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- W2079165795 abstract "The accretion of electrostatic charge in the isolated LISA test masses due to energetic particles in the space environment hinders the drag-free operation of the gravitational inertial sensors. Robust predictions of charging rates and associated stochastic fluctuations are therefore required for the exposure scenarios expected throughout the mission. We report on detailed charging simulations with the Geant4 toolkit, using comprehensive geometry and physics models, for galactic cosmic-ray protons and helium nuclei. These predict net charging rates of up to +100 elementary charges per second during the solar minimum period, decreasing by half at solar maximum. Charging from sporadic solar events involving energetic protons was also investigated. Other physical processes hitherto overlooked as potential charging mechanisms have been assessed. Significantly, the kinetic emission of very low-energy secondary electrons due to bombardment of the inertial sensors by primary cosmic rays and their secondaries can produce charging currents comparable with the Monte Carlo rates." @default.
- W2079165795 created "2016-06-24" @default.
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- W2079165795 date "2004-09-29" @default.
- W2079165795 modified "2023-09-23" @default.
- W2079165795 title "New estimates of test-mass charging in the LISA mission" @default.
- W2079165795 doi "https://doi.org/10.1117/12.553195" @default.
- W2079165795 hasPublicationYear "2004" @default.
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