Study of gas cluster ion beam surface treatments for mitigating RF breakdown

Surface processing with high-energy gas cluster ion beams (GCIB) is investigated for increasing the high voltage breakdown strength of RF cavities and electrodes in general. Various GCIB treatments were studied for Nb, Cu, Stainless Steel and Ti electrode materials using beams of Ar, Ar + H 2, O 2,...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2006-07, Vol.441 (1), p.75-78
Main Authors: Swenson, D.R., Degenkolb, E., Insepov, Z.
Format: Article
Language:English
Subjects:
Applied sciences
Electrical engineering. Electrical power engineering
Exact sciences and technology
Field emission
Gas cluster ion beam
Power electronics, power supplies
RF breakdown
Surface treatment
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Summary:Surface processing with high-energy gas cluster ion beams (GCIB) is investigated for increasing the high voltage breakdown strength of RF cavities and electrodes in general. Various GCIB treatments were studied for Nb, Cu, Stainless Steel and Ti electrode materials using beams of Ar, Ar + H 2, O 2, N 2, Ar + CH 4, or O 2 + NF 3 clusters with accelerating potentials up to 35 kV. Etching using chemically active clusters such as NF 3 reduces the grain structure of Nb used for SRF cavities. Smoothing effects on stainless steel and Ti substrates were evaluated using SEM and AFM imaging and show that 200 nm wide polishing scratch marks are greatly attenuated. Using a combination of Ar and O 2 processing for stainless steel electrode material, the oxide thickness and surface hardness are dramatically increased. The DC field emission of a 150-mm diameter sample of GCIB processed stainless steel electrode material was a factor of 10 6 less than a similar untreated sample.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2006.03.039