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KAGRA is an interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu, Japan. One of the key features of KAGRA is the cryogenic mirrors for the 3 km arm cavities. KAGRA plans to begin the operation before the end of 2019. KAGRA plans to join the network observation of global gravitational wave interferometers.

KAGRA is a new gravitational wave detector which aims to begin joint observation with Advanced LIGO and Advanced Virgo from late 2019. Here, we present KAGRA’s possible upgrade plans to improve the sensitivity in the decade ahead. Unlike other state-of-the-art detectors, KAGRA requires different investigations for the upgrade since it is the only detector which employs cryogenic cooling of the test mass mirrors. In this paper, investigations on the upgrade plans which can be realized by changing the input laser power, increasing the mirror mass, and injecting frequency dependent squeezed vacuum are presented. We show how each upgrade affects to the detector frequency bands and also discuss impacts on gravitational-wave science. We then propose an effective progression of upgrades based on technical feasibility and scientific scenarios.