iRPC Front End electronics cooling system in CMS

Document Type

Article

Publication Date

8-2025

Abstract

In view of the High-Luminosity upgrade of LHC, the CMS Muon spectrometer is undergoing a series of upgrade projects,in particular the addition of four new stations featuring improved Resistive Plate Chambers (iRPC), which will cover the pseudo-rapidity range from 1.8 to 2.4. A new Front-End Board (FEB) is designed to read iRPC signals with a very low threshold and a Time Digital Converter (TDC) embedded into a Cyclone V INTEL FPGA with a resolution of 30 ps and a sampling of 100 MHz. In contrast to the previous RPC boards, this one produces 21–22 W of heat in a confined space that needs to be carefully evacuated. A cheap and robust cooling system was designed on the basis of a copper plate and water cooling. This system was first simulated with a Computational Fluid Dynamics package, Ansys Fluent, and then optimized with thermal measurements. In this paper, the system and its prominent features are described. A quantitative comparison between the experimental measurements in the laboratory and the simulation is provided to demonstrate the robustness of this simple cooling system.

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