The charged particle trigger of the CELLO-detector

The fast charged particle trigger of the CELLO-detector at the PETRA e /sup +/e/sup -/-storage ring (DESY) is a fast software programmable hardware processor. It is using multiwire chamber signals as inputs and takes a decision on charged tracks coming from the interaction region in less than 1 mu sec. The input signals are addressing RAMs, in which the mask schemes of all meaningful physical tracks are stored. The RAM output signals give information about the numbers and shapes of the valid masks found. This information is used for fast event acquisition and online data analysis done by a PDP 11 computer. (3 refs).