CMS RPC Background -- Studies and Measurements

TL;DR

This study uses detailed MC simulations to predict the radiation background in the CMS RPC system for HL-LHC scenarios, focusing on particle rates, dose, and fluence, with ongoing updates to the geometry model.

Contribution

It provides the first detailed MC-based background predictions for the CMS RPC system at HL-LHC, including safety factors and plans for model updates.

Findings

Predicted particle rates, dose, and fluence for HL-LHC scenarios

Background estimates with safety factors of 3

Plans for incorporating complete RPC upgrade geometry

Abstract

The expected radiation background in the CMS RPC system has been studied using the MC prediction with the CMS FLUKA simulation of the detector and the cavern. The MC geometry used in the analysis describes very accurately the present RPC system but still does not include the complete description of the RPC upgrade region with pseudorapidity $1.9 < \lvert \eta \rvert < 2.4$. Present results will be updated with the final geometry description, once it is available. The radiation background has been studied in terms of expected particle rates, absorbed dose and fluence. Two High Luminosity LHC (HL-LHC) scenarios have been investigated - after collecting $3000$ and $4000$ fb$^{-1}$. Estimations with safety factor of 3 have been considered, as well.