Strategy for developing fast bunch feedback systems for KEKB

KEKB, an asymmetric collider project for the B-physics, is now under construction at KEK Japan. In order to overcome the problem due to expected coupled bunch instabilities, we are developing bunch feedback systems. In these feedback systems we will use signal process systems based on the simple 2-tap filters. The fabrication of the prototype of the signal process board has completed and it worked well in the feedback experiments performed in AR at KEK.