FLUKA Run 2 simulation benchmark with beam loss monitors in the CMS forward region

The FLUKA simulation framework is a general purpose Monte Carlo software for nuclear physics applications. It is commonly used by the CMS collaboration to make estimates on radiation levels in the underground cavern and at specific detector locations. The accuracy of the CMS model geometry in FLUKA is of key importance for the reliability of the simulation results which are used by the collaboration for detector instrumentation, radiation monitoring, and environmental protection. It contains simplified geometries and averaged material compositions for a simple and accurate representation of the CMS detector and the underground cavern. To verify the accuracy of the model, benchmark simulations against real measurement data are regularly performed, often by using data taken from radiation monitors in CMS. This note presents results of a simulation benchmark study conducted with measurements of two ionization chambers used as beam loss monitors in the CMS forward zone inside the rotating shield.