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Title: Polarization separated Zeeman spectra from magnetic dipole transitions in highly charged argon in the large helical device

Abstract

Visible spectral emission lines from magnetic dipole transitions in Ar X, Ar XI, Ar XIV, and Ar XV are observed from plasmas heated with neutral-beam injection (NBI) in the Large Helical Device [O. Motojima et al., Phys. Plasmas 6, 1843 (1999)]. Orthogonal linearly polarized components of the emission line profiles are observed with a polarization separation optical system and high-resolution spectrometer. Zeeman split profiles reveal polarization characteristics of magnetic dipole transitions. Ion temperatures and emission locations are estimated from the profiles with the magnetic field information on the lines of sight (LOS). The spatially resolved emissions are observed by the array of absolutely calibrated views. The time histories of line profiles and emission intensities at the poloidal view are presented. The observed line profiles and the intensity distribution at the poloidal view indicate the localization of these charge states in the edge region just inside the last closed flux surface. The emission line of Ar X in the tangential observation indicates Doppler shifts of the Zeeman split profiles. The velocity components of Ar X ion flow along the LOS at the tangential view are 7.7 and 2.0 km/s at the outer and inner edge plasmas, respectively, in the opposite directionmore » to the NBI.« less

Authors:
; ; ; ; ;  [1];  [2];  [2]
  1. Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto, 606-8501 (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
20974933
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 4; Other Information: DOI: 10.1063/1.2714506; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; CHARGE STATES; DOPPLER EFFECT; ELECTRON TEMPERATURE; EMISSION; ION TEMPERATURE; LHD DEVICE; M1-TRANSITIONS; MAGNETIC SURFACES; OPTICAL SYSTEMS; PLASMA; PLASMA BEAM INJECTION; PLASMA CONFINEMENT; PLASMA DIAGNOSTICS; POLARIZATION; SPECTRA; SPECTROMETERS; STELLARATORS; ZEEMAN EFFECT

Citation Formats

Iwamae, A., Atake, M., Sakaue, A., Katai, R., Goto, M., Morita, S., Department of Fusion Science, Graduate University for Advanced Studies, Toki, 509-5292, and National Institute for Fusion Science, Toki, 509-5292. Polarization separated Zeeman spectra from magnetic dipole transitions in highly charged argon in the large helical device. United States: N. p., 2007. Web. doi:10.1063/1.2714506.
Iwamae, A., Atake, M., Sakaue, A., Katai, R., Goto, M., Morita, S., Department of Fusion Science, Graduate University for Advanced Studies, Toki, 509-5292, & National Institute for Fusion Science, Toki, 509-5292. Polarization separated Zeeman spectra from magnetic dipole transitions in highly charged argon in the large helical device. United States. doi:10.1063/1.2714506.
Iwamae, A., Atake, M., Sakaue, A., Katai, R., Goto, M., Morita, S., Department of Fusion Science, Graduate University for Advanced Studies, Toki, 509-5292, and National Institute for Fusion Science, Toki, 509-5292. Sun . "Polarization separated Zeeman spectra from magnetic dipole transitions in highly charged argon in the large helical device". United States. doi:10.1063/1.2714506.
@article{osti_20974933,
title = {Polarization separated Zeeman spectra from magnetic dipole transitions in highly charged argon in the large helical device},
author = {Iwamae, A. and Atake, M. and Sakaue, A. and Katai, R. and Goto, M. and Morita, S. and Department of Fusion Science, Graduate University for Advanced Studies, Toki, 509-5292 and National Institute for Fusion Science, Toki, 509-5292},
abstractNote = {Visible spectral emission lines from magnetic dipole transitions in Ar X, Ar XI, Ar XIV, and Ar XV are observed from plasmas heated with neutral-beam injection (NBI) in the Large Helical Device [O. Motojima et al., Phys. Plasmas 6, 1843 (1999)]. Orthogonal linearly polarized components of the emission line profiles are observed with a polarization separation optical system and high-resolution spectrometer. Zeeman split profiles reveal polarization characteristics of magnetic dipole transitions. Ion temperatures and emission locations are estimated from the profiles with the magnetic field information on the lines of sight (LOS). The spatially resolved emissions are observed by the array of absolutely calibrated views. The time histories of line profiles and emission intensities at the poloidal view are presented. The observed line profiles and the intensity distribution at the poloidal view indicate the localization of these charge states in the edge region just inside the last closed flux surface. The emission line of Ar X in the tangential observation indicates Doppler shifts of the Zeeman split profiles. The velocity components of Ar X ion flow along the LOS at the tangential view are 7.7 and 2.0 km/s at the outer and inner edge plasmas, respectively, in the opposite direction to the NBI.},
doi = {10.1063/1.2714506},
journal = {Physics of Plasmas},
number = 4,
volume = 14,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}