An extreme ultraviolet spectroscopic diagnostic for fluctuations of electron density and temperature in tokamak plasmas

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347010· OSTI ID:6096226

Huang, L K; Finkenthal, M; Bhatia, A K; Moos, H W ^[1]

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

Extreme ultraviolet (XUV) spectral line emissivities, originating from resonant transitions with upper states excited mainly from ground or both ground and lowest metastable states by electron collisional excitations of highly ionized intrinsic impurities in tokamak plasmas, are linear functions of both electron density and temperature fluctuations, {ital {tilde n}}{sub {ital e}} and {ital {tilde T}}{sub {ital e}}, when the fluctuations are small and at high frequency. Correlations between measured intensities of spectral lines can thus provide localized measurements of the fluctuations. Newly developed XUV monochromators of high throughput enable accurate and fast diagnostics of {ital {tilde n}}{sub {ital e}} and {ital {tilde T}}{sub {ital e}} for the study of the tokamak plasma microturbulence.

• OSTI ID: 6096226
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:11; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
AMPLITUDES
CLOSED PLASMA DEVICES
COLLISIONS
CORRELATIONS
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON DENSITY
ELECTRON TEMPERATURE
EXTREME ULTRAVIOLET RADIATION
FLUCTUATIONS
PLASMA DIAGNOSTICS
RADIATIONS
SPECTROSCOPY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
ULTRAVIOLET RADIATION
VARIATIONS