18–26 Sept 2025
Ito International Research Center
Asia/Tokyo timezone

Field emission analysis in SRF cavities for PIP-II using GEANT4

TUP24
23 Sept 2025, 14:30
3h
Ito International Research Center

Ito International Research Center

Tokyo
Board: TUP24
Poster Presentation MC3: Cavities Tuesday Poster Session

Speaker

Kellen McGee (Fermi National Accelerator Laboratory)

Description

Field emission (FE) remains a significant hurdle for achieving optimal performance and reliability in superconducting radiofrequency (SRF) cavities used in accelerator cryomodules. A thorough understanding of the generation and propagation of FE-induced radiation is therefore essential to mitigate this problem. The absence of standardized measurement protocols further complicates the comparison of radiation data across different testing phases and facilities. This highlights the need for a precise quantitative method to diagnose and analyze FE-induced radiation. Such efforts could prove beneficial for improving cavity preparation and cleanroom assembly techniques during the prototype and production stages of Fermilab's Proton Improvement Plan-II (PIP-II) project. This study presents the initial steps of detailed Geant4 simulations aimed at analyzing FE-induced radiation in the low-beta 650 MHz 5-cell elliptical (LB650) cavity. Our goal is to combine these results with radiation diagnostics to enhance diagnostic accuracy and optimize detector positioning. This integrated approach ultimately aims to improve the preparation, assembly, and testing procedures for PIP-II SRF cavities, ensuring the delivery of FE-free cryomodules.

Funding Agency

This manuscript has been authored by Fermi Forward Discovery Group, LLC, under Contract No. 89243024CSC000002 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

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Author

Sajini Wijethunga (Fermi National Accelerator Laboratory)

Co-authors

Alexander Sukhanov (Fermi National Accelerator Laboratory) Dr Olivier Napoly (Fermi National Accelerator Laboratory) Kellen McGee (Fermi National Accelerator Laboratory)

Presentation materials

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