ASTROD I Charging Simulation and Disturbances

ASTROD I Charging Simulation and Disturbances
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ASTROD I 充电模拟和干扰

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发表时间:
2007-04
期刊:
arXiv: Astrophysics
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其他
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Astrod I计划作为一个单一的航天器任务。它将在航天器和地面站之间使用干涉和脉冲测距技术,对描述太阳系的参数进行高精度测量,并以更高的精度测试相对论重力。航天器的核心是测试质量,航天器将使用无阻力控制系统来跟踪测试质量。这项任务在很大程度上依赖于维持测试质量的测地线运动。由于宇宙射线和太阳粒子对测试质量的充电,会干扰它的测地线运动。我们用GEANT4工具包和一个简化的几何模型模拟了充电过程,并估计Astrod I测试质量将以24+/-7e+/S的速率带电,这是由于宇宙射线质子和太阳极小时的阿尔法粒子(3He和4He)所致。我们使用这次模拟的结果来估计最坏情况下与测试质量充电相关的扰动的大小,考虑到模型中的不确定性和微小宇宙线组件的潜在充电贡献。
ASTROD I is planned as a single spacecraft mission. It will use interferometric and pulse ranging techniques between the spacecraft and ground stations, to make high precision measurements of the parameters that describe the solar system, and to test relativistic gravity with improved accuracy. At the heart of the spacecraft is a test mass, which the spacecraft will follow using a drag-free control system. The mission critically depends on maintaining the geodesic motion of the test mass. Charging of the test mass due to cosmic rays and solar particles will disturb its geodesic motion. We have modelled the charging process using the GEANT4 toolkit and a simplified, geometrical model and estimate that the ASTROD I test mass will charge positively, at a rate of 24 +/-7 e+/s, due to cosmic ray protons and alpha particles (3He and 4He) at solar minimum. We have used the results of this simulation to estimate the magnitude of disturbances associated with test mass charging, for the worst-case scenario, taking into account uncertainties in the model and potential charging contributions from minor cosmic-ray components.
DOI: 10.1088/0264-9381/22/10/022
发表时间: 2005-05-21
影响因子: 3.5
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影响因子: 3.5
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通讯作者: Travasso, F