Plasma noise in TianQin time-delay interferometry
Plasma noise in TianQin time-delay interferometry
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DOI：
10.1103/physrevd.106.082006
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发表时间：
2022-10
影响因子：
5
通讯作者：
Yichao Jing;Lu Zheng;Shu-Cheng Yang;Xuefeng Zhang;Ling‐Feng Lu;Binbin Tang;Wei-jia Su
中科院分区：
文献类型：
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作者：
Yichao Jing;Lu Zheng;Shu-Cheng Yang;Xuefeng Zhang;Ling‐Feng Lu;Binbin Tang;Wei-jia Su
天琴是一项建议的地心天基引力波观测站，它需要时延干涉测量(TDI)来消除激光频率噪声。由于对精度的要求很高，在地球上方105公里处的∼太阳风等离子体环境可能会对卫星之间的激光干涉测量构成一个不可忽略的噪声源，因为带电粒子会扰动沿光路的折射率。本文首先从空间天气模式和数值轨道两个方面对单链路上的等离子体噪声进行了fi估计，并对其时频特性进行了分析。特别是，为了捕捉10−4−1 Hz整个测量频段的等离子体噪声，我们在fiNER空间和时间分辨率上进行了额外的空间天气磁流体动力学模拟，并在高频数据生成中使用了柯尔莫戈罗夫谱。然后，我们评估了第一代和第二代fi第一代和第二代TDI组合的残余等离子体噪声。解析和数值估计都表明，在正常太阳条件下，TDI后的等离子体噪声小于次级噪声要求。此外，由于不同∼臂之间的噪声相关性，与TDI前后的次级噪声相比，TDI对低于−10ff2 Hz的等离子体噪声显示出中等程度的抑制。
TianQin is a proposed geocentric space-based gravitational wave observatory mission, which re-quires time-delay interferometry (TDI) to cancel laser frequency noise. With high demands for precision, solar-wind plasma environment at ∼ 10 5 km above the Earth may constitute a non-negligible noise source to laser interferometric measurements between satellites, as charged particles perturb the refractivity along light paths. In this paper, we first assess the plasma noises along single links from space-weather models and numerical orbits, and analyze the time and frequency domain characteristics. Particularly, to capture the plasma noise in the entire measurement band of 10 − 4 − 1 Hz, we have performed additional space-weather magnetohydrodynamic simulations in finer spatial and temporal resolutions and utilized Kolmogorov spectra in high-frequency data generation. Then we evaluate the residual plasma noises of the first- and second-generation TDI combinations. Both analytical and numerical estimations have shown that under normal solar con-ditions the plasma noise after TDI is less than the secondary noise requirement. Moreover, TDI is shown to exhibit moderate suppression on the plasma noise below ∼ 10 − 2 Hz due to noise correlation between different arms, when compared with the secondary noise before and after TDI.