On the mechanism of density peak at low magnetic field in argon helicon plasmas

Wanying Zhu; Ruilin Cui; Feng He; Tianliang Zhang; Jiting Ouyang

doi:10.1063/5.0091471

On the mechanism of density peak at low magnetic field in argon helicon plasmas

Wanying Zhu, Ruilin Cui, Feng He^*, Tianliang Zhang, Jiting Ouyang^*

^*Corresponding author for this work

School of Physics

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Helicon plasma density may show a non-monotonic dependence on the magnetic field at low strength, so-called "low-field peak (LFP)."We presented the multiple LFPs and the formation mechanism in argon helicon plasmas in this paper. Propagating conditions of helicon (H) and Trivelpiece-Gould (TG) waves in collisional plasmas were calculated based on the dispersion relation. It is demonstrated that there are two mechanisms during mode transition responsible for LFP, i.e., resonance of H- and TG-waves and anti-resonance of TG-wave. Especially, H-TG resonance of the highest axial mode in the helicon plasma results in a density jump rather than a density peak due to the mode transition from non-wave to co-H/TG-wave mode. Higher plasma density in lower magnetic fields is helpful for achievement of multiple LFPs in argon helicon plasmas.

Original language	English
Article number	093511
Journal	Physics of Plasmas
Volume	29
Issue number	9
DOIs	https://doi.org/10.1063/5.0091471
Publication status	Published - 1 Sept 2022

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title = "On the mechanism of density peak at low magnetic field in argon helicon plasmas",

abstract = "Helicon plasma density may show a non-monotonic dependence on the magnetic field at low strength, so-called {"}low-field peak (LFP).{"}We presented the multiple LFPs and the formation mechanism in argon helicon plasmas in this paper. Propagating conditions of helicon (H) and Trivelpiece-Gould (TG) waves in collisional plasmas were calculated based on the dispersion relation. It is demonstrated that there are two mechanisms during mode transition responsible for LFP, i.e., resonance of H- and TG-waves and anti-resonance of TG-wave. Especially, H-TG resonance of the highest axial mode in the helicon plasma results in a density jump rather than a density peak due to the mode transition from non-wave to co-H/TG-wave mode. Higher plasma density in lower magnetic fields is helpful for achievement of multiple LFPs in argon helicon plasmas.",

author = "Wanying Zhu and Ruilin Cui and Feng He and Tianliang Zhang and Jiting Ouyang",

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T1 - On the mechanism of density peak at low magnetic field in argon helicon plasmas

AU - Zhu, Wanying

AU - Cui, Ruilin

AU - He, Feng

AU - Zhang, Tianliang

AU - Ouyang, Jiting

PY - 2022/9/1

Y1 - 2022/9/1

N2 - Helicon plasma density may show a non-monotonic dependence on the magnetic field at low strength, so-called "low-field peak (LFP)."We presented the multiple LFPs and the formation mechanism in argon helicon plasmas in this paper. Propagating conditions of helicon (H) and Trivelpiece-Gould (TG) waves in collisional plasmas were calculated based on the dispersion relation. It is demonstrated that there are two mechanisms during mode transition responsible for LFP, i.e., resonance of H- and TG-waves and anti-resonance of TG-wave. Especially, H-TG resonance of the highest axial mode in the helicon plasma results in a density jump rather than a density peak due to the mode transition from non-wave to co-H/TG-wave mode. Higher plasma density in lower magnetic fields is helpful for achievement of multiple LFPs in argon helicon plasmas.

AB - Helicon plasma density may show a non-monotonic dependence on the magnetic field at low strength, so-called "low-field peak (LFP)."We presented the multiple LFPs and the formation mechanism in argon helicon plasmas in this paper. Propagating conditions of helicon (H) and Trivelpiece-Gould (TG) waves in collisional plasmas were calculated based on the dispersion relation. It is demonstrated that there are two mechanisms during mode transition responsible for LFP, i.e., resonance of H- and TG-waves and anti-resonance of TG-wave. Especially, H-TG resonance of the highest axial mode in the helicon plasma results in a density jump rather than a density peak due to the mode transition from non-wave to co-H/TG-wave mode. Higher plasma density in lower magnetic fields is helpful for achievement of multiple LFPs in argon helicon plasmas.

UR - https://www.scopus.com/pages/publications/85139158922

U2 - 10.1063/5.0091471

DO - 10.1063/5.0091471

M3 - Article

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SN - 1070-664X

VL - 29

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 9

M1 - 093511

ER -

On the mechanism of density peak at low magnetic field in argon helicon plasmas

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