LINAC2026 - 33rd Linear Accelerator Conference

Measurement of Loaded and Intrinsic Q-Factors of Overcoupled SRF Cavities Operated in SEL Mode

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC4.A08: Superconducting RF Poster Session

Speaker

Dr Sergey Kuzikov (Thomas Jefferson National Accelerator Facility)

Description

We describe a method for measuring the loaded and intrinsic quality factors, the external quality factor, and cavity detuning using algorithms based on solutions of the cavity differential equations in the I/Q domain. We report measurement results for Nb₃Sn cavities at Jefferson Lab’s UITF facility. The measurements include several tens of forward, probe, and reflected signal traces, each several minutes long, recorded at various accelerating gradients and with different klystron amplitude modulation profiles. We evaluated several noise-reduction and Q-factor fitting methods, achieving good accuracy for loaded and external Q values and satisfactory accuracy for Q₀.