Abstract

5 Torr-Xe). Comparison of the cluster and the monolithic thruster performance characteristics for conditions of nearly equal operating pressure shows that for the 5:25 mg=s anode flow rate, the clusterthrustisequaltotheadditionofthetwomonolithicthrustersandtheanodeefficiencyandspecificimpulseare approximately equal to those of the monolithic thruster. An improved backpressure correction technique based on incremental current change was demonstrated to predict thrust changes within 4% to 2%, significantly better than a simple random flux calculation that uses the facility pressure and chamber wall temperature.

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