Plasma and Fusion Research

Volume 3, 059 (2008)

Regular Articles

Development of a Helicon Plasma Source for the Measurement of He* Component in a He0 Beam
Atsushi OKAMOTO, Keisuke IWAZAKI, Takehiro ISONO, Takashi KOBUCHI, Sumio KITAJIMA and Mamiko SASAO
Tohoku University, Sendai, Miyagi 980-8579, Japan
(Received 10 March 2008 / Accepted 12 September 2008 / Published 30 October 2008)

Abstract

A high density plasma source using helicon discharge was designed for the measurement of the population ratio of the metastable state and ground state in a helium neutral beam. The required density of the plasma source was investigated in terms of the rate coefficient relevant to the beam-plasma interaction. The charge-exchange for the metastable state is a dominant process in a beam-energy range of 30-300 keV for the beam attenuation, promising the measurement of the metastable fraction in the helium neutral beam using this plasma source. The first plasma with the electron density of 3.4 × 1012 cm-3 and the electron temperature of 10 eV was successfully produced in argon gas.

Keywords

helium beam, beam attenuation, metastable state, helicon plasma, high density plasma

DOI: 10.1585/pfr.3.059

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This paper may be cited as follows:

Atsushi OKAMOTO, Keisuke IWAZAKI, Takehiro ISONO, Takashi KOBUCHI, Sumio KITAJIMA and Mamiko SASAO, Plasma Fusion Res. 3, 059 (2008).