LINGRAN-100 - a proposal for developing a laser interferometric gravitational antenna in russiaстатья

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Дата последнего поиска статьи во внешних источниках: 1 августа 2016 г.

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[1] Lingran-100 - a proposal for developing a laser interferometric gravitational antenna in russia / A. S. Chirkin, A. V. Gusev, A. V. Kopaev et al. // Гравитация и космология. — 1999. — Vol. 5, no. 2. — P. 145–154. The goal of the project proposal is the construction of a wideband gravitational detector based on a laser 100-m FPM-interferometer on free masses in deep rock surroundings. The device is aimed at registering bursts of gravitational radiation with an amplitude of the dimensionless metric variations as small as 10−21 in the frequency range 102 − 103 Hz. An auxilliary purpose is to measure low-frequency variations of the Earth gravity gradients bearing information on the internal dynamics of our planet. The place of the project in the worldwide network of gravitational wave experiments (projects LIGO, VIRGO, GEO-600, TAMA-300, etc.) is determined by the marginally sufficient projected sensitivity level to metric variations allowing one to obtain useful astrophysical information. Second, it is a unique possibility of simultaneous observations of a low-frequency gravi-gradient background which provides the conditions for solving fundamental geodynamical problems. In this sense the project may be considered as a step toward registration of low-frequency gravitational waves with the Earth’s core as a gravitational detector. A deep under-rock position of the installation inside the tunnels of Baksan Neutrino Observatory provides a two-order of magnitude decrease in the geophysical noise level which allows the combination of parallel astrophysical andgeoph ysical studies. This also permits one to increase the interferometer’s effective arm lengths up to 100 km by setting the number of reflections 103 with a 100-m physical base of the device and thereby to bring the sensitivity nearer to an astrophysically interesting level. The long-base interferometer with hanging mirrors also presents a new type of geophysical instrument — an angular gravity gradiometer at low frequencies 10−4 − 10−5 Hz with a resolution of 10−8 − 10−10 rad, which is enough for detecting weak geodynamical perturbations due to oscillations of the Earth interiors. Thus a successful realization of the project would lead to creating an absolutely novel device for studying fundamental problems of geophysics and astrophysics.

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