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- W2779006571 abstract "An apparatus and a method for etching of the inner surfaces of superconducting radio frequency (SRF) accelerator cavities are described. The apparatus is based on the reactive ion etching performed in an Ar/Cl2 cylindrical capacitive discharge with reversed asymmetry. To test the effect of the plasma etching on the cavity rf performance, a 1497 MHz single cell SRF cavity was used. The single cell cavity was mechanically polished and buffer chemically etched and then rf tested at cryogenic temperatures to provide a baseline characterization. The cavity’s inner wall was then exposed to the capacitive discharge in a mixture of Argon and Chlorine. The inner wall acted as the grounded electrode, while kept at elevated temperature. The processing was accomplished by axially moving the dc-biased, corrugated inner electrode and the gas flow inlet in a step-wise manner to establish a sequence of longitudinally segmented discharges. The cavity was then tested in a standard vertical test stand at cryogenic temperatures. The rf tests and surface condition results, including the electron field emission elimination, are presented." @default.
- W2779006571 created "2018-01-05" @default.
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- W2779006571 date "2017-12-01" @default.
- W2779006571 modified "2023-10-16" @default.
- W2779006571 title "Cryogenic rf test of the first SRF cavity etched in an rf Ar/Cl<sub>2</sub> plasma" @default.
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- W2779006571 doi "https://doi.org/10.1063/1.4991888" @default.
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