The build-up of electrical charge on the proof masses is an important disturbance for LISA. The charging is due to penetrating particle radiation (primarily protons) from cosmic rays, and from the Sun during solar flares. Estimates of charging rates have been computed using the GEANT Monte Carlo particle-transport code in combination with realistic proton flux models. The consequences of the charging are discussed.
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Jafry et al. (1997) studied this question.
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