LIGO Document G1400911-v1

Monitoring Magnetic Fields for Advanced LIGO

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LIGO plans to monitor magnetic fields because they can affect the interferometer's signals. A magnetic field from a Schumann Resonance can affect both LIGO interferometers in a similar way as a gravitational wave. Magnetic field data can be used to figure out whether a signal was caused by a gravitational wave or a magnetic field. We evaluated the quality of four remote locations that can be used to measure Schumann Resonances and Ultra Low Frequency (ULF) waves. Furthermore, eleven magnetometer set-ups around the LIGO Hanford Observatory (LHO) will allow for monitoring magnetic fields specific to LHO. All eleven magnetometer set-ups were improved. Filter boxes were modified in order to obtain accurate magnetic field measurements at 10 Hz. Finally, I determined how close the Uninterruptible Power Supply (UPS), an electronic device that produces a large magnetic field, can be to the interferometer.
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