Energy deposition studies for the LBNE beam absorber

TL;DR

This study uses advanced Monte Carlo simulations to analyze energy deposition in the LBNE beam absorber and surrounding shielding, considering various design options and operational conditions.

Contribution

It presents a comprehensive model of the LBNE facility with detailed energy deposition analysis using the MARS15 code and ROOT-based geometry, including thermal considerations.

Findings

Identified optimal absorber design options based on energy deposition and thermal analysis.

Compared different fill gases in the decay pipe for radiation shielding effectiveness.

Evaluated various absorber mask materials and shapes for improved performance.

Abstract

Results of detailed Monte Carlo energy deposition studies performed for the LBNE absorber core and the surrounding shielding with the MARS15 code are described. The model of the entire facility, that includes a pion-production target, focusing horns, target chase, decay channel, hadron absorber system -- all with corresponding radiation shielding -- was developed using the recently implemented ROOT-based geometry option in the MARS15 code. This option provides substantial flexibility and automation when developing complex geometry models. Both normal operation and accidental conditions were studied. Various design options were considered, in particular the following: (i) filling the decay pipe with air or helium; (ii) the absorber mask material and shape; (iii) the beam spoiler material and size. Results of detailed thermal calculations with the ANSYS code helped to select the most viable absorber design options.