The Development of Photo-Detector Module Electronics for the JEM-EUSO Experiment

Abstract

The JEM-EUSO focal surface detector consists of about 300,000 photodetector channels that are organized into 137 building blocks called Photo-Detector Module (PDM). A PDM is composed of 36 64-ch MAPMTs, analog ASICs, and digital electronics. The digital electronics, called PDM board, is in charge of readout of 36 MAPMTs via ASICs, control of ASICs via JEM- EUSO central data acquisition system, Level-1 trigger with decision every JEM- EUSO time unit of 2.5 μ s, and buffering of a complete event of Extreme Energy Cosmic Rays typically lasting 200 μ s. On positive trigger, the data of 8 adjacent PDMs is transferred to Cluster Control Board where Level-2 trigger is processed to refine the selection of interesting events. We expect the rate of Level-1 trigger is designed to be 7 Hz with 2 kHz of input data. We present the development of the PDM board for the JEM-EUSO experiment.