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arXiv · 2006.08970

Prospects for improving the sensitivity of the cryogenic gravitational wave detector KAGRA

Yuta Michimura·Kentaro Komori·Yutaro Enomoto·Koji Nagano·Atsushi Nishizawa·Eiichi Hirose·Matteo Leonardi·Eleonora Capocasa·Naoki Aritomi·Yuhang Zhao·Raffaele Flaminio·Takafumi Ushiba·Tomohiro Yamada·Li-Wei Wei·Hiroki Takeda·Satoshi Tanioka·Masaki Ando·Kazuhiro Yamamoto·Kazuhiro Hayama·Sadakazu Haino·Kentaro Somiya
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Abstract

Upgrades to improve the sensitivity of gravitational wave detectors enable more frequent detections and more precise source parameter estimation. Unlike other advanced interferometric detectors such as Advanced LIGO and Advanced Virgo, KAGRA requires different approach for the upgrade since it is the only detector which employs cryogenic cooling of the test masses. In this paper, we describe possible KAGRA upgrades with technologies focusing on different detector bands, and compare the impacts on the detection of compact binary coalescences. We show that either fivefold improvement in the $100 M_{\odot}$--$100 M_{\odot}$ binary black hole range, a factor of 1.3 improvement in the binary neutron star range, or a factor of 1.7 improvement in the sky localization of binary neutron stars is well feasible with upgrades that do not require changes in the existing cryogenic or vacuum infrastructure. We also show that twofold broadband sensitivity improvement is possible by applying multiple upgrades to the detector.

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Yuta Michimura, Kentaro Komori, Yutaro Enomoto, Koji Nagano, Atsushi Nishizawa, Eiichi Hirose, Matteo Leonardi, Eleonora Capocasa, Naoki Aritomi, Yuhang Zhao, Raffaele Flaminio, Takafumi Ushiba, Tomohiro Yamada, Li-Wei Wei, Hiroki Takeda, Satoshi Tanioka, Masaki Ando, Kazuhiro Yamamoto, Kazuhiro Hayama, Sadakazu Haino, Kentaro Somiya. 2020-06-16. Prospects for improving the sensitivity of the cryogenic gravitational wave detector KAGRA. https://doi.org/10.1103/physrevd.102.022008

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