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- W2095103697 abstract "In several recent papers, we addressed the case of fusion propulsion by focusing on the gasdyna mic mirror (GDM) as a magnetic device in which fusion plasmas are heated to ignition by the reaction products resulting from the “at rest” annihilation of antiprotons in U 238 targets. Unlike terrestrial fusion power systems where large Q (ratio of fusion power to injected power) values are required, only modest Q-values were shown to be adequate for space applications. In this paper, we focus on a bi -modal fusion propulsion system in which Q-values of about unity or less are needed since the GDM will serv e mainly as a neutron source. It is well known that fusion reactions are neutron rich but energy poor, while fission reactions are energy rich but neutron poor. We make use of this fact by considering a system in which the GDM device serves as a fast neu tron source surrounded by a blanket of Th 232 , which we utilize to breed U 233 and simultaneously burn it to produce energy. For a reasonable size blanket and a D -T plasma density, size and temperature, we find that the proposed hybrid system is capable of producing tens of gigawatts of thermal power per centimeter. If we use this power to heat a hydrogen propellant, we find that a seven meter long engine can generate a specific impulse of about 59,000 secon ds at a thrust of about 8 mega -newtons at a propel lant flow rate of about 130 kg/sec. Such a propulsion capability would allow many meaningful space missions to be carried out in relatively short times. Furthermore, such a hybrid system can generate large amounts of electric power for surface power appl ications once destination is reached ." @default.
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- W2095103697 date "2009-08-02" @default.
- W2095103697 modified "2023-10-18" @default.
- W2095103697 title "Fusion-Fission Hybrid Revisited: Potential for Space Applications" @default.
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- W2095103697 doi "https://doi.org/10.2514/6.2009-4869" @default.
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