ePubs

The open archive for STFC research publications

Full Record Details

Persistent URL http://purl.org/net/epubs/work/65878883
Record Status Checked
Record Id 65878883
Title Evidence for RF breakdowns causing surface anomalies on caesium telluride cathodes at CLARA
Contributors
Abstract The Compact Linear Accelerator for Research and Applications (CLARA) at Daresbury Laboratory has recently undertaken an upgrade of its photocathodes from using a copper emission surface to using caesium telluride (Cs2Te). During the conditioning of the first Cs2Te cathode a significant number of RF breakdowns were detected, and so that cathode was replaced; subsequent inspection of the cathode following removal identified a number of surface defects. To better study the second cathode, a diagnostic camera was used to collect images of the surface \textit{in situ} during RF conditioning; the frequent formation over time of surface defects was observed. In this paper we present a statistical analysis of the breakdown events and surface image data, utilizing cross-correlation of the signal derivatives to account for cumulative trends. The analysis reveals a correlation between the rate of defect formation and the incidence of RF breakdowns, with a Pearson coefficient of at zero time lag. These results provide quantitative evidence that RF breakdown events are the likely driver of surface morphology changes on Cs2Te cathodes.
Organisation ASTeC , ASTeC-AP , ASTeC-MaRS , CI , STFC , CLARA , CLARA-ACC
Keywords
Funding Information
Related Research Object(s):
Licence Information:
Language English (EN)
Type Details URI(s) Local file(s) Year
Paper In Conference Proceedings In 17th International Particle Accelerator Conference (IPAC 26), Deauville, France, 17-22 May 2026, (2026). 2026