Abstract
Single-bunch beam properties such as bunch lengthening and instability that are very important factors to develop storage ring free electron lasers (SRFEL) have been investigated on the UVSOR electron storage ring. Data were analyzed based on a model of potential-well distortion due to the impedance of the vacuum pipe. The inductive impedance was obtained to be 40 nH which is approximately 10 times larger than that of a newly constructed 3rd generation light source. In an operation with negative momentum compaction factor, the bunch shortening was observed which is also explained by which the inductive impedance dominates the single bunch property on the UVSOR ring.
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