Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas

T. Nishioka; T. Shikama; S. Nagamizo; K. Fujii; H. Zushi; M. Uchida; A. Iwamae; H. Tanaka; T. Maekawa; M. Hasuo

doi:10.1063/1.4815721

Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas

T. Nishioka, T. Shikama, S. Nagamizo, K. Fujii, H. Zushi, M. Uchida, A. Iwamae, H. Tanaka, T. Maekawa, M. Hasuo

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

3 Scopus citations

Abstract

The anisotropy of the electron velocity distribution function (EVDF) in plasmas can be deduced from the polarization of emissions induced by anisotropic electron-impact excitation. In this paper, we develop a compact thermal lithium atom beam source for spatially resolved measurements of the EVDF anisotropy in electron cyclotron resonance (ECR) plasmas. The beam system is designed such that the ejected beam has a slab shape, and the beam direction is variable. The divergence and flux of the beam are evaluated by experiments and calculations. The developed beam system is installed in an ECR plasma device with a cusp magnetic field, and the LiI 2s-2p emission (670.8 nm) is observed in low-pressure helium plasma. The two-dimensional distributions of the degree and direction of the polarization in the LiI emission are measured by a polarization imaging system. The evaluated polarization distribution suggests the spatial variation of the EVDF anisotropy.

Original language	English
Article number	073509
Journal	Review of Scientific Instruments
Volume	84
Issue number	7
DOIs	https://doi.org/10.1063/1.4815721
State	Published - Jul 2013
Externally published	Yes

Funding

T. Nishioka and T. Shikama are grateful to Professor T. Morisaki at the National Institute for Fusion Science for discussion about the design of the lithium beam source. This work was supported in part by the Grant-in-Aid for Scientific Research (A) No. 21246139 and the Grant-in-Aid for Young Scientists (B) No. 24740367 from the Japan Society for the Promotion of Science, and by the collaborative research program of the Research Institute for Applied Mechanics in Kyushu University.

Funders	Funder number
Research Institute for Applied Mechanics in Kyushu University
Japan Society for the Promotion of Science	24226020, 23656576, 24740367

Access to Document

10.1063/1.4815721

Cite this

Nishioka, T., Shikama, T., Nagamizo, S., Fujii, K., Zushi, H., Uchida, M., Iwamae, A., Tanaka, H., Maekawa, T., & Hasuo, M. (2013). Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas. Review of Scientific Instruments, 84(7), Article 073509. https://doi.org/10.1063/1.4815721

@article{48d60d4406d444dc8491fa3bef8f453f,

title = "Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas",

abstract = "The anisotropy of the electron velocity distribution function (EVDF) in plasmas can be deduced from the polarization of emissions induced by anisotropic electron-impact excitation. In this paper, we develop a compact thermal lithium atom beam source for spatially resolved measurements of the EVDF anisotropy in electron cyclotron resonance (ECR) plasmas. The beam system is designed such that the ejected beam has a slab shape, and the beam direction is variable. The divergence and flux of the beam are evaluated by experiments and calculations. The developed beam system is installed in an ECR plasma device with a cusp magnetic field, and the LiI 2s-2p emission (670.8 nm) is observed in low-pressure helium plasma. The two-dimensional distributions of the degree and direction of the polarization in the LiI emission are measured by a polarization imaging system. The evaluated polarization distribution suggests the spatial variation of the EVDF anisotropy.",

author = "T. Nishioka and T. Shikama and S. Nagamizo and K. Fujii and H. Zushi and M. Uchida and A. Iwamae and H. Tanaka and T. Maekawa and M. Hasuo",

year = "2013",

month = jul,

doi = "10.1063/1.4815721",

language = "English",

volume = "84",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics",

number = "7",

}

Nishioka, T, Shikama, T, Nagamizo, S, Fujii, K, Zushi, H, Uchida, M, Iwamae, A, Tanaka, H, Maekawa, T & Hasuo, M 2013, 'Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas', Review of Scientific Instruments, vol. 84, no. 7, 073509. https://doi.org/10.1063/1.4815721

TY - JOUR

T1 - Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas

AU - Nishioka, T.

AU - Shikama, T.

AU - Nagamizo, S.

AU - Fujii, K.

AU - Zushi, H.

AU - Uchida, M.

AU - Iwamae, A.

AU - Tanaka, H.

AU - Maekawa, T.

AU - Hasuo, M.

PY - 2013/7

Y1 - 2013/7

N2 - The anisotropy of the electron velocity distribution function (EVDF) in plasmas can be deduced from the polarization of emissions induced by anisotropic electron-impact excitation. In this paper, we develop a compact thermal lithium atom beam source for spatially resolved measurements of the EVDF anisotropy in electron cyclotron resonance (ECR) plasmas. The beam system is designed such that the ejected beam has a slab shape, and the beam direction is variable. The divergence and flux of the beam are evaluated by experiments and calculations. The developed beam system is installed in an ECR plasma device with a cusp magnetic field, and the LiI 2s-2p emission (670.8 nm) is observed in low-pressure helium plasma. The two-dimensional distributions of the degree and direction of the polarization in the LiI emission are measured by a polarization imaging system. The evaluated polarization distribution suggests the spatial variation of the EVDF anisotropy.

AB - The anisotropy of the electron velocity distribution function (EVDF) in plasmas can be deduced from the polarization of emissions induced by anisotropic electron-impact excitation. In this paper, we develop a compact thermal lithium atom beam source for spatially resolved measurements of the EVDF anisotropy in electron cyclotron resonance (ECR) plasmas. The beam system is designed such that the ejected beam has a slab shape, and the beam direction is variable. The divergence and flux of the beam are evaluated by experiments and calculations. The developed beam system is installed in an ECR plasma device with a cusp magnetic field, and the LiI 2s-2p emission (670.8 nm) is observed in low-pressure helium plasma. The two-dimensional distributions of the degree and direction of the polarization in the LiI emission are measured by a polarization imaging system. The evaluated polarization distribution suggests the spatial variation of the EVDF anisotropy.

UR - http://www.scopus.com/inward/record.url?scp=84886732399&partnerID=8YFLogxK

U2 - 10.1063/1.4815721

DO - 10.1063/1.4815721

M3 - Article

AN - SCOPUS:84886732399

SN - 0034-6748

VL - 84

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 7

M1 - 073509

ER -

Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this