Accession Number : ADA299660

Title :   Particle-in-Cell and Monte Carlo Modelling of Advanced Plasma Thrusters.

Descriptive Note : Final technical rept. 31 Jul 93-31 Jul 95,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Samanta Roy, Robie I. ; Hastings, Daniel E.

PDF Url : ADA299660

Report Date : 31 JUL 1995

Pagination or Media Count : 258

Abstract : In order to accurately assess the backflow contamination potential of electric propulsion thrusters for spacecraft thruster integration purposes, models of the plumes and backflow are necessary. Both axisymmetric and fully three dimensional models of the plume and backflow contamination from ion thruster plumes are presented. Components included are primary beam ions, neutral propellant efflux thermal propellant ions created mainly by charge-exchange (CEX) collisions between primary beam ions and neutral propellant, non-propellant efflux (NPB) sputtered from thruster components, and neutralizing electrons. The plasma hybrid particle in cell (PlC) technique is applied to both propellant CEX ions and NPE ions produced in the beam and their transport out of the beam to the regions surrounding a model spacecraft. Simulations are performed for both single and dual thruster operation. Results of plume properties and backflow are compared with data and good agreement is found. Scaling relationships for the backflow are. determined, and the levels of NPE deposition are shown to be less than previously thought. In addition, the backflow form multiple thruster operation is found to be non- linear. Electric Propulsion, Ion Thrusters, Spacecraft Contamination.

Descriptors :   *THRUSTERS, *SPACE PROPULSION, *PLASMA ENGINES, THERMAL PROPERTIES, SPACECRAFT, NEUTRALIZATION, MONTE CARLO METHOD, PROPELLANTS, THREE DIMENSIONAL, SCALING FACTOR, HYBRID SYSTEMS, CONTAMINATION, EXHAUST PLUMES, ELECTRIC PROPULSION, MULTIPLE OPERATION, ION SOURCES, BACKFLOW.

Subject Categories : Electric and Ion Propulsion

Distribution Statement : APPROVED FOR PUBLIC RELEASE