Measurements of the relative sensitivities between some beam-loss monitors, PART II

We measured the relative sensitivity of various types of classical beam-loss monitors following on from and in the spirit of a previous work. The detectors were tested in one of the SPS extraction l ines. The particles passing through the line consist of 2/3 protons and 1/3 pions at 120 Gev/c. The low extracted (spill time 2.5 s) beam intensity can be adjusted. Upstream of the detectors a copp er target (diameter: 7 cm, length: 50 cm) can be placed on the beam axis. First we proceed with linearity and sensitivity measurements of various types of detectors used in counting or analog mode. Next, with a view to increasing the dynamic range we pursue out tests with a dedicated type of electronics. Finally, measurements have been made in order to determine, in the frame of our experiment , the minimum detection level of some monitors.