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

TL;DR

This paper presents the development of multi-gap resistive plate chambers with long readout strips for the LEPS2 experiment, achieving high time resolution and efficient detection over large areas.

Contribution

Introduction of a novel MRPC design with 2.5 x 200 cm2 strips and optimized configuration for improved timing performance in large-area detectors.

Findings

Achieved ~80 ps time resolution before correction

Reduced to 60 ps after slewing correction

Demonstrated effective suppression of modal dispersion

Abstract

We have developed multi-gap resistive plate chambers (MRPCs) with 2.5 x 200 cm2 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 sigma ~ 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.