Improving the Robustness of the Advanced LIGO Detectors to Earthquakes
Eyal Schwartz, A Pele, J Warner, B Lantz, J Betzwieser, K L Dooley, S Biscans, M Coughlin, N Mukund, R Abbott, C Adams, R X Adhikari, A Ananyeva, S Appert, K Ar… 展开作者
Eyal Schwartz, A Pele, J Warner, B Lantz, J Betzwieser, K L Dooley, S Biscans, M Coughlin, N Mukund, R Abbott, C Adams, R X Adhikari, A Ananyeva, S Appert, K Arai, J S Areeda, Y Asali, S M Aston, C Austin, A M Baer, M Ball, S W Ballmer, S Banagiri, D Barker, L Barsotti, J Bartlett, B K Berger, D Bhattacharjee, G Billingsley, C D Blair, R M Blair, N Bode, P Booker, R Bork, A Bramley, A F Brooks, D D Brown, A Buikema, C Cahillane, K C Cannon, X Chen, A A Ciobanu, F Clara, S J Cooper, K R Corley, S T Countryman, P B Covas, D C Coyne, L E H Datrier, D Davis, C Di Fronzo, J C Driggers, P Dupej, S E Dwyer, A Effler, T Etze, M Evans, T M Evans, J Feicht, A Fernandez-Galiana, P Fritschel, V V Frolov, P Fulda, M Fyffe, J A Giaime, K D Giardina, P Godwin, E Goetz, S Gras, C Gray, R Gray, A C Green, Anchal Gupta, E K Gustafson, R Gustafson, J Hanks, J Hanson, T Hardwick, R K Hasskew, M C Heintze, A F Helmling-Cornell, N A Holland, J D Jones, S Kandhasamy, S Karki, M Kasprzack, K Kawabe, N Kijbunchoo, P J King, J S Kissel, Rahul Kumar, M Landry, B B Lane, M Laxen, Y K Lecoeuche, J Leviton, J Liu, M Lormand, A P Lundgren, R Macas, M MacInnis, D M Macleod, G L Mansell, S M arka, Z M arka, D V Martynov, K Mason, T J Massinger, F Matichard, N Mavalvala1, R McCarthy, D E McClelland, S McCormick, L McCuller, J McIver, T McRae, G Mendell, K Merfeld, E L Merilh, F Meylahn, T Mistry, R Mittleman, G Moreno, C M Mow-Lowry, S Mozzon, A Mullavey, T J N Nelson, P Nguyen, L K Nuttall, J Oberling, Richard J Oram, C Osthelder, D J Ottaway, H Overmier, J R Palamos, W Parker, E Payne, C J Perez, M Pirello, H Radkins, K E Ramirez, J W Richardson, K Riles, N A Robertson, J G Rollins, C L Romel, J H Romie1, M P Ross, K Ryan, T Sadecki, E J Sanchez, L E Sanchez, T R Saravanan, R L Savage, D Schaetzl, R Schnabel, R M S Schofield, D Sellers, T Shaffer, D Sigg, B J J Slagmolen, J R Smith, S Soni, B Sorazu, A P Spencer, K A Strain, L Sun, M J Szczepanczyk, M Thomas, P Thomas, K A Thorne, K Toland, C I Torrie, G Traylor, M Tse, A L Urban, G Vajente, G Valdes, D C Vander-Hyde, P J Veitch, K Venkateswara, G Venugopalan, A D Viets, T Vo, C Vorvick, M Wade, R L Ward, B Weaver, R Weiss, C Whittle, B Willke, C C Wipf, L Xiao, H Yamamoto, Hang Yu, Haocun Yu, L Zhang, M E Zucker, J Zweizig
Teleseismic, or distant, earthquakes regularly disrupt the operation of ground--based gravitational wave detectors such as Advanced LIGO. Here, we present \emph{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\,$μ\mbox{m/s}$ 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.
As part of the Advanced LIGO+ (A+) project we have developed, produced, and characterised sensors and electronics to interrogate new optical suspensions. The central element is a displacement sensor with an integrated electromagnetic actuator known as a BOSEM and its readout and drive electronics required to integrate them into LIGO's control and data system. In this paper we report on improvements to the sensors and testing procedures undertaken to meet enhanced performance requirements set out by the A+ upgrade to the detectors. The best devices reach a noise level of $4.5\times 10^{-11}{\rm…
Gravitational waves from binary black hole and neutron star mergers are being regularly detected. As of 2021, ninety confident gravitational wave detections have been made by the LIGO and Virgo detectors. Work is ongoing to further increase the sensitivity of the detectors for the fourth observing run, including installing some of the A+ upgrades designed to lower the fundamental noise that limits the sensitivity to gravitational waves. In this review, we will overview how the LIGO detectors work, including their optical configuration and lock acquisition procedure, discuss the detectors' fund…
We present a method to search for scalar field ultralight dark matter directly interacting with gravitational-wave interferometers via a modulation of the fine structure constant and the electron mass. This modulation induces an effective strain in solid materials at a frequency determined by the mass of the dark matter particle. We study the prospects for looking for such an effect in the LIGO detectors by using the solid cavity which is nominally used for pre-stabilizing the laser frequency and we project upper limits. We contextualize them with previous limits from GEO600, possible limits f…
Audio-band Coating Thermal Noise Measurement for Advanced LIGO with a Multi-mode Optical Resonator
在现代高精度光学仪器中，例如在引力波探测器或频率基准中，反射涂层中的热致波动可以是限制噪声源。这种噪声称为涂层热噪声，可以通过选择具有低机械损耗的材料来降低。为了进一步降低涂层热噪声，从而提高下一代仪器的灵敏度，有必要对新材料进行研究。提出了一种利用多个厄米-高斯模共谐振的高精细度折叠腔直接测量涂层热噪声的新方法。该方法用于探测频率范围为30-400 Hz的10^-17 m \rtHz量级的表面波动。我们应用这种技术来测量先进LIGO中使用的涂层的热噪声和损耗角。
