MULTITASKING MEASURING SYSTEM OF THE BACKING CALORIMETER FOR THE ZEUS EXPERIMENT AT THE HERA ACCELERATOR

The paper is devoted to the subject of application of a complex measurement system in HEP experiments. The measurement system is electronic, FPGA-based, multi-channel and distributed. The application is the Backing Calorimeter (BAC) located in an international ZEUS experiment at the HERA ring accelerator of counter-propagating particles, DESY Hamburg. The hadron-electron ring accelerator HERA is concisely characterized in the introductory part of the paper. Actually, the HERA accelerates electrons or positrons and protons. The particle collision takes place in detectors. One of them is ZEUS. The structure of ZEUS is presented with emphasis on the metrological requirements. These requirements are to obtain a good space and time resolution of measurements for numerable physical values. The measurements are taken from images of particle collisions. The measurement subsystems of the BAC detector are described. The BAC is equipped with over 40000 nondependent channels for position measurement, over 2000 channels for energy measurement. It possesses a local functional block of position and energy trigger, as well as modules for data acquisition. The functional structure of the system is presented in the context of task requirement superimposed by the ZEUS. These requirements are: global triggering system of the whole experiment, data acquisition and tests. The hardware solutions are included for particular parts of the measurement systems. Examples are presented of measurement results obtained from the ZEUS experiment. An original author’s idea is debated to integrate the functional layers of the complex measurement system with a superimposed diagnostic layer. The aim is to have operator’s access to the current on-line quality assessment of TRIDAQ measurement system for ZEUS. This includes the ability to detect, localize and prevent randomly appearing irregularities in system software and hardware.

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