Directions for arcjet technology development

Guidelines for improvements in arcjet performance based on a simplified analysis of advanced mission requirements are presented. The results of this analysis clearly show that to remain competitive with next-generation electric propulsion devices, significant increases in the specific impulse of the present arcjet technology must be achieved. Of the various design options available, concepts that improve the thrust efficiency offer the greatest performance leverage, and may, in fact, represent the only approaches capable of meeting the advanced mission goals. If they are to be successful, such concepts will improve the management of energy and mass transport within the arcjet. One method to understand and control the internal plasmadynamics of the arcjet to improve its performance is outlined. (Author)