Kinetic calculation of the resistive wall mode and fishbone-like mode instability in tokamak

Hao, G. Z.; Yang, Shengcai; Liu, Y. Q.; Wang, Z. X.; Wang, A. K.; He, Huimin

doi:10.1063/1.4953100

Cited by 10 publications

(6 citation statements)

References 30 publications

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“…On the other hand, the presence of high energy alpha particles slightly weakens the stabilizing effect of thermal particles, indicating a cancellation effect of the precessional drift resonances between thermal and energetic particles. We mention that similar cancellation effect has previously be found, albeit for the external kink mode (the resistive wall mode) [38,39]. Finally, we note that drift kinetic resonances also produce finite mode frequency (in the absence of the plasma equilibrium flow), as shown by the horizontal axis in Fig.…”

Section: Internal Kink Stability and Sawtooth Crash For Reference Plasmasupporting

confidence: 84%

Drift kinetic effects and local current drive induced modification of magnetic shear on sawtooth activity in EU DEMO

Zhou¹,

Liu²,

Siccinio³

et al. 2020

Nucl. Fusion

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The sawtooth activity is investigated for an EU DEMO reference plasma, including kinetic effects from both thermal particles and fusion-born alphas. Kinetic effects are studied in conjunction with modification of the magnetic shear near the q=1 surface (q is the safety factor) due to local current drive. Kinetic stabilization on the internal kink mode is found by both the non-perturbative MHDkinetic hybrid code MARS-K [Liu et al., Phys. Plasmas 15, 112503 (2008)] and the perturbative semi-analytic Porcelli model. The latter predicts full stabilization of the mode, when the local magnetic shear s1 at the q=1 surface is less than 1 (e.g. s1~0.6 as is the case for the target EU DEMO plasma without local current drive). By increasing the local magnetic shear with local current drive up to s1~2.8, one of the Porcelli sawtooth crash criteria can be satisfied, by accessing the ion-kinetic regime. Direct MARS-K non-perturbative eigenvalue computations, on the other hand, predict less kinetic stabilization of the internal kink and more robust triggering of the sawtooth crash in EU DEMO. The general trend of the predicted results remains similar though, between the MARS-K model and the Porcelli model.

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Section: Internal Kink Stability and Sawtooth Crash For Reference Plasmasupporting

confidence: 84%

Drift kinetic effects and local current drive induced modification of magnetic shear on sawtooth activity in EU DEMO

Zhou¹,

Liu²,

Siccinio³

et al. 2020

Nucl. Fusion

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“…Thermal particle collisions can either stabilize or destabilize RWM, depending on the energetic particle pressure. When the thermal particle precessional drift resonance contribution is taken into account, the critical value of energetic particle pressure for the FLM is shown to increase [71]. He found a similar effect on the critical value in toroidal computations.…”

Section: Energetic Particle Transportmentioning

confidence: 74%

Summary of the 6th asia-pacific transport working group (APTWG) meeting

et al. 2017

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This report summarizes the contributions to, and discussions at, the 6th Asia-Pacific Transport Working Group (APTWG) meeting, held on 21-25 June 2016 at Korea University, Seoul, Republic of Korea. The objective of the meeting was to develop an integrated understanding of transport phenomena in magnetically confined plasmas. To accomplish this objective, four technical working groups were organized under the headings: (1) turbulence suppression and transport bifurcation, (2) effect of magnetic topology on transport and magnetohydrodynamicsturbulence interaction, (3) nonlocality and non-diffusive transport, and (4) Energetic particles and particle/impurity transport. A summary is also given of the three plenary review talks on impurity transport, the magnetohydrodynamics relaxation process in reversed field pinch, and recent experimental and modelling results on the quiescent H-mode operation.

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“…The ECRH is prone to meeting the first two conditions due to decreasing ω * i and increasing S M . Indeed, the damping provided by the transit resonance of circulating thermal ions may become strong with reducing Ti and collisionality, and thus the mode is more stable [33,34].…”

mentioning

confidence: 99%

Stabilization of ion fishbone activities by electron cyclotron resonance heating in a toroidal plasma

Chen

Shi

et al. 2017

Nucl. Fusion

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We report an experimental result on the stabilization of the energetic–ion driven internal kink mode (ion fishbone) by electron cyclotron resonance heating (ECRH), observed for the first time in a toroidal plasma. The mode asserts itself a resistive branch close to the marginal stability point. The resulting fishbone mode depends not only on the injected power but also on the radial deposition location of ECRH, and the instability can be completely suppressed when the injected ECRH power exceeds certain threshold. Analysis by the fishbone dispersion relation, including the resistive effect, suggests that the magnetic Reynolds number plays a key role in the mode stabilization—it weakens the mode growth-rate and enhances the critical energetic–ion beta without changing the energetic–ion population. This ion fishbone stabilization mechanism can be important for future devices such as ITER, which has significant ECRH capability.

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Kinetic calculation of the resistive wall mode and fishbone-like mode instability in tokamak

Cited by 10 publications

References 30 publications

Drift kinetic effects and local current drive induced modification of magnetic shear on sawtooth activity in EU DEMO

Drift kinetic effects and local current drive induced modification of magnetic shear on sawtooth activity in EU DEMO

Summary of the 6th asia-pacific transport working group (APTWG) meeting

Stabilization of ion fishbone activities by electron cyclotron resonance heating in a toroidal plasma

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