Space-borne gravitational wave detection imposes a demanding requirement on the sensitivity of the laser interferometer. Among all disturbances that affect the measurement accuracy of the laser interferometer, temperature fluctuations contribute significantly. In this paper, the structure model and the interference path design of Taiji-1 laser interferometer have been used to conduct a preliminary simulation analysis of the temperature fluctuation noise through the finite element method. The temperature, the displacement and the optical path difference fluctuations have been obtained and theoretically analyzed. The preliminary simulation results are consistent with the theoretical analysis, which shows that the thermal–structural–optical simulation scheme adopted in this paper is reasonable. With the preliminary simulation results and the actual temperature control of Taiji-1 laser interferometer, we estimate that in Taiji-1 laser interferometer system, the temperature fluctuation is below the order of mK, the node displacement is within 100pm, and the interference arm length difference fluctuation amplitude of the laser interferometer is also within 100pm.

中文翻译：

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太极一号激光干涉仪温度波动效应的初步模拟分析

星载引力波探测对激光干涉仪的灵敏度提出了苛刻的要求。在影响激光干涉仪测量精度的所有干扰中，温度波动的影响很大。本文利用太极一号激光干涉仪的结构模型和干涉路径设计，通过有限元方法对温度波动噪声进行了初步仿真分析。得到了温度、位移和光程差波动并进行了理论分析。初步模拟结果与理论分析一致，表明本文采用的热-结构-光学模拟方案是合理的。100pm，激光干涉仪的干涉臂长差波动幅度也在100下午。