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.
@article{arxiv.1809.06571,
title = {A compensated multi-gap RPC with 2 m-long strips for the LEPS2 experiment},
author = {K. Watanabe and S. Tanaka and W. C. Chang and H. Chen and M. L. Chu and J. J. Cuenca-Garcia and T. Gogami and D. Gonzalez-Diaz and M. Niiyama and Y. Ohashi and H. Ohnishi and N. Tomida and M. Yosoi},
journal= {arXiv preprint arXiv:1809.06571},
year = {2019}
}