Characteristics of a double gap resistive plate chamber for the endcap region of CMS/LHC: data vs. simulation in avalanche mode

Tests of multigap RPCs for high-η triggers in CMS

“…As shown in figure 3, the mean charges of the muon signals drawn in the four-and sixgap RPCs, measured at the efficiency values in the middle of the plateau, were 1.5 and 0.9 pC, respectively. They were respectively about one third and one fifth of that drawn in a typical 2 mm-thick doublegap RPC when measured with a threshold of 200 fC [9].…”

“…-3 - As shown in figure 3, the mean charges of the muon signals drawn in the four-and sixgap RPCs, measured at the efficiency values in the middle of the plateau, were 1.5 and 0.9 pC, respectively. They were respectively about one third and one fifth of that drawn in a typical 2 mm-thick doublegap RPC when measured with a threshold 200 fC [9]. Comparison of charge distributions of muon signals drawn in double-, four-, and six-gap RPCs allows us to envisage their different scopes in the usable ranges of the avalanche-mode pulses.…”

“…Figure 4 shows the charge distributions drawn in the four-(left) and six-gap (right) RPCs at four different HV eff 's. As figure 4 shows, the upper limits of the avalanche pulses for the four-and six-gap RPCs were about 10 and 6 pC, respectively, while it extended to 25 pC for the double-gap RPCs [9]. Considering the charge distributions and the upper limits of the avalanche pulses, the choices of the threshold values of 150 and 100 fC, respectively, for the four-and sixgap RPCs were expected to be relevant.…”

Gaseous Radiation Detectors

“…By kind permission of Elsevier. is a representative example (Ahn et al, 2004); this study includes a comparison of the experimental results with a simple avalanche multiplication model. As already mentioned, addition of the quenchers to argon in various proportions permits one to lower the operating voltage, with obvious practical advantages.…”

“…The considerable reduction in noise rate that can be obtained with the linseed oil conditioning is shown by the comparison Figure 12.7 Average (top) and streamer precursors total charge (middle) as a function of voltage without and with SF 6 in the gas mixture. The bottom plots show the streamer onset probability (Ahn et al, 2004). By kind permission of Elsevier.…”