Aging Study on Resistive Plate Chambers of the CMS muon detector for HL-LHC (Reham Aly)

Presented on General Muon Meeting (GMM) on 27 January 2020. Slides

Introduction

The RPC system has been certified for 10 years of LHC (at nominal luminosity of 1034 cm-2s-1 ).

Longevity program aims to certify that the present RPC detectors can survive the hard background conditions during the HL-LHC period.

A dedicated longevity test is set up at the CERN Gamma Irradiation Facility (GIF++), since July 2016 where few spare RPCs are exposed to a high gamma radiation for a long term period to mimic the HL-LHC operational conditions.

Two chambers are continuously irradiated “IRR. chambers” and two chambers are turn on from time to time and used as a reference “Ref. chambers”

During the longevity test the main detector parameters are monitored as a function of the collected integrated charge.

The plots are an update for approved plots in this link

https://twiki.cern.ch/twiki/bin/view/CMSPublic/RPCLongHF2019

Figures:

dark1.png Figure shows the dark current density measured for RE2/2 chamber at different values of collected integrated charge. The plot shows a stable dark current in time and after collecting 650 mC/cm2 1034 cm-2s-1 Contact: cms-dpg-conveners-rpc@SPAMNOTcernNOSPAMPLEASE.ch

dark2.png dark3.png Figures show the dark currents monitoring of both RE2/2 irradiated and reference chambers, as a function of the integrated charge. The dark current measured at 6.5 kV (left), which represent the ohmic contribution, and at 9.6 kV (right), which also includes the gas amplification. The dark current is almost stable in time after collecting 650 mC/cm2 Contact: cms-dpg-conveners-rpc@SPAMNOTcernNOSPAMPLEASE.ch

dark4.png This figure shows the average noise rate at 9.6 kV , monitored as a function of the integrated charge for both the RE2/2 irradiated and reference chamber. The noise rate is stable in time and after collecting 650 mC/cm2 Contact: cms-dpg-conveners-rpc@SPAMNOTcernNOSPAMPLEASE.ch

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-- AndresCabrera - 2020-11-01

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