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High-Frequency Nonlinear Response of Superconducting Cavity-Grade <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Nb</mml:mi></mml:math> Surfaces
The performance of Nb superconducting radio-frequency (SRF) cavities in particle accelerators is often limited by breakdown events below the intrinsic limiting surface fields of Nb. Though excellent rf properties have been achieved, a detailed understanding of the causal links between surface treatment, defects, and ultimate performance is lacking. This study …