Radiation Skyshine Calculation with MARS15 for the mu2e Experiment at Fermilab

TL;DR

This paper presents detailed radiation skyshine calculations using MARS15 for the Mu2e experiment at Fermilab, ensuring compliance with safety standards through comprehensive modeling of the extraction system and surrounding environment.

Contribution

It introduces a complete skyshine calculation model incorporating the entire extraction system and environment for the Mu2e experiment at Fermilab.

Findings

Skyshine model extends 10 km vertically and 5 km radially.

Calculations ensure radiation dose rates meet safety standards.

Model includes detailed components of the extraction system.

Abstract

The Fermilab Antiproton source is to be repurposed to provide an 8 kW proton beam to the Mu2e experiment by 1/3 integer, slow resonant extraction. Shielding provided by the existing facility must be supplemented with in-tunnel shielding to limit the radiation effective dose rate above the shield in the AP30 service building. In addition to the nominal radiation shield calculations, radiation skyshine calculations were required to ensure compliance with Fermilab Radiological Control Manual. A complete model of the slow resonant extraction system including magnets, electrostatic septa, magnetic fields, tunnel enclosure with shield, and a nearby exit stairway are included in the model. The skyshine model extends above the beam enclosure surface to 10 km vertically and 5 km radially.