Observation of balmer-alpha line profile of hydrogen atoms in plasmas by rapid-frequency-scan laser spectroscopy

Chikahisa Honda, Mitsuo Maeda, Kiichiro Uchino, Katsunori Muraoka, Masanori Akazaki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The possibility of an instantaneous determination of the Balmer alpha (Hα) line profile of hydrogen atoms in large plasma devices by rapid-frequency-scan (RAFS) laser spectroscopy is discussed. A detailed analysis of the SN ratio shows that, although the SN ratio in Hαline profile measurements by RAFS is smaller than those in neutral hydrogen density measurements, a remarkable improvement can be obtained by the choice of the optimum saturation parameter and the long-pulse operation. Based on the experiment of the Hαprofile measurement in a hydrogen DC glow discharge plasma by RAFS, the profile distortion in saturated excitation is evaluated. The SN ratio in the profile measurement by RAFS for Heliotron E plasma is estimated from the data on the neutral density measurement.

Original languageEnglish
Pages (from-to)635-641
Number of pages7
JournalJapanese Journal of Applied Physics
Volume27
Issue number4R
DOIs
Publication statusPublished - Apr 1988

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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