ASTROD的模拟I试验由太阳高能粒子引起的质量充电
Simulation of ASTROD I test mass charging due to solar energetic particles
摘要：
当ASTROD I在太空中飞行时，由于银河系宇宙射线和太阳高能粒子入射到航天器上，其测试质量将积累电荷。该试验质量电荷将在试验质量和周围电极之间产生库仑力。在早期使用GEANT 4工具包的工作中，我们预测在太阳最大值时，宇宙射线质子的净充电率在0.1到1000 GeV之间接近9.0 +e/s，在太阳最小值时上升到26.5 +e/s。在这里，我们使用GEANT 4模拟充电过程中，由于太阳高能粒子事件，并估计由于这种充电的加速度噪声的大小。预测充电率范围从2840至64300 +e/s，在峰值强度，4个最大的SEP事件在1989年9月和10月。对于2个较大的事件，充电引起的加速度干扰超过ASTROD I加速度噪声预算要求。为了抑制这种充电噪声，应考虑连续放电。在2个小事件期间的加速噪声远低于设计目标，尽管在这些事件期间，净充电率将由这些太阳通量主导。
英文摘要：
As ASTROD I travels through space, its test mass will accrue charge due to galactic cosmic-rays and solar energetic particles incident on the spacecraft. This test mass charge will result in Coulomb forces between the test mass and the surrounding electrodes. In earlier work using the GEANT4 toolkit, we predicted a net charging rate of nearly 9.0 +e/s from cosmic-ray protons between 0.1 and 1000 GeV at solar maximum, and rising to 26.5 +e/s at solar minimum. Here we use GEANT4 to simulate the charging process due to solar energetic particle events and to estimate the magnitude of acceleration noise due to this charging. The predicted charging rates range from 2840 to 64300 +e/s, at peak intensity, for the 4 largest SEP events in September and October 1989. For the 2 larger events, the acceleration disturbances due to charging exceeds the ASTROD I acceleration noise budget requirement. Continuous discharge should be considered for suppressing this charging noise. The acceleration noise during the 2 small events is well below the design target, although during these events, the net charging rate will be dominated by these solar fluxes.
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