Measurement of Schumann Resonance at Kamioka

S Atsuta,N Kanda,A Nishizawa,T Uchiyama,K Hayama,Y Saito,K Ono,K Yano,M Uyeshima,K Somiya,A Araya,S Yamaguchi,S Miyoki,T Ogawa,O Miyakawa

doi:10.1088/1742-6596/716/1/012020

Abstract

On the stochastic gravitational-wave search, correlated noise in two or more gravitational-wave detectors can be a serious problem. Schumann resonance is the name of a standing wave of electromagnetic fields, which is one of the correlated noise sources for the second-generation gravitational-wave detectors. We measured the noise levels of the environmental magnetic field both inside and outside the mine of KAGRA site at Kamioka. In this letter, we report the result of the measurement and compare the amplitude of magnetic fields inside and outside the mine to find possible issues or gain of constructing a detector underground.

Highlights

One of the target sources of the second-generation gravitational-wave detectors (Advanced LIGO [1], Advanced Virgo [2], and KAGRA [3]) is the so-called stochastic gravitational-wave background (SGWB)
All the ground-based gravitational-detectors will be exposed to a same Schumann resonance, except KAGRA, located underground, which might be differently affected by this phenomenon
We set the coil sensors both inside and outside the mine with data loggers MTU-5A produced by PHOENIX GEOPHYSICS at each site

Summary

Introduction

One of the target sources of the second-generation gravitational-wave detectors (Advanced LIGO [1], Advanced Virgo [2], and KAGRA [3]) is the so-called stochastic gravitational-wave background (SGWB). Cross-correlating the data sets enables us to distinguish a signal-like noise from real gravitational waves since a noise is mostly local and is uncorrelated between different detectors. All the ground-based gravitational-detectors will be exposed to a same Schumann resonance, except KAGRA, located underground, which might be differently affected by this phenomenon.

Results

Conclusion