Detection of anisotropy in the electron velocity distribution produced by electron cyclotron resonance heating using the polarization of helium atom emission lines

The anisotropy in the electron velocity distribution (EVD) was measured using the polarization of two helium atom emission lines, 21P–31D (668 nm) and 23P–33D (588 nm), in a helium electron cyclotron resonance (ECR) discharge plasma. A small polarization degree of less than 4% was measured by adopti...

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Bibliographic Details
Published in:Applied physics letters 2018-05, Vol.112 (21)
Main Authors: Teramoto, Tatsuya, Shikama, Taiichi, Ueda, Akira, Hasuo, Masahiro
Format: Article
Language:English
Subjects:
Anisotropy
Applied physics
Cyclotron resonance
Electron cyclotron resonance
Electron velocity distribution
Emission
Heating
Helium atoms
Kinetic energy
Plasma
Polarization
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Summary:The anisotropy in the electron velocity distribution (EVD) was measured using the polarization of two helium atom emission lines, 21P–31D (668 nm) and 23P–33D (588 nm), in a helium electron cyclotron resonance (ECR) discharge plasma. A small polarization degree of less than 4% was measured by adopting a temporal modulation technique. It was found that the polarization originated locally from around the ECR layer and that the anisotropic component of the EVD produced by ECR heating had an average kinetic energy of approximately 40 eV.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5031051