Trigger Electronics for The TA Fluorescence Detector
Y. Tameda, J. D. Smith, M. M. Tanaka, S. Ogio, A. Taketa, Kenichi Kadota, S. B. Thomas, M. Fukushima, Harunobu Sagawa, T. Matsuda, S. Udo, M. Takeda, Kazunori Hiyama, Hisaki Tokuno · CERN Document Server (European Organization for Nuclear Research) · 2005
In this presentation, we introduce a triggering system developed for the TA fluorescence detectors.The system consists of two types of VME 9U modules, i.e., a Track Finder (TF) module for each telescope and a Central Trigger Distributor (CTD) module which controls 12 cameras in each station.In a cycle of event recognition, a)SDF (Signal Digitizer and Finder) modules carry out fluorescence signal recognitions for each PMT and the results are transferred to TF. b)The main task of TF is to recognize tracks in a camera image, and it sends the result to CTD. c)The CTD module accumulates the results from all the TF modules in a station, and gives a final decision, which is sent back to all the TF modules to trigger the data acquisition processes.The CTD module generates a master clock to synchronize all the electronics, and has a GPS for recording the absolute event time.