Data scanner system of the BELLE silicon vertex detector

A data scanner system, which is a part of the front-end data acquisition system of the BELLE silicon vertex detector, carries out analog-to-digital conversion of preamplified signals from the detector and stores digitized data into local memory. The sequence control and buffer managing are performed by the software process of an on-board CPU. With this data scanner system, we can achieve data acquisition with less than 10% dead time up to 800 Hz trigger rate