PMT operation monitoring

There are two ways to monitor PMT/detector performance. The first is based on a scaler display program which provides information about PMT counting rates and coincidence counting rates. A large variation of the rates between paddles is an indication of a possible problem. The second technique is to use the analysis code ESPACE and the kumac files developed by K. Takahashi (``kazu'' files). This analysis provides amplitude spectra for events with good tracks in the VDC. Histograms of amplitudes and average amplitudes for each PMT are accumulated. For high efficiency of the trigger it is important to keep the average amplitude above 600 channels. Sample spectra are shown in Fig  5.8.

Figure 5.8: Average Amplitudes of HA Trigger Counters.

1.