MANIFESTATION OF ALFVEN'S HYPOTHESIS OF CRITICAL IONIZATION VELOCITY IN THE PERFORMANCE OF MPD THRUSTERS.

E. Y. Choueiri, A. J. Kelly, R. G. Jahn

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

The role of Alfven's critical ionization velocity in the performance of the self-field MPD thruster has been investigated. The existence of a well defined characteristic velocity can be attributed to an ionization process involving the production of a population of suprathermal electrons by an electrostatic instability. It is shown that for the MPD thruster plasma, suprathermalization of electrons via this electrostatic instability can only happen if ions are initially accelerated to velocities larger than the Alfven critical ionization velocity. When this occurs the mechanism will be initiated and the ions decelerated to velocities near the critical velocity. This mechanism ceases to be limiting when all neutrals are ionized. A model of MPD thruster terminal behavior, incorporating Alfven's hypothesis, is presented.

Original languageEnglish (US)
JournalAIAA Paper
StatePublished - Dec 1 1985

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Fingerprint Dive into the research topics of 'MANIFESTATION OF ALFVEN'S HYPOTHESIS OF CRITICAL IONIZATION VELOCITY IN THE PERFORMANCE OF MPD THRUSTERS.'. Together they form a unique fingerprint.

  • Cite this