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Title: Numerical simulation of two-grid ion optics using a 3D code
Authors: Anderson, John R.
Katz, Ira
Goebel, Dan
Keywords: ion optics
simulation codes
Issue Date: 11-Jul-2004
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004.
Citation: 40th AIAA Joint Propulsion Conference, Fort Lauderdale, Florida, July 12-14, 2004
Abstract: A three-dimensional ion optics code has been developed under NASA’s Project Prometheus to model two grid ion optics systems. The code computes the flow of positive ions from the discharge chamber through the ion optics and into the beam downstream of the thruster. The rate at which beam ions interact with background neutral gas to form charge exchange ions is also computed. Charge exchange ion trajectories are computed to determine where they strike the ion optics grid surfaces and to determine the extent of sputter erosion they cause. The code has been used to compute predictions of the erosion pattern and wear rate on the NSTAR ion optics system; the code predicts the shape of the eroded pattern but overestimates the initial wear rate by about 50%. An example of use of the code to estimate the NEXIS thruster accelerator grid life is also presented.
Appears in Collections:JPL TRS 1992+

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