A compensated multi-gap RPC with 2 m strips for the LEPS2 experiment

Abstract

We have developed multi-gap resistive plate chambers (MRPCs) with 2.5 × 200 cm 2 readout strips for the time-of-flight (TOF) detector system of the LEPS2 experiment at SPring-8. These chambers consist of 2 stacks and 5 gas gaps per stack, in a mirrored configuration. A time resolution of σ ≃ 80 ps was achieved for any position within a strip (at above 99% detection efficiency); after performing the time-charge slewing correction, this value could be reduced to 60 ps. A link between the small contribution of the slewing correction to timing and the suppression of modal dispersion in the detector could be established.

Measuring attenuation in signal propagation in Resistive-Plate Chambers

“…The measurements of 𝐴 𝑓 𝑟 𝑒𝑞𝑢𝑒𝑛𝑐𝑦 on all strips of the four RPCs are displayed in figures 11(a) and 11(b), where the rate of attenuation in frequency 𝐴 𝑓 𝑟 𝑒𝑞𝑢𝑒𝑛𝑐𝑦 was observed to not depend on the surface resistivity of the graphite layer 𝜌 𝑠 . The phenomenon whereby the rate of attenuation in frequency 𝐴 𝑓 𝑟 𝑒𝑞𝑢𝑒𝑛𝑐𝑦 clustering around a constant non-zero value was in principle due to the modal dispersion of signal during propagation, as discussed and observed in [11,14]. The distribution of 𝐴 𝑓 𝑟 𝑒𝑞𝑢𝑒𝑛𝑐𝑦 accounted for the difference between the distributions of 𝐴 amplitude (figure 9) and 𝐴 charge (figure 7).…”

Atmospheric Temperature Effect in Secondary Cosmic Rays Observed With a 2 m2 Ground‐Based tRPC Detector

“…tRPCs can make an optimal use of the multigap technique (Cerrón Zeballos et al., 1996), which allows for the systematic stacking of several gas gaps, in order to achieve time resolutions down to 20 ps in special configurations (An et al., 2008). In fact, tRPCs have recently demonstrated the capability of reaching 60 ps on 2 × 2 m 2 areas, with a modest number of electronic readout channels around 160, and a position resolution at the centimeter scale (Watanabe et al., 2019).…”

Atmospheric Temperature Effect in secondary cosmic rays observed with a two square meter ground-based detector

“…tRPCs can make an optimal use of the multi-gap technique (Cerrón Zeballos et al, 1996), that allows for the systematic stacking of several gas gaps, in order to achieve time resolutions down to 20 ps in special configurations (An et al, 2008). In fact, tRPCs have recently demonstrated the capability of reaching 60 ps on 2 × 2 m 2 areas, with a modest number of electronic readout channels around 160, and a position resolution at the cm-scale (Watanabe et al, 2019).…”