title: Modeling extreme ultraviolet suppression of electrostatic analyzers.
abstract: In addition to analyzing energy-per-charge ratios of incident ions, electrostatic analyzers (ESAs) for spaceborne time-of-flight mass spectrometers must also protect detectors from extreme ultraviolet (EUV) photons from the Sun. The required suppression rate often exceeds 1:10(7) and is generally established in tests upon instrument design and integration. This paper describes a novel technique to model the EUV suppression of ESAs using photon ray tracing integrated into SIMION, the most commonly used ion optics design software for such instruments. The paper compares simulation results with measurements taken from the ESA of the Mass instrument flying onboard the Wind spacecraft. This novel technique enables an active inclusion of EUV suppression requirements in the ESA design process. Furthermore, the simulation results also motivate design rules for such instruments.
authors.affiliation: Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, USA.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Gershman
authors.forename: Thomas H
authors.initials: TH
authors.lastname: Zurbuchen