Abstract
Advanced Virgo+ is a major upgrade of the Advanced Virgo gravitational-wave detector aiming to increase sensitivity in terms of binary neutron star (BNS) range by a factor 3–5 in the next few years. In this work, we present an optimization of the mirror transmittances for the second phase of the project (to be implemented for the O5 observation run) using a random walk algorithm implemented with the advGWINC software. In addition to BNS range, a post merger (PM) SNR is also used as a figure of merit to identify configurations that fine-tune the sensitivity curve, as a function of arm-cavity round trip losses.
Highlights
In the last five years since the first detection of a binary black hole merger [1], the Advanced Virgo (AdV) and Advanced LIGO detector network has expanded its contribution to gravitational-wave astronomy
The AdV gravitational wave detector [8], an upgraded version of the Virgo detector [9] situated in Cascina Italy, is a power-recycled, Michelson interferometer (ITF) with Fabry–Perot cavities in each km arm
In light of the necessary mirror replacements in Phase II, the goal of this study was to study an optimization of the input mirror (IM), power recycling mirror (PRM), and signal recycling mirror (SRM) transmittances (TI M, TPR, and TSR, respectively) that fine-tunes the ITF response to astrophysical signals [11]
Summary
In the last five years since the first detection of a binary black hole merger [1], the Advanced Virgo (AdV) and Advanced LIGO detector network has expanded its contribution to gravitational-wave astronomy. After a series of detector upgrades, the network entered its third observation run (O3), beginning in April 2019 and ending in March 2020. The AdV gravitational wave detector [8], an upgraded version of the Virgo detector [9] situated in Cascina Italy, is a power-recycled, Michelson interferometer (ITF) with Fabry–Perot cavities in each km arm. Following the end of O3, AdV will undergo another set of upgrades in two phases (phase I and phase II), before the fourth and fifth observation runs (O4 and O5). These enhancements will take the ITF from AdV to Advanced Virgo+ (AdV+). Each upgrade phase will produce a global reduction in the detector noise as shown in Figure 1 (taken from Figure 1 in [10]), where the O2 and current O3 measured sensitivity (blue and green) will be lowered into the two projected sensitivities (gray for O4 and purple for O5)
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