Abstract

Abstract Two Multigap Resistive Plate Chambers (MRPCs) were built with thin (0.4 mm) low-resistive glass sheets for the inner plates and standard 0.28 mm ‘soda lime’ float glass as external plates. The 6-gap MRPC reaches 96.5% efficiency at 15.6 kV and a time resolution of 68 ps at an instantaneous particle flux around 2.5 kHz/cm 2 . The 20-gap MRPC reaches 98% efficiency at 18.8 kV and a time resolution of 32 ps. Compared to a 6-gap MRPC built previously with all plates made with soda-lime float glass, the two MRPCs made with low-resistive inner glass show a much higher count rate capability. A third MRPC with all plates made from low-resistive glass was also constructed to verify the operation at high particle flux. In this paper a relative rate capability comparison between the MRPCs has been performed under a pulsed beam with a small spot on the chamber. Their rate capability under full illumination with continuous particle flux needs to be further studied.

Highlights

  • The excellent timing performance of Multigap Resistive Plate Chamber (MRPC) makes it widely used in high energy physics and nuclear experiments

  • This higher electric field needed for the normal 6-gap MRPC is caused by the voltage drop across the resistive plates caused by the charge created by avalanches initiated by through-going charge particles

  • For the inner 20-gap low resistivity chamber; it has two high resistivity plates compared to the 11 plates of the MRPC presented previously [9]; we would expect a rate capability to improve by a factor 5.5

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Summary

A Multigap Resistive Plate Chamber built with thin low-resistive glass

Z. Liu a,b,∗, M.C.S. Williams a,c,d, A. Zuyeuski b,e a European Centre for Nuclear Research (CERN), Geneva, Switzerland b ICSC World Laboratory, Geneva, Switzerland c Gangneung-Wonju National University, Gangneung, South Korea d INFN and Dipartimento di Fisica e Astronomia, Universit di Bologna, Italy e Museo Storico della Fisica e Centro Studi e Ricerche E.Fermi, Roma, Italy

Introduction
MRPC construction
Experiment setup
High voltage scan of MRPCs
Flux scan of MRPCs
Discussion
Full Text
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