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Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
15 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:
Long pulse and steady state fusion ignition devices will require a significant radiated power fraction to minimize heat flux to, and sputtering of, the first wall. While impurity gases have been proposed to enhance radiation, precise control of impurity gas injection is essential to achieve an adequate radiative power fraction while maintaining good energy confinement and low central impurity concentration. We report here the first experiments in the DIII-D tokamak using feedback control of the rate of impurity gas injection. These experiments were carried out with active divertor pumping using the in-situ DIII-D cryopump. The radiated power fraction was controlled by sensing either UN edge line radiation (Ne{sup +7}) or mantle radiation from selected bolometer channels and using the DIII-D digital plasma control system to calculate radiated power real-time and generate an error signal to control an impurity gas injector valve.
Report Numbers:
E 1.99:ga--a22345
E 1.99: conf-960569--17
conf-960569--17
ga--a22345
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
10/01/1996.
"ga--a22345"
" conf-960569--17"
"DE97003363"
12. international conference on plasma surface interactions in controlled fusion devices, Saint-Raphael (France), 20-26 May 1996.
Allen, S.L.; Jackson, G.L.; Staebler, G.M.
Funding Information:
AC03-89ER51114
AC05-96OR22464
W-7405-ENG-48
View MARC record | catkey: 14743595