Optimization attempts for time resolution in fast-slow coincidence systems

A systematic investigation to obtain good time resolutions with proper shape of the resolution curve in fast-slow coincidence systems is described. Measuring the output time-walk as a function of the input signal amplitude for fast timing discriminators, it was possible to choose an input signal amplitude range resulting in small time uncertainty and thus to achieve a good time resolution almost independent of the dynamic range. With an additional fast gating line a more gaussian shape of the resolution curve with less pronounced tails on both sides could be obtained