A r a a t i o n cooled MPD t h r u s t e r was t e s t e d with t h e magnetic f i e l d supplied by a permanent magnet. a t t h e cathode t i p . A t 25 k W arc power t h e maximum magnet temperature w a s 835O K.weight was under 1 kg/kW. The Mm) t h r u s t e r was also t e s t e d with a superconducting magnet t o i n v e s t igate operation a t varying magnetic f i e l d strengths up t o 1 t e s l a . Some increase i n power a a p a b i l i t y was obtained with increasing f i e l d . t h r u s t e r w a s operated with argon propellant and a hollow cathode, arc efficiency was found t o i ncrease with applied magnetic f i e l d strength.
MHD generators a r e uniquely capable of f u l l y ExtenSuch r eexploiting advances i n high-temperature reactor technology for e l e c t r i c power generation. sion of NEFiVA technology could make 2500 IC longl i f e inert-gas-cooled reactors feasible. actors and MHD generators mate i n t o a t t r a c t i v e multi-MW e l e c t r i c power systems f o r e i t h e r Cpace or ground ap@ications.A turbo-MHD system using a turbine driven compressor i s the most a t t r a c t i v e cycle. t o r area and temperature f o r space applications. space-power system with 10 PM e l e c t r i c output, shielded for manned missions, could achieve specif i c m9sses of 3.5 t o 5 kg/kWe. A ground-power stat i o n with 60 percent efficiency a l s o appears f e a s ible.It has high cycle efficiency and l o w radia-A
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