Toroidicity effects on the absorption of IC waves by electrons

Brambilla, M.; Bilato, R.

doi:10.1088/1741-4326/ab9fa7

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…In order to effectively solve the full-wave equation in hot plasmas, Fourier decomposition of the wave fields is necessary. For example, the TORIC code employs spectral representation of the wave fields in the poloidal and toroidal directions while applying the finite element method (FEM) in the radial direction [10][11][12][13]. The AORSA code applies the Fourier collocation method in three directions (horizontal, vertical and toroidal) [14].…”

Section: Introductionmentioning

confidence: 99%

An alternative method to mimic mode conversion for ion cyclotron resonance heating

Zhang,

Qin

et al. 2023

Nucl. Fusion

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Ion cyclotron range of frequency waves in hot plasmas exhibit spatial dispersion effects and the wave equation takes the integro-differential form. Under the local plasma model assumption, the wave equation can be simplified to the differential form and adapts to the numerical scheme of the finite element method (FEM). Even though direct absorption of fast waves by ions and electrons can be described well by the local plasma model, linear mode conversion associated with non-local effects is absent. To deal with this issue, an alternative method is put forward in this paper where quasi-electrostatic fluid waves based on the multi-fluid warm plasma model are employed to take the place of ion Bernstein waves in mode conversion. On this basis, an interative fluid-kinetics (INTFLUK) code based on the FEM is developed for full-wave simulation in hot plasmas. Derivation of the wave equations as well as benchmarking of the INTFLUK code against other wave simulation codes are carried out. In both one- and two-dimensional cases, the validity of the INTFLUK code was verified by comparison of the wave field distributions and power deposition. As a useful illustration of the INTFLUK code including the scrape-off layer and a realistic antenna, the influence of the poloidal antenna phasing difference on ion cyclotron resonance heating is analyzed. Finally, it should be noted that the method in this paper has the potential to be extended to the three-dimensional case, which will be considered in the near future.

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Section: Introductionmentioning

confidence: 99%

An alternative method to mimic mode conversion for ion cyclotron resonance heating

Zhang,

Qin

et al. 2023

Nucl. Fusion

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Reinterpreting radio frequency heating and current drive theory in a tokamak

Catto

2024

J. Plasma Phys.

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Quasilinear treatments are widely used for tokamaks to evaluate radio frequency (rf) heating and current drive. Even though the core of a tokamak plasma is weakly collisional, the solution of the linearized kinetic equation is evaluated using unperturbed collisionless trajectories while often treating successive poloidal circuits of the passing (and trapped) particles as uncorrelated or nearly so. In addition, the most important effect of tokamak geometry, the mirror force, is usually mistreated or ignored when obtaining the solution. These concerning aspects of rf treatments are clarified by considering lower hybrid heating and current drive to illustrate that the electrons in resonance with the applied rf are enclosed by narrow collisional boundary layers, and that tokamak geometry makes it necessary to retain poloidal variation when solving a weakly collisional linearized kinetic equation. Other aspects such as collisional boundary layers at the trapped–passing boundary, cyclotron resonances, and the limitations of quasilinear theory are also considered. The new insights lead to a fundamentally different formulation and interpretation of the solution of the linearized Fokker–Planck equation used for rf quasilinear theory in a tokamak, while retaining many of the features that have contributed to its successful application to rf heating and current drive.

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Toroidicity effects on the absorption of IC waves by electrons

Cited by 2 publications

References 18 publications

An alternative method to mimic mode conversion for ion cyclotron resonance heating

An alternative method to mimic mode conversion for ion cyclotron resonance heating

Reinterpreting radio frequency heating and current drive theory in a tokamak

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