Performance of TOF-RPC for the BGOegg experiment

TL;DR

This paper reports on the development and calibration of a resistive plate chamber-based time-of-flight detector for the BGOegg experiment, achieving a time resolution of approximately 60 ps despite signal reflection challenges.

Contribution

The paper introduces a large-area RPC detector with minimal readout channels and calibration techniques to enhance timing resolution in particle detection.

Findings

Achieved a time resolution of ~60 ps in the BGOegg-RPC.

Successfully covered 320 cm x 200 cm area with only 256 readout channels.

Developed calibration methods to mitigate signal reflection effects.

Abstract

We constructed a new time-of-flight (TOF) detector consisting of resistive plate chambers (RPCs) to measure particle energy in the BGOegg experiment. The BGOegg-RPC has a unique feature which enables us to cover a large area with a small number of readout channels. For this purpose, we developed the RPC with a strip size of 2.5 cm $\times$ 100 cm. The BGOegg-RPC covers an area of 320 cm $\times$ 200 cm with only 256 channels of readout electronics. In case of large readout RPCs, an originated signal is distorted and dispersed during propagation. In addition, there happens a signal reflection at the end of the strip. Although we designed the BGOegg-RPC and front-end electronics with minimized signal reflection, a small reflection still remained, deteriorating the resulting time resolution. After establishing calibration and correction methods to improve the performance of the BGOegg-RPC, we obtained the time resolution of {\sigma}~60 ps around the central region of strips.