Bulletin of the American Physical Society
APS April Meeting 2024
Wednesday–Saturday, April 3–6, 2024; Sacramento & Virtual
Session DD02: V: Gravitational Waves
5:30 AM–7:30 AM,
Thursday, April 4, 2024
Room: Virtual Room 02
Sponsoring
Unit:
DGRAV
Chair: Sohan Ghodla, University of Auckland
Abstract: DD02.00006 : Experimental Investigation of Shielding of a Dynamic Gravitational Field*
6:30 AM–6:42 AM
Presenter:
Jürg Dual
(ETH Zurich)
Authors:
Jürg Dual
(ETH Zurich)
Tobias Brack
(ETH Zurich)
Fadoua Balabdaoui
(ETH Zurich)
Stefan Blunier
(ETH Zurich)
Jonas Fankhauser
(ETH Zurich)
Stephan Kaufmann
(ETH Zurich)
Helge C Hille
(ETH Zurich)
Laura De Lorenzis
(ETH Zurich)
Francesco Palmegiano
(ETH Zurich)
Donat Scheiwiller
(ETH Zurich)
Jean-Claude Tomasina
(ETH Zurich)
Pavel Trtik
(PSI)
Bernhard Zybach
(ETH Zurich)
Michael Meyer
(ETH Zürich)
Usually, dynamic experiments consist of a transmitter system, i.e. a periodically moving mass distribution, and a detector system. Two such systems have been described recently (Brack et al., 2022, 2023). In the latter, the transmitter system consists of two rotating tungsten bars. The detector consists of a high Q (104), 42 Hz resonant bending beam of 1m length made of titanium. Its motion is analyzed using three calibrated laser Doppler vibrometers and multichannel lock-in amplifiers. Of paramount importance is the passive and active vibration isolation of the detector from ambient noise and crosstalk from the transmitter. The interaction is quantitatively modelled with high precision and excellent agreement between theory and experiment. The transmitters' homogeneity is characterized using neutron tomography. Here, we present a new feature of the setup, where a ~400kg metal shield (with dimensions 1.4m x 0.25m x d, where d is its thickness) is periodically lowered in between transmitter and detector. Two methods are presented to analyze the signals for the two shield positions (with/without shield): Measuring the frequency response of the detector and fitting a single degree of freedom response function or a continuous near resonance excitation with fixed frequency. Currently an upper bound for the relative change of the response signal of about 10-3 has been established for a brass shield at a frequency of more than four orders of magnitude higher than previous work.
*We acknowledge the generous support of ETH Zurich, Switzerland
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