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  • Fusion-Fission Hybrid Pulsed Propulsion System for Improved Space Transportation

    Paper number

    IAC-13,C4,P,64.p1,x16789

    Author

    Mr. Micah Laughmiller, Univeristy of Alabama in Huntsville, United States

    Coauthor

    Dr. Jason Cassibry, Propulsion Research Center, University of Alabama in Huntsville, United States

    Year

    2013

    Abstract
    The purpose of this paper is to give theoretical results (energy yield and impulse) from the simulation of a Fission-Fusion Hybrid Pulsed Propulsion System. This is achieved utilizing a thorium liner to compress magnetized plasma to thermonuclear temperatures. Two of the primary challenges in thermonuclear fusion concepts are the confinement of a plasma at 108 K to 109 K, and neutron activation of the plasma facing components. The other is the short confinement time of plasma, which limits the energy output and increases the mass of the drivers required to produce the very high temperature, high density fusion plasma. In the approach studied here, the thorium liner greatly amplifies the energy yield than what would be created by the fusion core alone. The neutrons produced by the fusion reactions in the plasma react with the surrounding fission liner, undergoing fission and releasing additional energy. Much of the energy is deposited in the liner, and this compresses and heats the inner fusion plasma. The energy feeds back into the fusion plasma, greatly enhancing the energy yield by increasing the confinement time. This propulsion system approach is very promising for deep space exploration due to the reduced travel time from the moderate thrusts of 10’s kN, nearly optimal ISP (~10,000 s), and vehicle specific power of 1 to 10 kW/kg. The criteria for liner properties and target properties are poorly understood. Fission fusion hybrids including material available in the open literature on weapons will be reviewed; fission/fusion power balance diagrams will be developed. The paper will quantify the effect of uranium and thorium fission liners on the system, the thermal management, and the preheating of the fuel to increase efficiency. Results from this study will provide guidance for future work involving 1D, 2D, and 3D simulations. The goal is major breakthroughs will occur as a result of these simulations.
    Abstract document

    IAC-13,C4,P,64.p1,x16789.brief.pdf

    Manuscript document

    (absent)