Plasma and Fusion Research

Volume 13, 1201099 (2018)

Rapid Communications

Thomson Scattering Measurement of Two Electron Temperature Components in Transition to Detached Plasmas
Hiroshi OHSHIMA, Shin KAJITA1), Hirohiko TANAKA, Noriyasu OHNO and Hennie J. VAN DER MEIDEN2)
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
1)
Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2)
DIFFER, Dutch Institute for Fundamental Energy Research, Eindhoven, The Netherlands
(Received 2 March 2018 / Accepted 27 June 2018 / Published 10 August 2018)

Abstract

We have performed laser Thomson scattering (LTS) measurements during the transition between attached and detached helium plasmas in the linear divertor simulator NAGDIS-II. In the detached plasma, the LTS spectrum shows a discrepancy with a single Gaussian function. The discrepancy is resolved by the spectrum fitting with a sum of two Gaussian functions, indicating that the electron energy distribution contains two different temperature components.

Keywords

electron energy distribution, detached plasma, plasma diagnostic, Thomson scattering, NAGDIS-II

DOI: 10.1585/pfr.13.1201099

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