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    188宝金博页面版: 【精品】Improved Simulation of the Mass Charging for ASTROD I

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    内容提示： arXiv:0707.1930v1 [astro-ph] 13 Jul 2007February 1, 200814:56WSPC/INSTRUCTION FILEws-ijmpdInternational Journal of Modern Physics Dc World Scientific Publishing CompanyImproved Simulation of the Mass Charging for ASTROD IGANG BAO1,2,3, WEI-TOU NI1,3, D. N. A. SHAUL4, H. M. ARAUJO4, LEI LIU1,2, T. J.SUMNER41. Center for Gravitation and Cosmology, Purple Mountain Observatory, Chinese Academy ofSciences, Beijing West Road No.2, Nanjing, 210008, China2. Graduate University of Chinese Academy of Sciences, ...

    文档格式：PDF | 页数：20 | 浏览次数：8 | 上传日期：2015-12-31 22:56:55 | 文档星级：
    arXiv:0707.1930v1 [astro-ph] 13 Jul 2007February 1, 200814:56WSPC/INSTRUCTION FILEws-ijmpdInternational Journal of Modern Physics Dc World Scientific Publishing CompanyImproved Simulation of the Mass Charging for ASTROD IGANG BAO1,2,3, WEI-TOU NI1,3, D. N. A. SHAUL4, H. M. ARAUJO4, LEI LIU1,2, T. J.SUMNER41. Center for Gravitation and Cosmology, Purple Mountain Observatory, Chinese Academy ofSciences, Beijing West Road No.2, Nanjing, 210008, China2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, Chinabgastro@pmo.ac.cn3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100049, China4. Department of Physics, Imperial College London, London, SW7 2BZ, UKReceived Day Month YearRevised Day Month YearCommunicated byThe electrostatic charging of the test mass in ASTROD I (Astrodynamical Space Testof Relativity using Optical Devices I) mission can affect the quality of the science dataas a result of spurious Coulomb and Lorentz forces. To estimate the size of the resultantdisturbances, credible predictions of charging rates and the charging noise are required.Using the GEANT4 software toolkit, we present a detailed Monte Carlo simulation ofthe ASTROD I test mass charging due to exposure of the spacecraft to galactic cosmic-ray (GCR) protons and alpha particles (3He,4He) in the space environment. A positivecharging rate of 33.3 e+/s at solar minimum is obtained. This figure reduces by 50% atsolar maximum. Based on this charging rate and factoring in the contribution of minorcosmic-ray components, we calculate the acceleration noise and stiffness associated withcharging. We conclude that the acceleration noise arising from Coulomb and Lorentzeffects are well below the ASTROD I acceleration noise limit at 0.1 mHz both at solarminimum and maximum. The coherent Fourier components due to charging are investi-gated, it needs to be studied carefully in order to ensure that these do not compromisethe quality of science data in the ASTROD I mission.Keywords: ASTROD I; charging; GEANT4; disturbances.1. IntroductionThe ASTROD I (Astrodynamical Space Test of Relativity using Optical DevicesI) mission concept is a down-scaled version of ASTROD. The main objectives ofASTROD I are: to improve the precision of measurement of solar-system dynam-ics, solar-system constants and ephemeris; to measure the relativistic gravitationaleffects; to test the fundamental laws of space-time more precisely and to improvethe measurement of the rate of change of the gravitational constant with time.1The basic scheme ofthe ASTROD I space mission is to use two-way laser interfer-ometric ranging and laser pulse ranging between a drag-free ASTROD I spacecraftin a solar orbit and deep space laser stations on Earth. The ASTROD I spacecraft1

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