Improving the robustness of the advanced LIGO detectors to earthquakes
Improving the robustness of the advanced LIGO detectors to earthquakes
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DOI：
10.1088/1361-6382/abbc8c
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发表时间：
2020-07
影响因子：
3.5
通讯作者：
E. Schwartz;A. Pele;J. Warner;B. Lantz;J. Betzwieser;K. Dooley;S. Biscans;M. Coughlin;
中科院分区：
文献类型：
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作者：
E. Schwartz;A. Pele;J. Warner;B. Lantz;J. Betzwieser;K. Dooley;S. Biscans;M. Coughlin;
远距离地震经常会干扰地面引力波探测器的运行，比如先进的LIGO。在这里，我们提出了EQ模式，一种新的全球控制方案，包括一个自动化的优化控制滤波器，减少和协调地震期间的隔震平台的运动序列。这又抑制了干涉仪臂相对于彼此的差动运动，导致频率低于100 mHz的DARM信号的减少。我们的方法大大提高了干涉仪在地震期间保持运行的能力，波束方向的地面速度高达3.9 μm s−1 rms，为两种探测器创造了新的记录。这在高级LIGO探测器管理地震引起的高地面运动能力的地震控制方面树立了一个里程碑，为在其他极端环境条件下进一步稳健运行开辟了道路。
Teleseismic, or distant, earthquakes regularly disrupt the operation of ground–based gravitational wave detectors such as Advanced LIGO. Here, we present EQ mode, a new global control scheme, consisting of an automated sequence of optimized control filters that reduces and coordinates the motion of the seismic isolation platforms during earthquakes. This, in turn, suppresses the differential motion of the interferometer arms with respect to one another, resulting in a reduction of DARM signal at frequencies below 100 mHz. Our method greatly improved the interferometers’ capability to remain operational during earthquakes, with ground velocities up to 3.9 μm s−1 rms in the beam direction, setting a new record for both detectors. This sets a milestone in seismic controls of the Advanced LIGO detectors’ ability to manage high ground motion induced by earthquakes, opening a path for further robust operation in other extreme environmental conditions.