Industrially acceptable methods of plasma ion implantadn not only require an efficient means of switching the negative highvoltage pu1ses.l but also require an energy efficient plasma generation system. To do this, a non-magnetized microwave generated plasma was designed and is being built. Pictured below is the block diagram. The power source is from a Model PPS-2.5 AS ,2500-W. 2.45 GHz Varian (Eimac) microwave power pack with a WR-340 waveguide port. Both the forward and reflected power is measured with a Model EW3-DPM3S Varian power meter. A Model EW3-HH Varian HH tuner (power matching device) is included for impedance matching. Next, a Model GS315 Gerling RMS step transistion. which steps WR-340 (S band) waveguide to WR-284 waveguide, is included since there are many more microwave components available in the WR-284 size. Next, a standard EH tuner is included which is used for most of the matching since the plasma is a changing load. Then. an isolator is included to

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The turbo-pump and turbine are driven by liquid fuel fed into a gas generator, where the fuel is oxidized with a liquid oxidizing agent. For stable operation of the turbine, the combustion temperature of the gas generator must be maintained below 1000 K. The thermodynamic characteristics of kerosene oxidation in the gas generator must be understood to optimize the design and operation conditions of the liquid-fueled rocket engine system. Herein, the 3-species surrogate mixture model for kerosene was selected, and the detailed Dagaut's kerosene oxidation mechanism consisting of 225 chemical species and 1800 reversible chemical reactions was utilized. The exit gas temperature and product gas composition in the gas generator under fuel-rich conditions were simulated by applying the perfectly stirred reactor model. The perfectly stirred reactor model was used in combination with the liquid spray model for evaporation of the droplets and the two-temperature model for evaluation of the flame temperature separately from the locally averaged reactor temperature. The theoretical prediction of the gas species fraction and soot yield could be improved by applying the tar cracking mechanism, where the reaction characteristics under high temperature were taken into account.

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