For Microwave Rocket launch, long distance transmission technology of a millimeter‐wave beam is important because the beam is irradiated from ground‐base to the vehicle leaving toward the space. A small aperture leads a large beam divergence and the power density decreased with the altitude. In this study, a 10m beam transmission system was designed with quasi‐optical technology and tested for a sliding thruster. A beam expander composed of a couple of offset parabolic mirrors was applied on the beam transmitter, and the beam narrowed on the vehicle to provide enough power to propel the vehicle. A pulse energy of 400J (400kW and 1ms) was injected to the thruster at the repetition rate of 100Hz for 2s using a 170GHz gyrotron. The position of the thruster set on the horizontal sliding guide was measured using a laser displacement meter. The thrust estimated from the position data showed almost constant thrust for each distance, which shows this quasi‐optical design method is feasible enough to construct a launch demonstration system for Microwave Rocket.


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    Title :

    Millimeter‐wave Beam Conversion with Quasi‐optical Mirrors for Microwave Rocket Launch Demonstration



    Conference:

    BEAMED ENERGY PROPULSION: Seventh International Symposium ; 2011 ; Ludwigsburg, (Germany)


    Published in:

    AIP Conference Proceedings ; 1402 , 1 ; 467-477


    Publication date :

    2011-11-10


    Size :

    11 pages





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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