[Table of Contents]

Plasma and Fusion Research

Volume 2, S1072 (2007)

Regular Articles

Helium Measurements using the Pellet Charge Exchange in Large Helical Device
T. OZAKI, P. GONCHAROV, E. VESCHEV1), S. SUDO, N. TAMURA, TESPEL Group and LHD Experimental Group
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
1)
Graduate University for Advanced Studies, Hayama, Kanagawa, 240-0193, Japan
(Received 3 December 2006 / Accepted 22 March 2007 / Published 20 November 2007)

Abstract

In Large Helical Device (LHD), it is possible to perform the simulation experiment of the α particle heating by using the ion cyclotron resonance heating (ICH) because high-energy particle generated by ICH is well confined in the plasma. The neutral particles (mainly hydrogen), which are generated by the charge exchange between the high-energy ion and the background neutrals, can be observed by using them. However a few neutral helium particles can be observed since fully ionized helium like α particle can emit only by double charge exchange process. Therefore we also introduce the pellet charge exchange system (PCX). The diagnostic pellet is injected to the plasma in order to obtain the charge exchange neutral particle, which is produced by the charge exchange reaction between the ablated pellet cloud and high-energetic particle. The helium distribution measurement in helium plasma is also demonstrated.

Keywords

helium, PCX, TESPEL, CNPA, plate voltage, ICH, LHD, resonance, SD-NPA, He/H ratio

DOI: 10.1585/pfr.2.S1072

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This paper may be cited as follows:

T. OZAKI, P. GONCHAROV, E. VESCHEV, S. SUDO, N. TAMURA, TESPEL Group and LHD Experimental Group, Plasma Fusion Res. 2, S1072 (2007).