The ASTROD I charging simulation and disturbances due to solar energetic particles at 0.5 AU |
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| Institution: | 1. School of Astronautics, Northwestern Polytechnical University, 127 West Youyi Road, Beilin District, Xi''an, 710072, PR China;2. National Key Laboratory of Aerospace Flight Dynamics, Northwestern Polytechnical University, 127 West Youyi Road, Beilin District, Xi''an, 710072, PR China;1. MUL2 group, Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. Department of Mechanical Engineering, College of Engineering, Prince Mohammad Bin Fahd University, P.O. Box 1664, Al Khobar 31952, Saudi Arabia;1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing, 210016, China;2. Department of Earth and Space Science and Engineering, York University, 4700, Keele Street, Toronto, M3J 1P3, Canada;1. National Key Laboratory of Aerospace Flight Dynamics, PR China;2. School of Astronautics, Northwestern Polytechnical University, Xi''an, 710072, PR China;3. Department of Mechanical Engineering, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada |
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| Abstract: | The electrostatic charging of ASTROD I test mass (the Astrodynamical Space Test of Relativity using Optical Devices I) will disturb its pure geodesic motion due to spurious Coulomb and Lorentz forces. The three main disturbances associated with the charging are the acceleration noise of the test mass, the coupling between the test mass and the spacecraft, the appearance of unwanted coherent Fourier components in the measurement bandwidth. By implementing the same geometry and physics models in our previous work, a positive charging rate of 9369 e+/s for the solar energetic particles (SEPs) event on October 19th 1989 is predicted. Based on these charging rates, we calculated the acceleration noise and stiffness associated with charging. We also compared the acceleration noises arising from Coulomb and Lorentz effects using different discharge characteristics. Although the noise due to charging exceeds the ASTROD I budget for the two events at 0.5 AU, it can be suppressed through continuous discharging. In addition to Monte Carlo uncertainty, an error of ±30% in the net charging rates was added to account for uncertainties in the primaries spectra, physics and geometry models. |
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