RF Characterisation of Laser Treated Copper Surfaces for the Mitigation of Electron Cloud in Accelerators

P. Krkotić (Lead / Corresponding author), S. Calatroni (Lead / Corresponding author), M. Himmerlich, H. Neupert, A. T. Perez-Fontenla, S. Wackerow, A. Abdolvand

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Abstract

In accelerator beam chambers and RF waveguides, electron cloud and multipacting can be mitigated effectively by reducing the secondary electron yield (SEY). In recent years, it has been established that laser-engineered surface structuring is a very efficient method to create a copper surface with a SEY maximum close to or even below unity. Different laser pulse durations, from nanoseconds to picoseconds, can be used to change surface morphology. Conversely, the characteristics that minimise the SEY, such as the moderately deep grooves and the redeposited nanoparticles, might have unfavourable consequences, including increased RF surface resistance. In this study, we describe the techniques used to measure the surface resistance of laser-treated copper samples using an enhanced dielectric resonator with 12 cm diameter sample sizes operating in the GHz range. The quantification basis lies in a non-contact measurement of the high-frequency losses, focusing on understanding the variation of surface resistance levels depending on the specifics of the treatment and possible post-treatment cleaning procedures.

Original languageEnglish
Article number082029
Number of pages6
JournalJournal of Physics: Conference Series
Volume2687
Issue number8
DOIs
Publication statusPublished - Jan 2024
Event14th International Particle Accelerator Conference, IPAC 2023 - Venice, Italy
Duration: 7 May 202312 May 2023
Conference number: 14th
https://www.ipac23.org/

ASJC Scopus subject areas

  • General Physics and Astronomy

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