Parallel ion compressibility effects on kinetic ballooning mode for different magnetic shears

Li, Y.; Xiao, Yong

doi:10.1063/1.4997489

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Low-n shear Alfvén and ion sound wave spectra occur to couple strongly when the beta effect is large, and the diamagnetic effects are very complex when included self-consistently along with resonant waveparticle interactions in a realistic magnetic geometry [14]. The stability of AITG modes has a strong and complex dependence on the values of s and α as well as various effects, including trapped electrons, finite B , the plasma shape, Shafranov shift and parallel ion current [8,13,[32][33][34][35]. The interaction between AITG activity and EPs should also be investigated with greater attention in fusion plasmas, such as ITER, since weak magnetic shear amplifies the role and possible excitation of these fluctuations by EPs, as predicted by the GFLDR-E.…”

Section: Discussionmentioning

confidence: 99%

Kinetic electromagnetic instabilities in an ITB plasma with weak magnetic shear

Chen¹,

Yu²,

Ma³

et al. 2018

Nucl. Fusion

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Kinetic Alfvén and pressure gradient driven instabilities are very common in magnetized plasmas, both in space and the laboratory. These instabilities will be easily excited by energetic particles (EPs) and/or pressure gradients in present-day fusion and future burning plasmas. This will not only cause the loss and redistribution of the EPs, but also affect plasma confinement and transport. Alfvénic ion temperature gradient (AITG) instabilities with the frequency ω BAE < ω < ω TAE and the toroidal mode numbers n = 2−8 are found to be unstable in NBI internal transport barrier plasmas with weak shear and low pressure gradients, where ω BAE and ω TAE are the frequencies of the beta-and toroidicity-induced Alfvén eigenmodes, respectively. The measured results are consistent with the general fishbone-like dispersion relation and kinetic ballooning mode equation, and the modes become more unstable the smaller the magnetic shear is in low pressure gradient regions. The interaction between AITG activity and EPs also needs to be investigated with greater attention in fusion plasmas, such as ITER (Tomabechi and The ITER Team 1991 Nucl. Fusion 31 1135), since these fluctuations can be enhanced by weak magnetic shear and EPs.

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Section: Discussionmentioning

confidence: 99%

Kinetic electromagnetic instabilities in an ITB plasma with weak magnetic shear

Chen¹,

Yu²,

Ma³

et al. 2018

Nucl. Fusion

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“…The time step size for ITG simulation is ∆t = 0.01R 0 /C s , and ∆t = 0.005R 0 /C s for KBM cases. In addition, the homogeneous Dirichlet boundary effect is negligible due to the width of each individual harmonic of the turbulence much smaller than the radial simulation width (Li and Xiao 2017).…”

Section: Simulation Parametersmentioning

confidence: 99%

The performance of equilibrium radial electric field shear on microturbulence with different magnetic shears in tokamak plasmas

Chen

Qin

Sun

et al. 2023

Plasma Phys. Control. Fusion

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Global gyrokinetic particle simulations show that equilibrium radial electric field (Er) shear reduces the linear growth rate, ion heat conductivity, and nonlinear turbulence amplitude for both the ion temperature gradient (ITG) and kinetic ballooning mode (KBM) microturbulence with tilting the poloidal mode structure. Increase in the magnetic shear enhances the stabilizing performance of the Er shear on linear growth rate for ITG case but has no effect on that for KBM case. The radial correlation length of the ITG turbulence is decreased by increasing the magnetic shear in a weak ion diamagnetic flow shear condition with low β, leading to a reduction in effective ExB shearing rate, which weakens the suppression performance of the Er shear on ITG turbulence amplitude. In contrast, under a larger ion diamagnetic flow shear for higher β, increase in magnetic shear strengthens the suppression performance of the Er shear on KBM turbulence amplitude due to increase in the effective shearing rate by increasing the radial correlation length of the turbulence.

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Preface to Special Issue Containing Invited Papers Presented at Gyrokinetic Particle Simulation: A Symposium in Honor of Wei-li Lee (University of California, Irvine, July 18–22, 2016)

Zhang

2017

Physics of Plasmas

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Parallel ion compressibility effects on kinetic ballooning mode for different magnetic shears

Cited by 5 publications

References 24 publications

Kinetic electromagnetic instabilities in an ITB plasma with weak magnetic shear

Kinetic electromagnetic instabilities in an ITB plasma with weak magnetic shear

The performance of equilibrium radial electric field shear on microturbulence with different magnetic shears in tokamak plasmas

Preface to Special Issue Containing Invited Papers Presented at Gyrokinetic Particle Simulation: A Symposium in Honor of Wei-li Lee (University of California, Irvine, July 18–22, 2016)

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