Single electron storage at UVSOR-III

We successfully demonstrated single electron storage in the UVSOR-III electron storage ring. The electron beam intensity is reduced using a beam scraper while measuring the ultraviolet synchrotron radiation from an undulator. We succeeded in observing a step-function like intensity change, which corresponds to a loss of one electron. In parallel, we observed the filling of the electrons in the RF buckets and confirmed the last electron was stored in one RF bucket. We also succeeded in accumulating single electrons for more than two hours. This unique operation mode may be useful for basic researches on synchrotron radiation and developments of novel light source technologies. (author)