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首页> 外文会议>Conference on Gravitational-Wave Detection, Aug 23-25, 2002, Waikoloa, Hawaii, USA >Electrostatic modelling for LISA
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Electrostatic modelling for LISA

机译：LISA的静电建模

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摘要

LISA employs a capacitive sensing and positioning system to maintain the drag-free environment of the test masses acting as interferometer mirror elements. The need for detailed electrostatic modelling of the test mass environment arises because any electric field gradient or variation associated with test mass motion can couple the test mass to its housing, and ultimately the spacecraft. Cross-couplings between components in the system can introduce direct couplings between sensing signals, sensing axes and the drive signal. A variation in cross-couplings or asymmetry in the system can introduce capacitance gradients and second derivatives, giving rise to unwanted forces and spring constant modifications. These effects will vary dependent on the precise geometry of the system and will also tend to increase the sensitivity to accumulated charge on the test-mass. Presented are the results of a systematic study of the effect of the principal geometry elements (e.g. machining imperfections, the caging mechanism) on the test mass electrostatic environment, using the finite element code ANSYS. This work is part of an ongoing ESA study into drag-free control for LISA and the LTP on SMART 2 and ultimately aims to eliminate geometries that introduce too large a disturbance and optimise the electrostatic design.
机译：LISA采用电容式感应和定位系统来维持用作干涉仪镜面元件的测试物体的无阻力环境。对测试质量环境进行详细静电建模的需求之所以出现，是因为与测试质量运动相关的任何电场梯度或变化都可​​能将测试质量耦合到其外壳，最终耦合到航天器。系统中组件之间的交叉耦合会在传感信号，传感轴和驱动信号之间引入直接耦合。系统中交叉耦合或非对称性的变化会引入电容梯度和二阶导数，从而引起不必要的作用力和弹簧常数的变化。这些影响将取决于系统的精确几何形状，并且还将倾向于增加对测试质量上累积电荷的敏感性。呈现的是使用有限元代码ANSYS对主要几何元素（例如加工缺陷，保持机制）对测试质量静电环境的影响进行系统研究的结果。这项工作是正在进行的ESA研究的一部分，该研究针对SMART 2上的LISA和LTP的无阻力控制，最终旨在消除造成太大干扰的几何形状并优化静电设计。

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