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Title: Development of a compact thermal lithium atom beam source for measurements of electron velocity distribution function anisotropy in electron cyclotron resonance plasmas.
Authors: Nishioka, T
Shikama, T  kyouindb  KAKEN_id
Nagamizo, S
Fujii, K  kyouindb  KAKEN_id
Zushi, H
Uchida, M  kyouindb  KAKEN_id
Iwamae, A
Tanaka, H  kyouindb  KAKEN_id
Maekawa, T  KAKEN_id
Hasuo, M  kyouindb  KAKEN_id
Author's alias: 四竈, 泰一
Issue Date: 23-Jul-2013
Publisher: AIP Publishing
Journal title: The Review of scientific instruments
Volume: 84
Issue: 7
Thesis number: 073509
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.
Rights: © 2013 AIP Publishing LLC
DOI(Published Version): 10.1063/1.4815721
PubMed ID: 23902065
Appears in Collections:Journal Articles

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