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Impurity control studies using SOL flow in DIII-D [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1998.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
5 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:
Experiments on DIII-D have demonstrated the efficacy of using induced scrape-off-layer (SOL) flow to preferentially enrich impurities in the divertor plasma. This SOL flow is produced through simultaneous deuterium gas injection at the midplane and divertor exhaust. Using this SOL flow, an improvement in enrichment (defined as the ratio of impurity fraction in the divertor to that in the plasma core) has been observed for all impurities in trace-level experiments (i.e., impurity level is non-perturbative), with the degree of improvement increasing with impurity atomic number. In the case of argon, exhaust gas enrichment using a modest SOL flow is as high as 17. Using this induced SOL flow technique and argon injection, radiative ELMing H-mode plasmas have been produced that combine high radiation losses (P{sub rad}/P{sub input} > 70%), low core fuel dilution (Z{sub eff} < 1.9), and good core confinement (τ{sub E} > 1.0 τ{sub E},ITER93H).
Report Numbers:
E 1.99:ga--a23001
E 1.99: conf-981064--
conf-981064--
ga--a23001
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
11/01/1998.
"ga--a23001"
" conf-981064--"
"DE99001957"
17. IAEA fusion energy conference, Yokohama (Japan), 19-24 Oct 1998.
Wade, M.R.; Hogan, J.T.; Isler, R.C.
Funding Information:
AC03-99ER54463
AC05-96OR22464
W-7405-ENG-48
AC04-94AL85000
FG03-95ER54294
View MARC record | catkey: 14742748