Actions for Helium transport and exhaust studies in enhanced confinement regimes in DIII-D [electronic resource].

Email RIS file
Bookmark
Report an Issue

Helium transport and exhaust studies in enhanced confinement regimes in DIII-D [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
29 pages : digital, PDF file
Additional Creators
General Atomic Company, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
A better understanding of helium transport in the plasma core and edge in enhanced confinement regimes is now emerging from recent experimental studies on DIII-D. Overall, the results are encouraging. Significant helium exhaust (τ*{sub He}/τ{sub E} ∼ 11) has been obtained in a diverted, ELMing H-mode plasma simultaneous with a central source of helium. Detailed analysis of the helium profile evolution indicates that the exhaust rate is limited by the exhaust efficiency of the pump (∼5%) and not by the intrinsic helium transport properties of the plasma. Perturbative helium transport studies using gas puffing have shown that D{sub He}/X{sub eff}∼1 in all confinement regimes studied to date (including H-mode and VH-mode). Furthermore, there is no evidence of preferential accumulation of helium in any of these regimes. However, measurements in the core and pumping plenum show a significant dilution of helium as it flows from the plasma core to the pumping plenum. Such dilution could be the limiting factor in the overall removal rate of helium in a reactor system.
Report Numbers
E 1.99:ga-a--21905
E 1.99: conf-941101--7
conf-941101--7
ga-a--21905
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
02/01/1995.
"ga-a--21905"
" conf-941101--7"
"DE95009134"
Meeting of the Division of Plasma Physics of the American Physical Society, Minneapolis, MN (United States), 7-11 Nov 1994.
Wade, M.R.; West, W.P.; Hogan, J.T.; Finkenthal, D.F.; Groebner, R.J.; Burrell, K.H.; Gohil, P.; Mahdavi, M.A.; Maingi, R.; Hillis, D.L.
Funding Information
AC03-89ER51114
W-7405-ENG-48
AC05-84OR21400
AC04-76DP00789
View MARC record | catkey: 14743067