Simulation of ASTROD I test mass charging due to interplanetary electrons and heavy nuclei

Details Simulation of ASTROD I test mass charging due to interplanetary electrons and heavy nuclei Simulation of ASTROD I test mass charging due to interplanetary electrons and heavy nuclei

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009acasn..50...98l&link_type=abstract

Acta Astronomica Sinica, vol. 50, no. 1, p.98-106

Astronomy and Astrophysics

Astronomy

Techniques: Miscellaneous, Relativity, Astrometry, Interplanetary

Scientific paper

In deep space laser ranging missions for gravitational-wave astronomy, astrodynamics and test of relativity, like LISA, ASTROD I and ASTROD, charging of drag-free test mass due to exposure of the spacecraft to various energetic particles in the space environment can affect the quality of the science data due to spurious Coulomb and Lorentz forces. In earlier work, the GEANT4 toolkit has been used to simulate the charging of test mass due to protons and He nuclei of primary cosmic rays, and due to four solar energetic particle events. Here the energy spectra of interplanetary electrons and major nuclear species have been parametrized, and the charging rates due to electrons and heavy nuclei C, N and O have been simulated. Interplanetary electrons are mainly Jovian in origin with a Galactic component. Interplanetary heavy nuclei are Galactic cosmic rays in origin. Charging rate of the ASTROD I test mass from interplanetary electrons contribute about -9% that of the interplanetary protons at solar activity minimum, and over -28% at maximum. Interplanetary heavy nuclei are responsible for ˜ 83% and ˜ 1.64% charging rates of interplanetary protons at solar activity minimum and at maximum respectively.

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