Resonant-frequency discharge in a multi-cell radio frequency cavity

S. Popović, J. Upadhyay, J. Mammosser, M. Nikolić, L. Vušković

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We are reporting experimental results on a microwave discharge operating at resonant frequency in a multi-cell radio frequency (RF) accelerator cavity. Although the discharge operated at room temperature, the setup was constructed so that it could be used for plasma generation and processing in fully assembled active superconducting radio-frequency cryo-module. This discharge offers a mechanism for removal of a variety of contaminants, organic or oxide layers, and residual particulates from the interior surface of RF cavities through the interaction of plasma-generated radicals with the cavity walls. We describe resonant RF breakdown conditions and address the issues related to resonant detuning due to sustained multi-cell cavity plasma. We have determined breakdown conditions in the cavity, which was acting as a plasma vessel with distorted cylindrical geometry. We discuss the spectroscopic data taken during plasma removal of contaminants and use them to evaluate plasma parameters, characterize the process, and estimate the volatile contaminant product removal.

Original languageEnglish
Article number173301
JournalJournal of Applied Physics
Volume116
Issue number17
DOIs
StatePublished - Nov 7 2014
Externally publishedYes

Funding

FundersFunder number
U.S. Department of Energy

    Fingerprint

    Dive into the research topics of 'Resonant-frequency discharge in a multi-cell radio frequency cavity'. Together they form a unique fingerprint.

    Cite this