A concept of negative ion flow velocity measurement using a laser photodetachment velocimetry (LPDV)

S. Kado, S. Kajita, T. Shikama, Y. Iida, D. Yamasaki, Atsushi Okamoto, S. Tanaka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A concept of the thermal and flow velocities measurement for negative ions by means of a laser photodetachment technique, laser photodetachment velocimetry (LPDV), is presented. The difference in the temporal evolution of the photodetached excess electron current between the upstream and the downstream regions corresponds to the flow velocity, while the average of the recovery times corresponds to the thermal velocity, namely the negative ion temperature. Initial results in a divertor/edge plasma simulator MAP(material and plasma)-II suggest that the parallel flow velocity is small in the periphery of the linear plasma column where the negative ions exist. The negative ion temperature is similar to that of helium ion obtained for helium discharges.

Original languageEnglish
Pages (from-to)367-372
Number of pages6
JournalContributions to Plasma Physics
Volume46
Issue number5-6
DOIs
Publication statusPublished - 2006 Jul 31

Keywords

  • Divertor simulator
  • Flow measurement
  • MAP-II
  • Negative ion velocity
  • Photodetachment
  • Plasma flow
  • Velocimetry

ASJC Scopus subject areas

  • Condensed Matter Physics

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