The effects of exchange gas temperature and pressure on the beta-layering process in solid deuterium-tritium fusion fuel [electronic resource].
- 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
- Restrictions on Access:
- Free-to-read Unrestricted online access
- 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
- Other Subject(s):
- Thermonuclear Fuels
- Temperature Effects
- Beta Decay
- Boundary Layers
- Pressure Effects
- Thermal Conductivity
- Beta Decay Radioisotopes
- Beta-Minus Decay Radioisotopes
- Hydrogen Isotopes
- Light Nuclei
- Nuclear Decay
- Odd-Even Nuclei
- Odd-Odd Nuclei
- Physical Properties
- Stable Isotopes
- Thermodynamic Properties
- Years Living Radioisotopes
- Published through SciTech Connect.
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:
View MARC record | catkey: 14749102