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Development of a temperature mapping system for 1.3-GHz 9-cell SRF cavities

The mapping of outer wall temperature during the vertical test of a superconducting radio-frequency (SRF) cavity has been one of the most useful tools to detect bad spots of the cavity. However, few systems except a rotating-arm type one have been developed so far for 9- cell cavities. Since it will be an essential tool to identify the failure of the cavities, we started to develop a fixed- board-type temperature mapping system that will enable us to map the temperature of 9-cell cavities in a much shorter time than rotating-arm type. This paper describes the design, status of the development and preliminary tests of the design.