Improving the absolute accuracy of the gravitational wave detectors by combining the photon pressure and gravity field calibrators
Improving the absolute accuracy of the gravitational wave detectors by combining the photon pressure and gravity field calibrators
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DOI：
10.1103/physrevd.98.022005
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发表时间：
2018-04
影响因子：
5
通讯作者：
Y. Inoue;S. Haino;N. Kanda;Y. Ogawa;Toshikazu Suzuki;T. Tomaru;Takahiro Yamamoto;T. Yokozawa
中科院分区：
文献类型：
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作者：
Y. Inoue;S. Haino;N. Kanda;Y. Ogawa;Toshikazu Suzuki;T. Tomaru;Takahiro Yamamoto;T. Yokozawa
随着源统计数量的增加，在即将到来的观测运行中，引力波源估计参数的绝对精度将从根本上受到探测器校准不确定性的限制。到目前为止，光子校准器是绝对校准测试质量位移的主要工具，依赖于光子压力的测量。由于计量机构维护的激光功率标准的不确定性，目前的技术限制的绝对校准不确定度的引力波振幅被限制在百分之几。为了减少这种不确定性，本文提出了一种结合光子校准器和重力场校准器的新型校准方法。重力场校准器通过产生重力梯度来实现测试质量的位移的调制。在以前的研究中，试验质量和重力场校准器之间距离的不确定性已被证明是系统误差的严重来源。为了抑制这种不确定性，我们提出了一种新的方法，在重力场校准器中使用四极和六极质量分布的组合。我们估计与该方法相关的绝对不确定度低至0.17%，比以前的方法低10倍。
The absolute accuracy of the estimated parameters of gravitational wave sources will be fundamentally limited by the calibration uncertainties of the detectors in upcoming observation runs with the increased number of source statistics. Photon calibrators have so far been the primary tools for the absolute calibration of a test-mass displacement, relying on the measurement of the photon pressure. The current technological limit of the absolute calibration uncertainty for gravitational-wave amplitudes is limited to a few percent, due to the uncertainty in the laser power standard maintained by the metrology institutes. To reduce this uncertainty, this article proposes a novel calibration method that combines a photon calibrator and a gravity field calibrator. The gravity field calibrator achieves modulation of the displacement of the test mass by generating a gravity gradient. In previous studies, uncertainty in the distance between the test mass and the gravity field calibrator has proven a serious source of systematic error. To suppress this uncertainty, we propose a novel method that uses a combination of quadrupole and hexapole mass distributions in the gravity field calibrator. We estimate the absolute uncertainty associated with the method to be as low as 0.17%, which is 10 times less than that of previous methods.