V. V. Frolov

TL;DR: Improved versions of the Input Optics for Enhanced LIGO, an incremental upgrade to the Initial LigO interferometers, designed to run with 30 W input power demonstrated improved performance including better optical isolation, less thermal drift, minimal thermal lensing, and higher optical efficiency.

Abstract: We report the results of the first joint observation of the KAGRA detector with GEO 600. GEO 600 and KAGRA performed a joint observing run from April 7 to 20, 2020. We present the results of the joint analysis of the GEO–KAGRA data for transient gravitational-wave signals, including the coalescence of neutron-star binaries and generic unmodeled transients. We also perform dedicated searches for binary coalescence signals and generic transients associated with gamma-ray burst events observed during the joint run. No gravitational-wave events were identified. We evaluate the minimum detectable amplitude for various types of transient signals and the spacetime volume for which the network is sensitive to binary neutron-star coalescences. We also place lower limits on the distances to the gamma-ray bursts analysed based on the non-detection of an associated gravitational-wave signal for several signal models, including binary coalescences. These analyses demonstrate the feasibility and utility of KAGRA as a member of the global gravitational-wave detector network.

TL;DR: In this paper, a new global control scheme, EQ mode, consisting of an automated sequence of optimized control filters that reduces and coordinates the motion of the seismic isolation platforms during earthquakes, was proposed.

TL;DR: In this paper, the LIGO Input Optics subsystem was designed and implemented for the sixth science run of the LigO interferometers and demonstrated improved performance including better optical isolation, less thermal drift, minimal thermal lensing and higher optical efficiency.

TL;DR: Using 12.7 fb(-1) of data collected with the CLEO detector at CESR, two-photon production of the cc states chi(c0) and chi( c2) in their decay to pi(+)pi(-)pi(+) Pi(-) is observed.