Investigations of surface quality and SRF cavity performance

TL;DR

This paper investigates how surface quality impacts SRF cavity performance, concluding that surface roughness plays a secondary role compared to other primary factors affecting cavity limitations.

Contribution

It provides a comparative analysis of various single cell cavities, highlighting the limited influence of surface roughness on RF performance amidst other dominant factors.

Findings

Surface roughness has a secondary effect on cavity performance.

Other primary factors significantly influence cavity limitations.

Progress in niobium cavity manufacturing has advanced performance analysis.

Abstract

Magnetic field enhancement has been studied in the past through replica and cavity cutting. Considerable progress of niobium cavity manufacturing and processing has been made since then. Wide variety of single cell cavities has been analyzed through replica technique. Their RF performances were compared in corresponding to geometric RF surface quality. It is concluded that the surface roughness affects cavity performance mostly in secondary role. The other factors must have played primary role in cavity performance limitations.