R. Savage, B. Bhawal, M. Evans, S. Klimenko, E. Maros, M. Rakhmanov, H. Yamamoto

The LIGO project is developing a software toolbox for time-domain simulation of gravitational-wave detectors.  This toolbox, the LIGO End-to-End Simulation Package, is being utilized to build a model of the 2-kilometer interferometer presently under construction at the LIGO Hanford observatory. This model is intended to aid in the shakedown and integration of the interferometer subsystems, and ultimately the optimization of detector sensitivity.

Detector subsystems being integrated into the model include the pre-stabilized laser, the input
optics, the core optics, suspensions, seismic isolation, and the interferometer sensing and control subsystem. Capabilities of the model include fast cavity simulation, feedback control loop electronics modeling, and three-dimensional, multi-mode optical beam propagation using measured free-running noise levels and as-built system parameters.

Implementation of each subsystem in the model and comparison of modeling predictions with experimental results will be discussed.