The VASIMR(TM) VX-100 Engine: Next Step to High Power Electric Propulsion

Abstract

[Abstract] The Variable Specific Impulse Magnetoplasma Rocket ( VASIMR™ ) is a high power magnetoplasm a rocket, capable of Isp/thrust modulation at constant power. The plasma is produced by a helicon discharge. The bulk of the energy is added by ion cyclotron resonance heating (ICRH.) Axial momentum is obtained by adiabatic expansion of the plasma in a mag netic nozzle. Thrust/specific impulse ratio control in the VASIMR™ is primarily achieved by the partitioning of the RF power to the helicon and ICRH systems, with the proper adjustment of the propellant flow. Ion dynamics in the exhaust were studied using probes, gridded energy analyzers (RPA’s), microwave interfe rometry and optical techniques. This paper will summarize results from high power ICRH experiments performed on the VX -50 using deuterium, neon and argon plasma during 2006. An overview of the way forward will be touched on briefly, with some emphasis on t he fact that VASIMR™ is now being developed by private enterprise. The new VX -100 machine is described. The results from recent ionization cost and ICRH experiments in the VX -100 are presented.