Polarization separated Zeeman spectra from magnetic dipole transitions in highly charged argon in the large helical device
- Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto, 606-8501 (Japan)
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.
- OSTI ID:
- 20974933
- Journal Information:
- Physics of Plasmas, Vol. 14, Issue 4; Other Information: DOI: 10.1063/1.2714506; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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