Shielding Studies for Superconducting RF Cavities at Fermilab

TL;DR

This paper presents a semi-empirical approach to predict field emission in superconducting RF cavities, utilizing specialized codes to model radiation and comparing predictions with experimental dose measurements at Fermilab.

Contribution

It introduces a combined modeling method using FISHPACT and MARS15 codes to accurately predict radiation from superconducting RF cavities, validated by experimental data.

Findings

Predicted radiation distributions match measured dose rates.

The method effectively estimates field emission intensities at high gradients.

Validation confirms the model's usefulness for cavity design and safety.

Abstract

A semi-empirical method that allows us to predict intensity of generated field emission in superconducting RF cavities is described. Spatial, angular and energy distributions of the generated radiation are calculated with the FISHPACT code. The Monte Carlo code MARS15 is used for modeling the radiation transport in matter. A comparison with dose rate measurements performed in the Fermilab Vertical Test Facility for ILC-type cavities with accelerating gradients up to 35 MV/m is presented as well.