Computed circular polarization of line emissions for. Delta. n =1 transitions between highly excited states of hydrogenic ions in tokamak plasmas

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Physical Review (Section) A: General Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevA.40.5224· OSTI ID:5349288

Huang, L K; Wroblewski, D; Finkenthal, M; Moos, H W ^[1]

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1. Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218 (US)

Circular polarization of spectral lines due to {Delta}{ital n}=1 transitions between highly excited states ({ital n}=6--8) of low-{ital Z} hydrogenic ions (C VI and O VIII) has been computed under tokamak plasma conditions. The numerical model includes relativistic corrections, the Zeeman effect, the motional Stark effect, and Doppler broadening. The motional Stark effect in spectral line profiles is negligible because of Doppler broadening. The Zeeman effect is described by the intensity-averaged splitting factor, which is equal to unity and independent of the Stark effect for all Rydberg lines (provided the {ital n} shells are well separated). The circular polarization of the line is proportional to the component of the magnetic field in the direction of the observation direction. An analytical expression for the polarization, as a function of the intensity-averaged Zeeman splitting and a characteristic linewidth, is formulated by fitting the numerical results obtained for a variety of plasma conditions and spectral lines.

• OSTI ID: 5349288
• Journal Information: Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:9; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ATOMS
CARBON IONS
CHARGED PARTICLES
CLOSED PLASMA DEVICES
CORRECTIONS
COUPLING
EIGENVALUES
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
HOT PLASMA
INTERMEDIATE COUPLING
IONS
ISOELECTRONIC ATOMS
L-S COUPLING
LINE WIDTHS
MULTICHARGED IONS
OXYGEN IONS
PLASMA
PLASMA DIAGNOSTICS
RECOMBINATION
RYDBERG STATES
SPECTROSCOPY
STARK EFFECT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
ZEEMAN EFFECT