Title: Mirror actuation design for the interferometer control of the KAGRA gravitational wave telescope,
Abstract: KAGRA is a 3-km cryogenic interferometric gravitational wave telescope
located at an underground site in Japan. In order to achieve its target
sensitivity, the relative positions of the mirrors of the interferometer must
be finely adjusted with attached actuators. We have developed a model to
simulate the length control loops of the KAGRA interferometer with realistic
suspension responses and various noises for mirror actuation. Using our model,
we have designed the actuation parameters to have sufficient force range to
acquire lock as well as to control all the length degrees of freedom without
introducing excess noise.