8 Improvements in Cavity Preparation
8.1 Comparisons of Cold and Warm Electropolishing Methods
Section 3.12 on N-doping for LCLS-HE cavities discussed how electropolishing (EP) at cold temperatures [327] (T < 16 °C) for the final EP stage improves cavity performance. After removing the first few μm impregnated with nitrides, the performance improves significantly, for example from 20 to 24 MV/m. Figure 8.1 gives statistics [168] to show how the number of cavities that exceed 23 MV/m drops from 100% to below 10% when the EP temperature rises from 12 to 18 °C.
Figure 8.2 a shows performance improvement for a 650 MHz N-doped cavity with cold EP. The maximum field achieved increases from about 20 MV/m to about 25 MV/m [157]. One possible explanation ...
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