Thomson Scattering Measurement of Two Electron Temperature Components in Transition to Detached Plasmas

Hiroshi OHSHIMA; Shin KAJITA; Hirohiko TANAKA; Noriyasu OHNO; Hennie J. VAN DER MEIDEN

doi:10.1585/pfr.13.1201099

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Thomson Scattering Measurement of Two Electron Temperature Components in Transition to Detached Plasmas

Hiroshi OHSHIMA, Shin KAJITA, Hirohiko TANAKA, Noriyasu OHNO, Hennie J. VAN DER MEIDEN

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

JOURNAL FREE ACCESS

2018 Volume 13 Pages 1201099

DOI https://doi.org/10.1585/pfr.13.1201099

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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.

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