Evaluation of disturbances due to test mass charging for LISA
Evaluation of disturbances due to test mass charging for LISA
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DOI：
10.1088/0264-9381/22/10/022
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发表时间：
2005-05-21
影响因子：
3.5
通讯作者：
Wass, PJ
中科院分区：
文献类型：
--
作者：
Shaul, DNA;Araújo, HM;Wass, PJ
本文讨论电荷积累对丽莎试验质量的影响。由于银河宇宙射线和太阳粒子对航天器的轰击，电荷在孤立的测试物质上积累。由于库仑和洛伦兹相互作用，这将导致测试质量上的力，这将干扰它们的测地线运动。与这种电荷有关的三种主要干扰是试验质量加速噪声的增加、试验质量与航天器之间的耦合以及测量带宽中出现相干傅立叶分量。这些干扰估计使用最新的充电率和噪声预测从GEANT 4的丽莎使命和技术演示使命，丽莎探路者，在不同的时间在太阳周期。库仑干扰评估的基础上详细的三维，静电，有限元模型和子模型的UP传感器。这些结果进行了比较与那些使用习惯的平行板近似计算电容，这些近似的准确性进行评估，为典型的参数设置。充电干扰的大小的变化作为不同的参数被改变，并讨论了这种干扰的管理。
This paper concerns the effects of the build-up of electrical charge on the LISA test masses. Charge accumulates on the isolated test masses due to the bombardment of the spacecraft by galactic cosmic rays and solar particles. This will result in forces on the test masses, due to Coulomb and Lorentz interactions, which will disturb their geodesic motion. The three main disturbances associated with this charge are an increase in the test mass acceleration noise, coupling between the test mass and the spacecraft and the appearance of coherent Fourier components in the measurement bandwidth. These disturbances are estimated using the latest charging rate and noise predictions from GEANT4 for both the LISA mission and the technology demonstration mission, LISA Pathfinder, at different times in the solar cycle. The Coulomb disturbances are evaluated based on a detailed 3D, electrostatic, finite element model and submodels of the UP sensor. These results are compared with those derived using the customary parallel plate approximation to calculate capacitances, and the accuracy of these approximations is assessed for typical parameter settings. The variation of the magnitude of charging disturbances as different parameters are changed, and the management of such disturbances are discussed.