Simulation Study of ECCD by GNET with Momentum Conserving Collisional Operator

Hasegawa, Shiori; Murakami, S.; Moriya, Yohei

doi:10.1585/pfr.8.2403083

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…where C, L, S ECH , v , and v d are the linear collision operator, the particle sink term, the ECH heating source [24,25], and the parallel and drift velocities of the electrons, respectively. The GNET code can evaluate the radial current of the supra-thermal electrons induced by ECH, which results in the j return × B force, and the parallel momenta which the supra-thermal electrons transfer to the bulk plasma, i.e., the collisional force.…”

Section: Simulation Modelmentioning

confidence: 99%

Parallel flow driven by electron cyclotron heating in the helically symmetric experiment

Yamamoto¹,

Murakami²,

Chang³

et al. 2022

Nucl. Fusion

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Spontaneous plasma flows have been observed in electron cyclotron heating (ECH) plasmas in the Helically Symmetric Experiment (HSX). A smaller parallel flow was observed in the quasi-helically symmetric configuration compared with that observed in the Mirror configuration, although the Mirror configuration has a larger neoclassical viscosity. Using the GNET code, we evaluate the electromagnetic and collisional forces induced by ECH. We also evaluate the parallel flow driven by the ECH force, by solving the momentum balance equations and Ampère law. The obtained flows show reasonable agreement with results obtained from experiments. This work indicates that the radial electron current generated by ECH could drive the parallel flow.

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Section: Simulation Modelmentioning

confidence: 99%

Parallel flow driven by electron cyclotron heating in the helically symmetric experiment

Yamamoto¹,

Murakami²,

Chang³

et al. 2022

Nucl. Fusion

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show abstract

“…We consider that the right-handed electric field of the EC wave is dominant for Xmode, and the parallel component is dominant for O-mode. Under the limitations, we obtain 21,22…”

Section: Simulation Modelmentioning

confidence: 99%

Effects of electron cyclotron heating on the toroidal flow in LHD plasmas

et al. 2021

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The toroidal force related to electron cyclotron heating (ECH) is investigated in large helical device (LHD) plasmas. When we apply the ECH to the plasma kept by neutral beam injection (NBI) heating, the radial profile of the toroidal flow velocity changes drastically in LHD. ECH-generated supra-thermal electrons can apply forces on the plasma through radial electron current and collisions. We investigate the perturbed electron distribution due to ECH by using the GNET code, which can solve the 5D drift kinetic equation. We also evaluate the electromagnetic force due to radial current and the collisional force driven by ECH. As a result, we find a comparable force driven by ECH to that by NBI heating. The direction of the force is the counter (co) direction radially inside (outside) from the ECH heating location, and these directions correspond with that of experiment results. Finally, we evaluate toroidal flows in ECH and NBI heated plasma solving the radial diffusion equation and compare them with that of experimental observations. We reproduce the co-rotating toroidal flow quantitatively in the balanced-NBIþECH heated case, but we see a difference in the toroidal flow profiles in the co-NBIþECH heated case.

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Influence of the beam-beam collisions on the energetic particle distribution in large helical device

Tahara,

Asai,

Nuga

et al. 2023

Physics of Plasmas

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The influence of Coulomb collisions between energetic particles in a neutral beam injection (NBI)-heated plasma is numerically investigated utilizing the improved collision operator for the orbit-following type of Monte Carlo codes. This nonlinear collision operator enables the collisional effect by non-Maxwellian plasmas including energetic particles to be taken into account. We have implemented it into GNET, one of the orbit-following Monte Carlo codes solving drift kinetic equation in the 5D phase-space, and performed simulations for tangentially injected NBI cases (beam energy: 180 keV), taking account of beam–beam Coulomb collisions. It is found that the beam–beam collisions cause energetic particle orbits to transition from passing to trapped and enhance the collisional transport, which results in the deterioration of the energetic particle confinement.

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Simulation Study of ECCD by GNET with Momentum Conserving Collisional Operator

Cited by 4 publications

References 9 publications

Parallel flow driven by electron cyclotron heating in the helically symmetric experiment

Parallel flow driven by electron cyclotron heating in the helically symmetric experiment

Effects of electron cyclotron heating on the toroidal flow in LHD plasmas

Influence of the beam-beam collisions on the energetic particle distribution in large helical device

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