Axial profiles of argon helicon plasma by optical emission spectroscope and Langmuir probe

Huihui WANG (王慧慧); Zun ZHANG (张尊); Kaiyi YANG (杨凯翼); Chang TAN (谭畅); Ruilin CUI (崔瑞林); Jiting OUYANG (欧阳吉庭)

doi:10.1088/2058-6272/ab175b

Plasma Science and Technology > 2019 > 21(7): 74009-074009. > DOI: 10.1088/2058-6272/ab175b

Huihui WANG (王慧慧), Zun ZHANG (张尊), Kaiyi YANG (杨凯翼), Chang TAN (谭畅), Ruilin CUI (崔瑞林), Jiting OUYANG (欧阳吉庭). Axial profiles of argon helicon plasma by optical emission spectroscope and Langmuir probe[J]. Plasma Science and Technology, 2019, 21(7): 74009-074009. DOI: 10.1088/2058-6272/ab175b

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Axial profiles of argon helicon plasma by optical emission spectroscope and Langmuir probe

¹ School of Physics, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
² Shanxi Key Laboratory of Plasma Physics and Applied Technology, Xi’an Aerospace Propulsion Institute, Xi’an 710100, People’s Republic of China

Funds: This study was partly supported by National Natural Science Foundation of China (Nos. 11475131, 11805011).

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Received Date: November 18, 2018

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Abstract

Abstract

We present the axial profiles of argon helicon plasma measured by a local optical emission spectroscope (OES) and Langmuir RF-compensated probe. The results show that the emission intensity of the argon atom lines (750 nm, 811 nm) is proportional to the plasma density determined by the Langmuir probe. The axial profile of helicon plasma depends on the discharge mode which changes with the RF power. Excited by helical antenna, the axial distribution of plasma density is similar to that of the external magnetic field in the capacitive coupled mode (E-mode). As the discharge mode changes into the inductively coupled mode (H-mode), the axial distribution of plasma density in the downstream can still be similar to that of the external magnetic field, but becomes more uniform in the upstream. When the discharge entered wave coupled mode (W-mode), the plasma becomes nearly uniform along the axis, showing a completely different profile from the magnetic field. The W-mode is expected to be a mixed pattern of helicon (H) and Trivelpiece-Gould (TG) waves.
- helicon plasma,
- local OES,
- Langmuir RF-compensated probe,
- mode transition,
- axial profile

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References

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Axial profiles of argon helicon plasma by optical emission spectroscope and Langmuir probe