Impedance of vacuum components in the ring is very important in the analysis of beam instability. This paper describes the construction of a broadband impedance measurement system. This system applies the Coaxial line methods of M.Sands and J.Rees. The system is made up of HP8720B vector network analyser and a PC computer. A new RF connector is designed to get the inner conductor straining and RF impedance matching. A pillbox cavity is measured by this system. And the result was agreed with MAFIA calculation well.
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