Fast Electronic Modules for Nuclear Physics Experiments

Fast electronic modules for nuclear physics experiments are under design at Dubna. In this paper the following modules are described: a pulse shaper with a fixed discriminating level, a pulse shaper using the constant fraction of pulse height technique, two-fold coincidence unit. The modules for discriminating and timing signals contain the fan-out standard circuit with both nanosecond logic and subnanosecond outputs. The compensation of temperature variations of the discriminating level and the compensation of time drift of subnanosecond output pulses has been designed and introduced in modules. In our pulse shlapers after the temperature compensation was introduced, the long time stability and time drift of subnanosecond logic output pulses were measured and found within ± 10 ps/ 24 hours. The attempts are made to build a coincidence-anticoincidence logic for nuclear physics experi-FWHM.ments with the time resolution of 0.5 ns at