Application of two-photon-excited laser-induced fluorescence to atomic hydrogen measurements in the edge region of high-temperature plasmas

Toshinori Kajiwara, Tatsuya Shinkawa, Kiichiro Uchino, Mitsuharu Masuda, Katsunori Muraoka, Tatsuo Okada, Mitsuo Maeda, Sigeru Sudo, Tokuhiro Obiki

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11 Citations (Scopus)

Abstract

A two-photon-excited laser-induced fluorescence (LIF) was applied to measurement of atomic hydrogen densities in the edge region of high-temperature plasmas of Heliotron E for the first time. In this application, fluorescence signals were observed coaxially to the laser beam. This was possible because, in two-photon-excitation LIF, the visible fluorescence is localized at the laser focus and stray light can be completely eliminated by optical spatial filters, allowing much easier optical access than in previous LIF experiments. The densities at the initiation of the discharge and at the quasisteady state of the discharge were determined to be 3 X 1016 and 1 X 1016 m-3, respectively within an error of a factor of 2. Optimization to maximize the signal-to-noise ratio of the observation and resulting detection limit were discussed and confirmed the above results.

Original languageEnglish
Pages (from-to)2345-2349
Number of pages5
JournalReview of Scientific Instruments
Volume62
Issue number10
DOIs
Publication statusPublished - 1991

All Science Journal Classification (ASJC) codes

  • Instrumentation

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