Field Emission Analysis in SRF Cavities for PIP-II Using GEANT4

Conference · Wed Sep 24 04:00:00 EDT 2025 · No journal information

DOI:https://doi.org/10.2172/3004876· OSTI ID:3004876

Wijethunga, Sajini A.K. ^[1]; Sukhanov, Alexander ^[1]; Napoly, Olivier Claude ^[1]; McGee, Kellen Elizabeth ^[1]

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1. Fermilab

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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: 89243024CSC000002
• OSTI ID: 3004876
• Report Number(s): FERMILAB-POSTER-25-0240-PIP2-TD; oai:inspirehep.net:3066376
• Conference Information: Journal Name: No journal information
• Country of Publication: United States
• Language: English