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The effects of exchange gas temperature and pressure on the beta-layering process in solid deuterium-tritium fusion fuel [electronic resource].

Published:
Washington, D.C : United States. Dept. of Energy. Office of the Assistant Secretary for Defense Programs, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: (3 pages) : digital, PDF file
Additional Creators:
Los Alamos National Laboratory, United States. Department of Energy. Office of the Assistant Secretary for Defense Programs, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
It has recently been shown that when solid tritium is confined in an isothermal enclosure, self-heating due to beta decay drives a net sublimation of material from thick, warmer layers to thin, cooler ones, ultimately resulting in layer thickness uniformity. We have observed this process of beta-layering'' in a 50--50 D-T mixture in both cylindrical and spherical enclosures at temperatures from 19.6 K, down to 11.6 K. The measured time constants are found to depend on the ³He content as suggested by recent theoretical predictions. When using an enclosure having low thermal conductivity, the ultimate layer uniformity is found to be a strong function of the exchange gas pressure. This is due to the presence of thermal convection in the exchange gas and consequent temperature anisotropy at the solid layer surface. 6 refs., 2 figs., 1 tab.
Report Numbers:
E 1.99:la-ur-90-850
E 1.99: conf-900806--4
conf-900806--4
la-ur-90-850
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Note:
Published through SciTech Connect.
01/01/1990.
"la-ur-90-850"
" conf-900806--4"
"DE90009015"
19. international conference on low temperature physics, Brighton (UK), 16-22 Aug 1990.
Simpson, J.D.; Hoffer, J.K.; Foreman, L.R.; Pattinson, T.R.
Funding Information:
W-7405-ENG-36
View MARC record | catkey: 14749102