A statistical performance model for Hall effect thrusters is presented, which could be used both for predicting off-design performance of the existing thrusters or to obtain the preliminary characteristics (size, power level) of a new thruster with a specified performance. The statistical model is based on a large database of experimental data from the literature and Alta's own test and development activities. The predictive capabilities of the performance model are tested considering two recent Hall thrusters designed by Alta, the XHT-5 prototype operating at 5 kW and the HT-100 thrusters with a nominal operating power of 100 W.
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