Abstract
In recent years, a gravitational wave detector TAMA300 has been upgraded for low frequency noise reduction. Its main subject is to install new seismic attenuation system TAMA SAS for all of four test mass mirrors. To benefit from the excellent performance of TAMA SAS, digital control systems are necessary to damp low frequency resonances. However, the digital control system has a demerit of large ADC and DAC noises. To reduce such digital control noises, pre-emphasis and de-emphasis filters are introduced. By applying these systems, the detector noise reduction below 100 Hz was realized. In this paper, I would like to present the current status of the digital control system and of the new analog filters to reduce digital control noises.
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