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Free keywords:
General Relativity and Quantum Cosmology, gr-qc, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Physics, Instrumentation and Detectors, physics.ins-det
Abstract:
Major construction and initial-phase operation of a second-generation
gravitational-wave detector KAGRA has been completed. The entire 3-km detector
is installed underground in a mine in order to be isolated from background
seismic vibrations on the surface. This allows us to achieve a good sensitivity
at low frequencies and high stability of the detector. Bare-bones equipment for
the interferometer operation has been installed and the first test run was
accomplished in March and April of 2016 with a rather simple configuration. The
initial configuration of KAGRA is named {\it iKAGRA}. In this paper, we
summarize the construction of KAGRA, including the study of the advantages and
challenges of building an underground detector and the operation of the iKAGRA
interferometer together with the geophysics interferometer that has been
constructed in the same tunnel.