Comparison of langmuir probe and laser thomson scattering methods in the electron temperature measurement in divertor simulator MAP-II

Atsushi Okamoto, S. Kado, Y. Iida, S. Tanaka

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

In order to investigate details of anomaly in the Langmuir probe current (I)-voltage (V) characteristics, electron temperatures and densities are measured by both Langmuir probe and laser Thomson scattering methods. The electron densities measured with both methods show good agreement in hydrogen-molecular assisted recombination (H 2-MAR) plasmas. On the other hand, the electron temperatures measured with Langmuir probe are overestimated compared with that obtained from the Thomson scattering spectrum in the H 2MAR plasmas. Histogram of electron current deviated from its average shows that fluctuation appeared in the electron current becomes large and the histogram distorted in temperature-overestimated condition, especially when the probe voltage is negatively biased.

Original languageEnglish
Pages (from-to)416-421
Number of pages6
JournalContributions to Plasma Physics
Volume46
Issue number5-6
DOIs
Publication statusPublished - 2006 Jul 31

Keywords

  • MAP-II
  • Probe characteristics
  • Recombining plasma
  • Thomson scattering

ASJC Scopus subject areas

  • Condensed Matter Physics

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