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

doi:10.1143/JJAP.27.635

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

Electrical Engineering Sciences

Research output: Contribution to journal › Article › peer-review

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Abstract

The possibility of an instantaneous determination of the Balmer alpha (H_α) 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 H_αline 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 H_αprofile 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 language	English
Pages (from-to)	635-641
Number of pages	7
Journal	Japanese journal of applied physics
Volume	27
Issue number	4R
DOIs	https://doi.org/10.1143/JJAP.27.635
Publication status	Published - Apr 1988

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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

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.",

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T1 - Observation of balmer-alpha line profile of hydrogen atoms in plasmas by rapid-frequency-scan laser spectroscopy

AU - Honda, Chikahisa

AU - Maeda, Mitsuo

AU - Uchino, Kiichiro

AU - Muraoka, Katsunori

AU - Akazaki, Masanori

PY - 1988/4

Y1 - 1988/4

N2 - 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.

AB - 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.

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

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