Numerical simulation of magnetically-guided plasma flows for the design of a fusion propulsion system

Abstract

Numerical simulations of plasma flows through magnetic guide-fields have been conducted to provide critical understanding and detailed design guidance to near-future experimental efforts. The plasma flow is guided by an applied magnetic field arrangement that is sustained by two magnet coils. In the present effort the two magnet-coil sections have been simulated separately. Quasi-steady modeling using helium propellant with classical resistivity demonstrates a nearly-isentropic expansion of the confined plasma through the magnetic-nozzle section, to high exhaust speeds (>270 km/sec). At the inlet of the nozzle—near the plasma-field interface—the development of non-uniformities in the magnetic field is uncovered. For T0=100 eV, as much as 50% of the mass flux penetrates the current-layer across the magnetic field lines. Preliminary simulations of hypersonic plasma flow (M=8.8) through the magnetic-diffuser section, display characteristic wave patterns as a result of shock and expansion wave reflections fro...