Masaki Ando, and the TAMA collaboration.

The TAMA interferometer is now under development with almost final configuration except for power recycling. As a laser source, we use an injection-locked Nd:YAG laser with output power of 10W. The laser beam is mode- cleaned and frequency-stabilized with a 10m triangle mode cleaner. The main interferometer is a Michelson interferometer with 300m Fabry-Perot arm cavities. The main interferometer is controlled using signals extracted by a frontal modulation scheme. The differential motion signal of the arm cavities is fed back to the front mirrors of the cavity, while the common motion signal is fed back to the mode cleaner and the laser source. The interference fringe is kept dark at the detection port by controlling the beamsplitter motion. In addition, the interferometer is operated stably with alignment control system. We describe in detail the current status of the TAMA300 interferometer,  its optical configuration, control system, sensitivity, and stability of operation.