CU live time as a function of rate for a random trigger (Benoit Lott, Aug. 2)
The CU live time as a function of trigger rate has been investigated using a random trigger taken from the stochastic noise of a phototube. The rate was adjusted by changing the gain of a fast amplifier placed before the discriminator. The rate of submitted trigger pulses was determined by measuring the number of trigger pulses and those from a 1kHz clock with NIM scalers. The average rate of accepted events was returned by the DAQ application. The ratio of accepted events over submitted trigger pulses corresponds to the live time. The figure below shows the results obtained by applying the rate continuously (red dots).