The Effect of Key Parameters on Power Absorption in Helicon Plasma Sources

Fazelpour, S.; Sadeghi, H.; Chakhmachi, Amir; Iraji, D.; Omrani, Malihe; Zare, Mohadeseh

doi:10.1109/tps.2020.3003090

Cited by 9 publications

(2 citation statements)

References 50 publications

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“…Chi et al [37] found that the increase in pressure can reduce the power required for the mode transition. Fazelpour et al [38] explored the dominant role of different heating mechanisms at different neutral pressures. When the neutral pressure was high (>2 mTorr), the collision mechanism was dominant in the plasma due to the high plasma density [39].…”

Section: Introductionmentioning

confidence: 99%

Effect of neutral pressure on the blue core in Ar helicon plasma under an inhomogeneous magnetic field

Wang

Liu²,

Sun³

et al. 2023

Plasma Sci. Technol.

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The effect of neutral pressure on blue core in Ar helicon plasma under inhomogeneous magnetic field was investigated in this work. The neutral pressure was set to 0.08 Pa, 0.36 Pa and 0.68 Pa. Nikon camera, intensifies charge coupled device (ICCD), optical emission spectrometer (OES), and Langmuir probe were used to diagnose the blue core in helicon plasma. Helicon plasma discharges experienced density jumps from E-, H- to W-mode before power just rose to 200 W. The plasma density increased and maintained the central peak with the increase of neutral pressure. However, the brightness of the blue core gradually decreased. It demonstrated that the relative intensity of Ar II spectral lines and the ionization ratio in the central area were reduced. Radial electron temperature profiles were flattened and became hollow as neutral pressure increased. It demonstrated that increasing the neutral pressure weakened the central heating efficiency dominated by helicon wave and strengthened the edge heating efficiency governed by the TG wave and skin effect. Therefore, the present experiment successfully reveals how the neutral pressure affects the heating mechanism of helicon plasma in inhomogeneous magnetic field.

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Section: Introductionmentioning

confidence: 99%

Effect of neutral pressure on the blue core in Ar helicon plasma under an inhomogeneous magnetic field

Wang

Liu²,

Sun³

et al. 2023

Plasma Sci. Technol.

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show abstract

“…Helicon plasma sources are widely used for many applications in various fields, such as semiconductor industries, plasma thrusters, scientific studies, due to their high ionisation efficiency and easy operation [1][2][3][4][5][6][7][8]. Helicon waves (HWs) have a frequency between the frequency of ion and electron cyclotrons, and its dispersion relationship reveals that the plasma density is proportional to axial wavenumbers [9].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of density linear control in a helicon plasma source with tunable antenna wavenumber spectra

Zhu

Zheng

et al. 2021

Plasma Sources Sci. Technol.

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The helicon plasma source is widely used in various fields due to its high ionisation rate. The helicon wave dispersion relationship indicates that the density is proportional to axial wavenumbers. In this study, we systematically investigated how the plasma density varies with the axial wavenumber by employing several phased antenna systems. The antenna comprised different numbers of loops, and each loop was connected to an individual radio frequency power source. We adjusted the plasma density from approximately 10 11 to 10 13 cm −3 . Such two orders of magnitude adjustments may provide a novel operation mode for helicon applications. The density was linearly proportional to the axial wavenumber, when the axial wavenumber was not exceptionally large. In addition, in a low magnetic field, density peaks were observed in all three antenna configurations. The density peak appears irrespective of whether the Landau damping frequency is higher than collision frequency. This finding suggested that Landau damping and other mechanisms can lead to such a phenomenon of low field density peak.

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Design and simulation of the high efficiency ion source for Damavand NBI heating system

Fazelpour

Sadeghi

Chakhmachi

et al. 2022

Fusion Engineering and Design

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The Effect of Key Parameters on Power Absorption in Helicon Plasma Sources

Cited by 9 publications

References 50 publications

Effect of neutral pressure on the blue core in Ar helicon plasma under an inhomogeneous magnetic field

Effect of neutral pressure on the blue core in Ar helicon plasma under an inhomogeneous magnetic field

Characterisation of density linear control in a helicon plasma source with tunable antenna wavenumber spectra

Design and simulation of the high efficiency ion source for Damavand NBI heating system

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