Ion thrusters are low thrust, high specific impulse devices with typical operational lifetimes of 10,000 to 30,000 hr over a range of throttling conditions. The NEXT ion thruster is the latest generation of ion thrusters under development. The NEXT ion thruster currently has a qualification level propellant throughput requirement of 450 kg of xenon, which corresponds to roughly 22,000 hr of operation at the highest input power throttling point. This paper will provide a brief review the previous life assessment predictions for various throttling conditions. A further assessment will be presented examining the anticipated accelerator grid hole wall erosion and related electron backstreaming limit. The continued assessment of the NEXT ion thruster indicates that the first failure mode across the throttling range is expected to be in excess of 36,000 hr of operation from charge exchange induced groove erosion. It is at this duration that the groove is predicted to penetrate the accelerator grid possibly resulting in structural failure. Based on these lifetime and mission assessments, a throttling approach is presented for the Long Duration Test to demonstrate NEXT thruster lifetime and validate modeling.


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    Titel :

    Application of the NEXT Ion Thruster Lifetime Assessment to Thruster Throttling


    Beteiligte:
    J. L. VanNoord (Autor:in) / D. A. Herman (Autor:in)

    Erscheinungsdatum :

    2010


    Format / Umfang :

    22 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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    Expanded Throttling Capabilities of the NEXT Thruster

    Patterson, Michael J. / Soulas, George C. / Young, Jason et al. | AIAA | 2013


    Lifetime Assessment of the NEXT Ion Thruster

    Van Noord, Jonathan | AIAA | 2007


    Power throttling the NSTAR ion thruster

    Rawlin, Vincent | AIAA | 1995