Vacuum ultraviolet spectra of uranium hexafluoride/argon mixtures

The transmission properties of room temperature helium at pressures up to 20 atmospheres were determined in the wavelength range from 80 to 300 nm. Similarly, the transmission properties of uranium hexafluoride at 393 K (pressures less than 1.0 mm) were determined in the wavelength range from 80 to about 120 nm. The results show that high pressure helium is sufficiently transparent in the vacuum ultraviolet region (provided trace contaminants are removed) to be utilized as a transparent purge gas in future fissioning gaseous uranium plasma reactor experiments. Absorption cross sections for uranium hexafluoride were calculated from the data between 80 and 120 nm and were of the order of 10 to the -17 power sq cm

The spectral properties of uranium hexafluoride and its thermal decomposition products

This investigation was initiated to provide basic spectral data for gases of interest to the plasma core reactor concept. The attenuation of vacuum ultraviolet (VUV) radiation by helium at pressures up to 20 atm over path lengths of about 61 cm and in the approximate wavelength range between 80 and 300 nm was studied. Measurements were also conducted to provide basic VUV data with respect to UF6 and UF6/argon mixtures in the wavelength range between 80 and 120 nm. Finally, an investigation was initiated to provide basic spectral emission and absorption data for UF6 and possible thermal decomposition products of UF6 at elevated temperatures

Theoretical investigation of radiant heat transfer in the fuel region of a gaseous nuclear rocket engine

Effect of fuel opacity on temperature distribution in gaseous nuclear rocket engin

Experimental refractive indices and theoretical small-particle spectral properties of selected metals

Absorption, scattering, and extinction parameters of small spherical metal particles used as seeding agents to control radiant heat transfer in gaseous nuclear rocket engine

Spectral absorption coefficients of helium and neon buffer gases and nitric oxide-oxygen seed gas mixture

Spectral absorption coefficients of helium, neon, and nitric oxide mixtures with oxygen as functions of pressure, temperature, and wave numbe

Theoretical investigation of the radiant emission spectrum from the fuel region of a nuclear light bulb engine

Spectral emission characteristics of fuel region of nuclear light bulb engin

Solar sustained plasma/absorber conceptual design

A space power system concept was evaluated which uses concentrated solar energy to heat a working fluid to temperatures as high as 4000 K. The high temperature working fluid could be used for efficient electric power production in advanced thermal or magnetohydrodynamic conversion cycles. Energy absorber configurations utilizing particles or cesium vapor absorber material were investigaed. Results of detailed radiant heat transfer calculations indicated approximately 86 percent of the incident solar energy could be absorbed within a 12-cm-dia flowing stream of gas borne carbon particles. Calculated total energy absorption in the cesium vapor seeded absorber configuration ranged from 34 percent to 64 percent of the incident solar energy. Solar flux concentration ratios of between approximately 3000 and 10,000 will be required to sustain absorber temperatures in the range from 3000 K to 4000 K

Theoretical investigation of the absorption and scattering characteristics of small particles

Absorption, scattering, and extinction characteristics of small solid spherical particles used as seeding agents in gaseous nuclear rocket engine

Theoretical investigation of the absorptive properties of small particles and heavy-atom gases

Absorption properties of small particles and heavy-atom gases for use in nuclear rocket engine

Theoretical investigation of the composition and line emission characteristics of argon-tungsten and argon-uranium plasmas

Composition and line emission characteristics of ionized tungsten, uranium, and argo