Author:
Polk James,Chaplin Vernon,Anderson John,Yim John,Soulas George,Williams George,Shastry Rohit
Abstract
AbstractNASA’s Evolutionary Xenon Thruster (NEXT) is a candidate for future deep space missions that offers high efficiency and specific impulse over a large power throttling range. One of the key life-limiting components is the ion accelerator system, which is subject to sputter erosion by low energy discharge plasma ions incident on the upstream screen grid and higher energy charge exchange ions that impact the downstream accelerator grid. The grid erosion codes CEX2D and CEX3D were validated with data from tests of NEXT as well as the NSTAR ion thruster and then used to assess the time to failure in space due to screen grid erosion and electron backstreaming caused by accelerator grid aperture erosion. Screen grid erosion was found to be important only at the lowest throttle levels, and was conservatively estimated to lead to failure after processing over 900 kg of xenon. The first failure mode at high power levels was found to be electron backstreaming due to accelerator grid hole wall erosion, which would occur after processing over 700 kg of propellant.
Funder
Jet Propulsion Laboratory
Glenn Research Center
Publisher
Springer Science and Business Media LLC
Reference53 articles.
1. Herman DA (2009) NEXT Long-Duration Test Neutralizer Performance and Erosion Characteristics. Paper IEPC-2009-154, presented at the 31st International Electric Propulsion Conference, Ann Arbor, Michigan, 20–24 September, 2009
2. Shastry R, Soulas G, Aulisio M, Schmidt G (2017) Current Status of NASA’s NEXT-C Ion Propulsion System Development Project. Paper IAC-17.C4.4.3, presented at the 68th International Astronautical Congress, Adelaide, Australia, 25–29 September 2017. https://ntrs.nasa.gov/citations/20180001491
3. Brophy J, Polk J, Randolph T (2008) Lifetime Qualification Standards for Electric Thrusters for Deep-Space Missions. Paper AIAA-2008-5184, presented at the 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Hartford, Connecticut, 21–23 July, 2008. https://doi.org/10.2514/6.2008-5184
4. Dankanich JW, Brophy JR, Polk JE (2009) Lifetime Qualification Standard for Electric Thrusters. Paper AIAA 2009-5095, presented at the 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Denver, Colorado, 2–5 August, 2009. https://doi.org/10.2514/6.2009-5095
5. Chaplin VH, Polk JE, Katz I, Anderson JR, Williams GJ, Soulas GC, Yim JT (2018) 3d simulations of ion thruster accelerator grid erosion accounting for charge exchange ion space charge. Paper AIAA-2018-4812 presented at the 54th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Cincinnati, Ohio, 9–11 July, 2018. https://doi.org/10.2514/6.2018-4812
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