Numerical study on the effects of magnetic field on helicon plasma waves and energy absorption

Cheng, Yuguo; Cheng, Mengchun; Wang, Moge; Li, Xiaokang

doi:10.7498/aps.63.035203

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…At the same time, the absorption of energy is gradually concentrated at boundary, indicating that a large magnetic field will lead to a serious uneven distribution of radial energy. [27] This situation will not affect the generation of HWP, but will reduce the deposition effect between antenna and plasma. Through calculation and analysis of the magnetic field range of 200 Gs-1800 Gs, it can be obtained that a small magnetic field cannot produce high relative absorption power at center, and thus cannot achieve a good power deposition effect.…”

Section: Numerical Simulation Analysismentioning

confidence: 99%

Influence of magnetic field on power deposition in high magnetic field helicon experiment

Zhou

et al. 2023

Chinese Phys. B

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In this work, based on High Magnetic field Helicon eXperiment (HMHX), HELIC code was used to study the effect of different magnetic fields on the power deposition under parabolic distribution. This paper is divided into three parts: preliminary calculation, actual discharge experiment and calculation. The results of preliminary calculation show that a magnetic field that is too small or too large cannot produce a good power deposition effect. When the magnetic field strength is 1200 Gs, a better power deposition can be obtained. The actual discharge experiment illustrates that the change of the magnetic field will have a certain influence on the discharge phenomenon. Finally, the results of verification calculation successfully verified the accuracy of the results of preliminary simulation. The results show that in the actual discharge experiment, it can achieve the best deposition effect when the magnetic field is 1185 Gs.

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Section: Numerical Simulation Analysismentioning

confidence: 99%

Influence of magnetic field on power deposition in high magnetic field helicon experiment

Zhou

et al. 2023

Chinese Phys. B

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“…功率沉积的原因 [12] . 2023年, 更进一步的分析结果表明大密度梯度引起的模式共振机制可用于电子加热 [13] . 在国内, 成玉国等 [14] 数值分析了径向电子密度呈抛物线型分布情况下径向电、磁场强度及能量沉积特性; 赵高等 [15] 通过实验研究了螺旋波等离子体的放电特性, 获得了射频功率吸收因放电模式转变而变化的方式.…”

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Influence of electron temperature anisotropy on the m = 1 helicon mode power deposition characteristic

Li,

Tang,

Liu

et al. 2024

Acta Phys. Sin.

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As a core phenomenon in helicon discharge, the plasma temperature anisotropy may play a crucial role in helicon wave power deposition. Under radially inhomogeneous plasma circumstances, by employing the warm plasma dielectric tensor model and considering the finite Larmor radius (FLR) effect and plasma temperature anisotropy effect, for the typical helicon discharge parameter conditions, the helicon wave and Trivelpiece-Gould (TG) wave mode coupling characteristic and impact of electron temperature anisotropy on the helicon wave power deposition induced by collisional and Landau damping mechanism are theoretically investigated. Detailed analysis shows that, for typical helicon plasma electron temperature Te =3 eV and low magnetic field B0 =48 G, the electron FLR effect should be considered, while the ion FLR effect can be ignored due to its large inertia effect; compared to the | n |<2 cyclotron harmonics, the contribution of the| n |>1 harmonics in the calculation of plasma dielectric tensor elements can be ignored due to low magnetic field conditions. For the propagation constant, detailed investigation indicates that the phase constant has a maximum value at a certain radial position, near the same position mode coupling between helicon wave and TG wave happens. Fully analysis suggests that the power deposition of the m=1 helicon mode peaked in certain radial position and increased gradually with the increase of the axial electron temperature, besides, compared to the Landau damping, the collisional damping plays a dominant role in the power deposition under current parameter conditions; importantly, the electron temperature anisotropy imposed significant impact on the power deposition characteristic, both the increase and decrease of electron temperature anisotropy factor (χ=Te,⊥/Te,z) can lead to drastic changes in the power deposition intensity. All these conclusions are crucial for us to understand the discharge mechanism of helicon plasma.

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Influence of temperature and pressure gradient on power deposition and field pattern in High Magnetic field Helicon eXperiment

Zhou,

Huang,

2024

Contrib. Plasma Phys

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Based on High Magnetic field Helicon eXperiment, considering the parabolic distribution and Gaussian distribution of radial plasma density, HELIC code was used to study the influence of temperature and pressure gradient on power deposition, electric field, and current density of Helicon Wave Plasma. Three different gradients (positive, negative, and zero gradient) were selected. The results show that positive temperature gradient is beneficial to increase the relative absorption power at the center of plasma. Compared with negative and zero pressure gradients, positive pressure gradient increases the relative absorption power and weakens the current density at the center of plasma, and increases the electric field intensity at the edge of plasma. Larger edge heating will cause the relative absorption power at edge to rise rapidly, which is not conducive to the coupling at the center of plasma. In practical experiments, it is particularly important to reduce the heating effect at edge by cooling the antenna itself. Three different gradients of temperature and pressure have little effect on electric field intensity and current density in plasma, and the variation trend is basically similar, which proves the stability of the antenna mode: m = 1.

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Numerical study on the effects of magnetic field on helicon plasma waves and energy absorption

Cited by 9 publications

References 18 publications

Influence of magnetic field on power deposition in high magnetic field helicon experiment

Influence of magnetic field on power deposition in high magnetic field helicon experiment

Influence of electron temperature anisotropy on the <i>m</i> = 1 helicon mode power deposition characteristic

Influence of temperature and pressure gradient on power deposition and field pattern in High Magnetic field Helicon eXperiment

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