Pushforward transformation of gyrokinetic moments under electromagnetic fluctuations

Liu, Pengfei; Zhang, Wenlu; Dong, Chao; Lin, Jingbo; Zhang, Lin; Li, Ding

doi:10.1063/1.4989892

Cited by 6 publications

(4 citation statements)

References 43 publications

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“…We note that this total wave-electron energy exchange rate is consistent with the conventional calculation of the interchange drive. We rewrite equation (B1) with gyrofluid moments [45,60,61] as follows…”

Section: Appendix Amentioning

confidence: 99%

Gyrokinetic simulation of low-frequency Alfvénic modes in DIII-D tokamak

et al. 2021

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Global gyrokinetic simulations find that a beta-induced Alfvén eigenmode (BAE) and a low-frequency mode (LFM) co-exist in the DIII-D tokamak experiments. The simulated LFM mode structure and many of its parametric dependencies are consistent with experimental observations. The LFM can be excited without fast ions and has a frequency inside the gap of the beta-induced Alfvén-acoustic eigenmode (BAAE). However, an antenna scan shows that it is NOT the conventional BAAE. Instead, the LFM is an interchange-like electromagnetic mode excited by non-resonant drive of pressure gradients. Furthermore, the simulated BAE mode structure is consistent with the experiment but the frequency is lower than the experiment. The compressible magnetic perturbations significantly increase the growth rates of the BAE and LFM. On the other hand, trapped electrons and equilibrium current have modest effects on the BAE and LFM.

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Section: Appendix Amentioning

confidence: 99%

Gyrokinetic simulation of low-frequency Alfvénic modes in DIII-D tokamak

et al. 2021

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“…P ζ /ψ w are initialized in the range of (0.15, 0.42). The particle positions in figure 5 Using the nonlinear gyrokinetic equations [31][32][33][34], we can calculate the trajectory of the deeply trapped particles using the perturbed electrostatic potential ϕ = φ(ψ, ϵt)e i α , where ϵ indicates the slow evolution of the mode amplitude and α = nζ − mθ − ωt, α ∈ [0, 2π), with a single toroidal mode number n. Since the parallel wave wavelength is much longer than the distance that a deeply trapped particle travels along the magnetic field line, i.e. k ∥ ≈ 0, the guiding center equation of motion is…”

Section: Intrinsically 2d Particle Dynamicsmentioning

confidence: 99%

A new paradigm for fast and repetitive chirping of Alfvén eigenmodes

Cheng,

Zhang,

Lin

et al. 2023

Nucl. Fusion

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A novel 2D nonlinear dynamical paradigm is constructed to interpret the fast and repetitivefrequency chirping and amplitude oscillation of Alfvén eigenmodes excited by energetic particles infusion plasmas as observed in global gyrokinetic simulations. In this non-perturbative paradigmof the collisionless phase-space dynamics, wave-particle resonant interactions cause the phase-spacestructure to continuously twist and fold, leading to the repetitive excitation and decay of the Alfvéneigenmode. The radial (perpendicular to the dominant wave-particle interaction) dependence of themode amplitude and toroidal precessional drifts of the energetic particles leads to the 2D dynamicsof wave-particle interactions, which is found to be responsible for the repetitive process of formationand destruction of the mode structure.

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“…where E in is the energy injected into the cavity, R pl (t) is the equivalent resistance, and i pl (t) is the current. The energy of the second shock wave is calculated as follows [25,26]…”

Section: Relationship Between Voltage and Characteristics Of Cavity M...mentioning

confidence: 99%

Analysis of cavities characteristics of underwater pulsed current discharge

Liu¹,

Zhao²,

Yijia³

et al. 2021

Plasma Sources Sci. Technol.

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In order to analyze the motion characteristics of pulsed discharge cavities in water, the process of cavities motion were obtained by a combining shadow method and high-speed camera. Through detailed data analysis and calculation, the theoretical motion process of cavities in water is obtained by the Rayleigh-Plesset model. The comparison between the theoretical results and the experimental data shows that the model can reproduce the motion process of cavities well. The variation trend of pressure and temperature in cavities is given, and the characteristics of the cavitiy motion period, radius and initial energy under different voltages are analyzed. Finally, the mass diffusion and heat transfer are calculated quantitatively. The results provide a basis for analyzing the generation process of secondary shock waves and perfecting the theoretical system of pulsed discharge in water.

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Pushforward transformation of gyrokinetic moments under electromagnetic fluctuations

Cited by 6 publications

References 43 publications

Gyrokinetic simulation of low-frequency Alfvénic modes in DIII-D tokamak

Gyrokinetic simulation of low-frequency Alfvénic modes in DIII-D tokamak

A new paradigm for fast and repetitive chirping of Alfvén eigenmodes

Analysis of cavities characteristics of underwater pulsed current discharge

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