Update On The Code Intercomparison and Benchmark For Muon Fluence and Absorbed Dose Induced By An 18-GeV Electron Beam After Massive Iron Shielding

TL;DR

This paper updates the muon fluence and absorbed dose benchmarks from 1974 by using modern Monte Carlo codes to simulate the SLAC experiment and compare results across models and with historical data.

Contribution

It introduces a modern code-based benchmark for muon shielding experiments, updating and validating past measurements with current simulation tools.

Findings

Consistent results among MARS15, FLUKA2011, and GEANT4 simulations.

Good agreement between simulations and historical SLAC data.

Enhanced understanding of muon shielding with modern computational methods.

Abstract

In 1974, Nelson, Kase and Svensson published an experimental investigation on muon shielding around SLAC high-energy electron accelerators. They measured muon fluence and absorbed dose induced by 14 and 18 GeV electron beams hitting a copper/water beamdump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical models available at that time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the experimental setup and run simulations. The results are then compared between the codes, and with the SLAC data.