RPC upgrade project for CMS Phase II

Abstract

The Muon Upgrade Phase II of the Compact Muon Solenoid (CMS) aims to guarantee the optimal conditions of the present system and extend the η coverage to ensure a reliable system for the High Luminosity Large Hadron Collider (HL-LHC) period. The Resistive Plate Chambers (RPCs) system will upgrade the off-detector electronics (called link system) of the chambers currently installed chambers and place improved RPCs (iRPCs) to cover the high pseudo−rapidity region, a challenging region for muon reconstruction in terms of background and momentum resolution. In order to find the best option for the iRPCs, an R&D program for new detectors was performed and real size prototypes have been tested in the Gamma Irradiation Facility (GIF++) at CERN. The results indicated that the technology suitable for the high background conditions is based on High Pressure Laminate (HPL) double-gap RPC. The RPC Upgrade Phase II program is planned to be ready after the Long Shutdown 3 (LS3).

Towards a two-dimensional readout of the improved CMS Resistive Plate Chamber with a new front-end electronics

“…Due to the large background expected in the High Luminosity LHC (HL-LHC), the RPC detector system needs to be upgraded in order to achieve the spatial resolution imposed by trigger requirements and to increase its rate capability, so to be able to work efficiently in high rate environment. The RPC system upgrade will take place during the CMS Phase-II upgrade program [6]. The best way to improve the spatial resolution consists in developing a two-dimensional readout, while a high rate capability implies developing front-end (FE) electronics able to detect signals of the order of few hundreds μV, allowing a drastic reduction of the average charge per count [7].…”