways including the limitations imposed by the 'sea' of Alfvén eigenmodes (AEs), in particular by the toroidicity-induced AE (TAE) modes and reversed shear AEs (RSAEs). In the present paper we attempt a broad review of the progress that has been made in EP physics in tokamaks and spherical tori since the first DT experiments on TFTR and JET (Joint European Torus), including stellarator/helical devices. Introductory discussions on the basic ingredients of EP physics, i.e., particle orbits in STs, fundamental diagnostic techniques of EPs and instabilities, wave particle resonances and others, are given to help understanding of the advanced topics of EP physics. At the end we cover important and interesting physics issues related to the burning plasma experiments such as ITER (International Thermonuclear Experimental Reactor).

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Section: Low Frequency Modes Driven By Suprathermalmentioning

confidence: 99%

Section: Low Frequency Modes Driven By Suprathermalmentioning

confidence: 99%

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Energetic particle physics in fusion research in preparation for burning plasma experiments

2014

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“…The mechanism for electron fishbone is similar, except that the ideal mode is destabilized by barely trapped electrons. Up to now, electron fishbone modes have only been observed associated with the internal (q = 1) kink mode, in discharges heated at the electron cyclotron frequency [21][22][23][24], or with LH waves [25]. But it is natural that, in reversed q-profile plasmas with a suprathermal electron population, an electron fishbone can exist in association with the double-kink mode.…”

Section: Fishbone-like Modementioning

confidence: 99%

“…In order to assess the identification of this mode with an electron fishbone, one would have to prove that it is excited resonantly by barely trapped electrons. This has been done in ECRH experiments for the destabilization of the internal kink mode by fast electrons [21][22][23]. Then, one can compare high-field side heating, which directly drives barely trapped electrons to higher energy, to low-field side heating, which heats deeply trapped electrons.…”

Section: Fishbone-like Modementioning

confidence: 99%

Temperature oscillating regimes in Tore Supra diagnosed by MHD activity

et al. 2006

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This paper describes what we can learn on the regimes of spontaneous electron temperature oscillations discovered in Tore Supra from the analysis of MHD activity. Since the first observations of this oscillating behaviour of plasma equilibrium, and its interpretation as a predator-prey system involving lower hybrid waves power deposition and electron confinement, analysis of MHD modes has confirmed the reality of safety factor profile oscillations. This points towards the importance of rational values of the safety factor in the transition to transport barriers in reversed magnetic shear plasmas.

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Study of energetic particle physics with advanced ECEI system on the HL-2A tokamak

Shi

Jiang

et al. 2017

EPJ Web Conf.

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Abstract. Understanding the physics of energetic particles (EP) is crucial for the burning plasmas in next generation fusion devices such as ITER. In this work, three types of internal kink modes (a saturated internal kink mode (SK), a resonant internal kink mode (RK), and a double e-fishbone) excited by energetic particles in the low density discharges during ECRH/ECCD heating have been studied by the newly developed 24(poloidal) × 16(radial) = 384 channel ECEI system on the HL-2A tokamak. The SK and RK rotate in the electron diamagnetic direction poloidally and are destabilized by the energetic trapped electrons. The SK is destabilized in the case of qmin > 1, while the RK is destabilized in the case of qmin < 1.The double e-fishbone, which has two m/n = 1/1 modes propagating in the opposite directions poloidally, has been observed during plasma current ramp-up with counter-ECCD. Strong thermal transfer and mode coupling between the two m/n = 1/1 modes have been studied.

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Fishbone Instability Excited by Electrons in a Tokamak

Cited by 14 publications

References 5 publications

Energetic particle physics in fusion research in preparation for burning plasma experiments

Energetic particle physics in fusion research in preparation for burning plasma experiments

Temperature oscillating regimes in Tore Supra diagnosed by MHD activity

Study of energetic particle physics with advanced ECEI system on the HL-2A tokamak

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