Doppler shift measurement of Balmer-alpha line spectrum emission from a plasma in a negative hydrogen ion source

Journal Article · Wed Apr 08 04:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4916411· OSTI ID:22391394

Doi, K. ^[1]; Kisaki, M.; Nakano, H.; Tsumori, K. ^[2]; Nishiura, M. ^[3]

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1. Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 Japan (Japan)
2. National Institute for Fusion Science, Toki, Gifu (Japan)
3. Graduate School of Frontier Sciences, The Universtiy of Tokyo, Chiba 277-8561 (Japan)

Balmer-α light emission from the extraction region of the LHD one-third ion source has shown a characteristic Doppler broadening in the wavelength spectrum detected by a high resolution spectrometer. The spectrum resembles Gaussian distribution near the wavelength of the intensity peak, while it has an additional component of a broader foot. The measured broadening near the wavelength of the intensity peak corresponds to 0.6 eV hydrogen atom temperature. The spectrum exhibits a larger expansion in the blue wing which becomes smaller when the line of sight is tilted toward the driver region from the original observation axis parallel to the plasma grid. A surface collision simulation model predicts the possibility of hydrogen reflection at the plasma grid surface to form a broad Balmer-α light emission spectrum.

• OSTI ID: 22391394
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1655; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
COMPUTERIZED SIMULATION
DOPPLER BROADENING
EMISSION SPECTRA
EV RANGE
GAUSS FUNCTION
HYDROGEN
HYDROGEN IONS
ION SOURCES
LHD DEVICE
PLASMA
REFLECTION
SURFACES
VISIBLE RADIATION