Helium transport and exhaust studies of H-mode discharges in the DIII-D tokamak [electronic resource]
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| Online Access: |
Online Access |
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1993.
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| Subjects: |
| Abstract: | A collaborative program has been initiated to measure helium (He) transport and exhaust on DIII-D in L-mode, ELM-free H-mode, and ELMing H-mode. These diverted plasmas operating in enhanced confinement regimes should provide valuable information for the International Thermonuclear Experimental Reactor (ITER). To simulate the presence of He ash in DIII-D, a 50 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of ∼ 15%. The time dependence of the He density profiles in the plasma core is measured with charge-exchange recombination spectroscopy and the He spatial distribution on the diverter floor is studied with an impurity monitor array. The dependence of core transport diffusivities as a function of ELM frequency have been studied and the first demonstration made of He exhaust from an H-mode plasma in a diverted tokamak. The exhaust rate of He from these ELMing H-mode plasmas appears to be within the acceptable range for a fusion reactor, like ITER, based on a measured value of τ*{sub He}/τE ≈14. |
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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 12/31/1993. "conf-9311147--1" "DE94004744" "35AT10020/AT0520210" IAEA meeting on H-mode physics,Naka (Japan),15-17 Nov 1993. Wade, M.R.; Hogan, J.T.; Hillis, D.L. |
| Physical Description: | 6 p. : digital, PDF file. |