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

A time domain simulation program has been written to simulate gravitational wave detectors using a laser interferometer, like TAMA and LIGO experiment. The program is written in C++ based on a modular design. The field and optics are simulated based on a time domain modal model. The program can be viewed as a software toolbox, like matlab, and complex systems can be simulated by combining building blocks. This applies in all parts of the simulation program, optics, mechanics and electronics. The modular design makes it easy to add a new functionality, and various levels of collaborative efforts become possible. There is a GUI front-end of the simulation package. The user can build a system using GUI, not by writing codes using low level languages. This makes it possible for all kinds of scientists use the computer simulation to help the hardware design and development. Modeling of the LIGO subsystems is going. The status report of the development will be presented, and the comparison of the LIGO subsystem measurements and the simulation data will be also be presented.