Integration and Performance of the Newtonian Calibrator and IWAVE for Exploring the Laser Interferometer Gravitational Wave Observatory Data.

Upgrades to IWAVE, a frequency tracking tool invented by Edward J. Daw
at the University of Sheffield, has expanded the utility of the tool. Resonant
characteristics observed in the Laser Interferometer Gravitational Wave Observa-
tories - such as violin modes, test mass body modes and calibration signals - can
be resolved accurately, even in tightly packed regions of frequency space using a
multi-line tracker in real-time on the LIGO front end.
Furthermore, using IWAVE to develop test mass thermometers, real-time esti-
mates of the test mass temperature is available, useful for thermal tuning of LIGO.
This is achieved by tracking and calibrating test mass body modes, a coupling be-
tween the laser TEM modes and the mechanical response of the optics. The test
mass thermometers can be extrapolated into a larger thermal monitoring pipeline
useful for current and future gravitation wave observatory thermal modelling.
The LIGO calibration is a complicated folding of the many control systems
noise sources that affect the interferometer. Presented here is the installation,
commissioning and successful operation of the LIGO Hanford Newtonian Calibra-
tor - a new R&D effort with the University of Washington that uses a spinning
constellation of masses - to induce length changes in the interferometer arms by
applying a small force to the test mass. These forces are modelled with three real-
isations of Newton Law of Gravity and all show good agreement to one another.