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
Summary
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
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