Statistics – Computation
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.833r&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Statistics
Computation
Scientific paper
In the last years a trend to use electric propulsion systems on different types of spacecraft is observed. It allows increasing the payload weight, spacecraft functioning duration and flight control system efficiency. Plasma thrusters are of special interest, because many problems concerning its work and efficiency are not solved yet. This work includes experimental and theoretical investigations of plasma thruster operation. In particular, experimental measurements of plasma parameters in acceleration channel of this thruster were carried out. Plasma potential, electron temperature and number density were measured using electrostatic probes. These investigations helped to understand some features of processes, which influence discharge forming and plasma acceleration and also gave important information for comparison with computational modeling results. In spite of the fact that many works about investigation of oscillations in plasma thrusters were conducted, up to present time there is no clear understanding about the role which these oscillations play in thruster work and about their influence on thruster characteristics. Necessity of this work was stipulated by need to describe processes of oscillations origin and evolution in connection with particular thruster parameters: thrust, discharge current etc. Experimental investigations of thruster parameters dependence on different types of oscillations and their intensity were carried out. Theoretical investigations of plasma thrusters were also carried out. Single Larmore radius model and one dimensional ionization diffusion stationary model of accelerating sheath were analyzed. The computational results which was obtained from the latter model correspond satisfactory to experimental data and allow to understand the character of processes in the acceleration channel plasma. At present two-dimensional models of processes in acceleration channel are analyzed which will allow to calculate plasma parameters distribution, corresponding to particular channel configuration and to take into consideration some substantial effects in plasma.
Blinov N. V.
Irishkov S. V.
Rubin V. G.
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