Abstract

A beam monitor is developed at the Rare-RI Ring storage ring facility at the RI beam factory at RIKEN. Because the Rare-RI Ring stores only a single exotic ion according to the operation principle, conventional beam instruments cannot be employed. In the present study, we design a simple monitoring system to confirm particle storage. The system comprises a thin foil and scintillators with photon sensors. When an ion passes through the foil, secondary electrons, including δ-rays, are emitted and are detected by a set of scintillation detectors without any guiding field. A beam test using 78Ge with 175 MeV/nucleon successfully demonstrates the periodic revolution of the stored ions.

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