PLASMA DIAGNOSTIC METHODS FOR IONIZED GAS FLOWS
COLORADO UNIV AT BOULDER
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An investigation has been conducted to elucidate several different methods of diagnostics for ionized gas flows. Particular emphasis was placed on techniques of possible interest to the 50 Megawatt Facility at Wright Field. An analysis was completed which describes the behavior of Langmuir probes in strong magnetic fields. The detailed behavior of the results indicates that the theory is capable of describing, with reasonable quantitative accuracy, the collection properties of Langmuir probes as a function of applied potential and magnetic field strength for all magnetic fields B 0. Thomson scattering measurements of electron density do not appear feasible for the 50 Megawatt Facility. An analysis was made of several types of atomic and molecular flourescence radiation experiments of potential diagnostics use. It is concluded that local specie concentration measurements of NO and O2 can be accomplished using laser flourescence excitation, and that gas velocity measurements can be made using laser excitation of the N2 Lyman-Birge-Hopfield system or the NO beta system and monitoring the trajectory of the excited volume of gas. Additional work completed during contract and described herein is as follows 1 A novel method of pumping energy conversion devices with lasers to achieve enhanced electrical output. 2 A general survey of laser sources for line spectroscopy. 3 A new method of joining porous refractory metals. 4 Laser welding.
- Plasma Physics and Magnetohydrodynamics