Estimation of Newtonian noise from the KAGRA cooling system

KAGRA is the first km-scale gravitational wave detector to be constructed underground and employ cryogenics cool down its test masses. While location provides a quiet site with low seismic noise, cooling infrastructure known generate large mechanical vibrations due cryocooler operation structural resonances of cryostat. As system components are relatively heavy in close proximity masses, oscillation gravity force induced by their vibration, so-called Newtonian could contaminate sensitivity. In this paper, we use results from vibration analysis cryostat estimate noise 1-100 Hz frequency band. Our calculations show that, while does not limit current sensitivity or inspiral range, it will an issue future when improves We conclude that may need implement Wiener filters subtract future.