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Spectroscopic study of edge poloidal rotation and radial electric fields in the DIII-D tokamak [electronic resource].

Published
Washington, D.C : United States. Dept. of Energy. Office of Energy Research, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (22 pages) : digital, PDF file
Additional Creators
General Atomic Company, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Doppler-shift spectroscopy has shown that finite values of poloidal rotation velocity υ{sub θ} and of radial electric field E{sub r} exist at the edge of a tokamak plasma and that dramatic increases occur in these parameters at an L-H transition. E{sub r} is negative in the L-mode and becomes more negative in the H-mode; υ{sub θ} increases in magnitude at the transition. In addition, the radial gradients (shear) of υ{sub θ} and E{sub r} are large and these gradients also increase at the L-H transition. These results are based on measurements of Doppler shifts of light emitted by He II ions, located in a region about 1--3 cm inside the separatrix. These observations have been made with horizontally-viewing and vertically-viewing spectrometer systems on the DIII-D tokamak. The nearly orthogonal views of these systems are used to determine the plasma's flow velocity in terms of the orthogonal sets υ{sub θ} and υ{sub φ} or of υ{sub ⊥} and υ{sub ∥}. Knowledge of υ{sub ⊥} is used to calculate E{sub r} from the force balance equation for a single ion species. The existing results impose constraints on theories of the L-H transition. More detailed studies of the spatial profiles and temporal evolution of υ{sub θ} and E{sub r} will be made with upgraded instrumentation, which is now coming on-line. 28 refs.
Report Numbers
E 1.99:ga-a-20100
E 1.99: conf-900557--28
conf-900557--28
ga-a-20100
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
10/01/1990.
"ga-a-20100"
" conf-900557--28"
"DE91002706"
8. topical conference on high-temperature plasma diagnostics, Hyannis, MA (USA), 6-10 May 1990.
Groebner, R.J.; Burrell, K.H.; Gohil, P.; Seraydarian, R.P.
Funding Information
AC03-89ER51114
View MARC record | catkey: 14748619