Goryachev Maxim, Campbell William M, Heng Ik Siong, Galliou Serge, Ivanov Eugene N, Tobar Michael E
ARC Centre of Excellence for Engineered Quantum Systems, ARC Centre of Excellence for Dark Matter Particle Physics, Department of Physics, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia.
SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, Scotland G12 8QQ, United Kingdom.
Phys Rev Lett. 2021 Aug 13;127(7):071102. doi: 10.1103/PhysRevLett.127.071102.
This work describes the operation of a high frequency gravitational wave detector based on a cryogenic bulk acoustic wave cavity and reports observation of rare events during 153 days of operation over two separate experimental runs (run 1 and run 2). In both run 1 and run 2, two modes were simultaneously monitored. Across both runs, the third overtone of the fast shear mode (3B) operating at 5.506 MHz was monitored; whereas in run 1, the second mode was chosen to be the fifth overtone of the slow shear mode (5C) operating at 8.392 MHz. However, in run 2, the second mode was selected to be closer in frequency to the first mode; and it was chosen to be the third overtone of the slow shear mode (3C) operating at 4.993 MHz. Two strong events were observed as transients responding to energy deposition within acoustic modes of the cavity. The first event occurred during run 1 on 12 May 2019 (UTC), and it was observed in the 5.506 MHz mode; whereas the second mode at 8.392 MHz observed no event. During run 2, a second event occurred on 27 November 2019 (UTC) and was observed by both modes. Timings of the events were checked against available environmental observations as well as data from other detectors. Various possibilities explaining the origins of the events are discussed.
这项工作描述了一种基于低温体声波腔的高频引力波探测器的运行情况，并报告了在两个独立实验运行（运行1和运行2）的153天运行期间对罕见事件的观测结果。在运行1和运行2中，同时监测了两种模式。在两次运行中，监测了工作频率为5.506MHz的快速剪切模式的第三泛音（3B）；而在运行1中，第二种模式选择为工作频率为8.392MHz的慢速剪切模式的第五泛音（5C）。然而，在运行2中，第二种模式选择为在频率上更接近第一种模式；并选择为工作频率为4.993MHz的慢速剪切模式的第三泛音（3C）。观测到两个强烈事件，表现为对腔内声学模式内能量沉积的瞬态响应。第一个事件发生在2019年5月12日（协调世界时）的运行1期间，在5.506MHz模式中观测到；而在8.392MHz的第二种模式中未观测到事件。在运行2期间，第二个事件发生在2019年11月27日（协调世界时），两种模式均观测到。根据可用的环境观测数据以及来自其他探测器的数据对事件的时间进行了核对。讨论了各种解释事件起源的可能性。
