Emitter depletion measurement and modeling in the T5&T6 Kaufman-type ion thrusters

Abstract

This paper presents some of the aspects of a program undertaken by Qineti Q to characterize and determine the depletion rates and predict life time of its cathode technology. It reports on a long duration test performed on the T5 (15,000 hours) and a series of shorter tests on the T6 (800hours and 4000hours) including the results of destructive post test examinations and insert depletion measurements. The program also includes a modeling of insert depletion by Southampton University which has currently produced good agreement with measured depletion on the 15,000 hour T5 insert. Two tests have also been carried out on the T6 cathode to determine an end of life condition. An accelerated lifetest where the insert temperature was increased by 20oC has to date accumulated 3790 hours of operation. This is equivalent to 30,320hours with an 8×acceleration factor or 60,640hours assuming a 16× acceleration factor. Another test was also undertaken with two grossly depleted T6 inserts (25% and 50% depleted). Both cathodes although grossly depleted still behaved nominally. All the results give a degree of confidence in the compatibility of the T6 thruster cathode with future high impulse mission lifetime requirements.

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