Observation of the double e-fishbone instability in HL-2A ECRH/ECCD plasmas

Jiang, M.; Ding, X.T.; Shi, Z.B.; Chen, W.; Yu, Liming; Dong, J. Q.; Xu, Yuan; Liu, Y.; Yuan, B.S.; Zhong, W.L.; Zhou, Yan; Li, Y. G.; Yang, Z.C.; Shi, Peng; Dong, Ye; Qi, Yang; Duan, X.R.; Team, Hl A

doi:10.1063/1.4975667

Cited by 12 publications

(11 citation statements)

References 28 publications

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“…With counter-ECCD injection during the plasma current ramp-up, the double structure of e-fishbones have been observed [26]. The typical discharge with double efishbone instability is shown in Fig.6.…”

Section: Double E-fishbonementioning

confidence: 93%

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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Section: Double E-fishbonementioning

confidence: 93%

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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“…ECEI is an advanced extension of the traditional ECE radiometry with the same basic principle; however, it can image the plasma onto a vertically aligned antenna array by using a set of quasi-optical lenses with the heterodyne frequency capability yielding 2D images. The ECEI diagnostic has been proven to be a powerful tool for MHD physics through electron temperature fluctuation measurements, providing invaluable images on core/edge physics [6][7][8][9][10][11]. The ECEI instrument includes four subsystems, i.e., quasi-optical system, antenna array, microwave receivers and digitizers.…”

Section: Ecei On Hl-2a and The Optical Optimizationmentioning

confidence: 99%

“…In HL-2A, the ECEI diagnostic has been extensively used to detect the 2D structure of large scale MHD modes [10,11,15,16], such as tearing mode, fishbone, and sawtooth crash. Figure 7 shows the mode structure of the m/n=2/1 tearing mode.…”

Section: Multi-scale Interaction Between Tm and Turbulencementioning

confidence: 99%

Development of ECE/ECEI diagnostics and MHD-related studies on HL-2A tokamak

et al. 2019

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A novel 60-channel electron cyclotron emission (ECE) radiometer has been designed and tested for the measurement of electron temperature profiles on the HL-2A tokamak. This system is based on the intermediate frequency division technique, and has the features of wide working frequency range (60−90 GHz) and high temporal-spatial resolution (3 µs, 1 cm), which covers almost the entire plasma region. Also, an electron cyclotron emission imaging (ECEI) system has been developed for studying two dimensional electron temperature fluctuations. It is comprised of several front-end quasi-optical lenses, a 24 channel heterodyne imaging array with a tunable RF frequency range spanning 60−135 GHz, and a set of back-end ECEI electronics that together generate two 24×8 array images of the 2nd harmonic X-mode electron cyclotron emission from the HL-2A plasma. The measurement region can be flexibly shifted due to two independent local oscillator sources, and the field of view can be adjusted easily by changing the position of the zoom lenses as well. The temporal resolution is about 2.5 µs and the achievable spatial resolution is 1 cm. The ECE/ECEI diagnostics have been demonstrated to be powerful tools to study MHD-related physics including the multi-scale interaction between macro-scale MHD and micro-scale turbulence on the HL-2A tokamak.

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“…为了增强聚变装置对等离子体的约束性能, 人们通过控制和优化等离子体电流剖面 [25] . [27] . 同时也发现, 在NBI和LHCD混合方案中, 沿ρ方向上更宽的区域束缚了相对更丰富的αTAE.…”

Section: Hl-2a装置上不同放电方案下的αtaeunclassified

Discrete Alfvén eigenmodes in HL-2A tokamak

He¹,

Hu²,

Wu³

et al. 2019

Sci. Sin.-Phys. Mech. Astron.

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Basing on HL-2A tokamak, applying a magnetohydrodynamic (MHD) simulate codes, we study the characteristics of discrete Alfvén eigenmodes (αTAEs, α is a measure of plasma pressure gradient) in the power deposition region of lower hybrid wave auxiliary heating scheme. We explore the distribution of αTAE upon varied different plasma profiles. Employing gyrokinetic-MHD hybrid simulate codes, we investigate αTAE kinetically excited by energetic particles produced by neutral beam injection. Furthermore, we study physical characteristics of αTAE destabilized by energy particles in the lower hybrid wave power deposition region. In addition, we find that there exist αTAEs in HL-2A tokamak with relatively small α values. Besides, the αTAEs are mainly distributed in the reversal magnetic shear region. There are the abundant αTAEs in the lower hybrid wave power deposition region, where the amount of lower hybrid wave power deposition is greater. Moreover, with different plasma profiles, abundant αTAEs are found in the different region in the directions of the small radius of the HL-2A tokamak. With the increase of the neutral beam injection energy, the multiple branches of αTAEs are developed kinetically into unstable modes, which may potentially affect the plasma confinement of tokamak. tokamak, Alfvén eigenmodes, energetic particles, instabilities

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Observation of the double e-fishbone instability in HL-2A ECRH/ECCD plasmas

Cited by 12 publications

References 28 publications

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

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

Development of ECE/ECEI diagnostics and MHD-related studies on HL-2A tokamak

Discrete Alfvén eigenmodes in HL-2A tokamak

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Observation of the double e-fishbone instability in HL-2A ECRH/ECCD plasmas

Cited by 12 publications

References 28 publications

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

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

Development of ECE/ECEI diagnostics and MHD-related studies on HL-2A tokamak

Discrete Alfv&eacute;n eigenmodes in HL-2A tokamak

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Discrete Alfvén eigenmodes in HL-2A tokamak