由于太空磁场引起的加速噪声,用于日中心重力波探测器
Jia-Hui Peng1, Ji-Xiang Zhang1, W Hong2
1MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics & School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University (Zhuhai Campus), Zhuhai, 519082, People's Republic of China.
Scientific reports
|July 2, 2025
概括
太空磁场为像LISA和TianQin这样的引力波观测站制造加速噪音. 这种噪声在两种情况下都是可比的,并且在可接受的范围内,尽管天需要更严格的参数设计.
科学领域:
- 天体物理学 天体物理学
- 引力波检测引力波探测器
- 太空科学 太空科学
背景情况:
- 太空中的引力波观测仪需要高精度的惯性传感器来检测低频信号 (0.1-100毫赫兹).
- 太空磁场可以在测试质量上诱导磁矩和洛伦兹力,产生临界加速噪声.
- 了解和减轻磁场干扰对于任务成功至关重要.
研究的目的:
- 计算和分析激光干扰仪空间天线 (LISA) 空间磁场引起的加速噪声.
- 为了比较LISA和地心天文台TianQin之间的磁场加速噪声.
- 评估太阳活动周期对磁场噪声的影响,并推导设计参数约束.
主要方法:
- 从OMNI数据集中获取了25年的空间磁场数据 (1998-2022年).
- 对LISA在多个太阳周期内计算的磁场加速噪声的每日振幅光谱密度.
- 对LISA和TianQin的测试质量 (TM) 的比较噪声水平和衍生 χ-ξ参数图.
主要成果:
- 1毫赫兹的LISA磁场加速噪声的中位数大约为1 × 10−17 m s−2 Hz−1/2.2.
- 对于LISA和TianQin的磁场加速噪声是相当大的,并且符合各自的要求.
- 25年来的统计分析显示,天对 χ-ξ 参数的设计要求比 LISA 更为严格.
结论:
- 空间磁场加速噪声是LISA和天津的重要但可以管理的因素.
- 衍生出来的 χ-ξ 参数图为未来引力波任务的测试质量设计和优化提供了必要的指导.
- 长期监测太空磁场对于完善噪声模型和确保引力波探测器的灵敏度至关重要.
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