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

Research output: Contribution to journalArticle

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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 - Dec 1 1991

Fingerprint

high temperature plasmas
laser induced fluorescence
Photons
Fluorescence
Plasmas
Hydrogen
Lasers
photons
hydrogen
fluorescence
Temperature
Stray light
signal to noise ratios
Laser excitation
laser beams
filters
optimization
Laser beams
Signal to noise ratio
excitation

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Application of two-photon-excited laser-induced fluorescence to atomic hydrogen measurements in the edge region of high-temperature plasmas. / Kajiwara, Toshinori; Shinkawa, Tatsuya; Uchino, Kiichiro; Masuda, Mitsuharu; Muraoka, Katsunori; Okada, Tatsuo; Maeda, Mitsuo; Sudo, Sigeru; Obiki, Tokuhiro.

In: Review of Scientific Instruments, Vol. 62, No. 10, 01.12.1991, p. 2345-2349.

Research output: Contribution to journalArticle

Kajiwara, Toshinori ; Shinkawa, Tatsuya ; Uchino, Kiichiro ; Masuda, Mitsuharu ; Muraoka, Katsunori ; Okada, Tatsuo ; Maeda, Mitsuo ; Sudo, Sigeru ; Obiki, Tokuhiro. / Application of two-photon-excited laser-induced fluorescence to atomic hydrogen measurements in the edge region of high-temperature plasmas. In: Review of Scientific Instruments. 1991 ; Vol. 62, No. 10. pp. 2345-2349.
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AU - Masuda, Mitsuharu

AU - Muraoka, Katsunori

AU - Okada, Tatsuo

AU - Maeda, Mitsuo

AU - Sudo, Sigeru

AU - Obiki, Tokuhiro

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