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The three-dimensional spiral injection scheme enables beam storage in ultra-compact storage rings where few-nanosecond revolution periods make single-turn kicker injection impractical. We demonstrate this concept by storing a 297 keV/c electron beam in a 22 cm-diameter weak-focusing solenoidal ring with a 5 ns revolution period. We applied a kicker-current pulse with a 45 A peak and a 140 ns pulse length to provide multi-turn vertical steering. An insertable scintillating-fiber monitor observed stored beam signals persisting for more than 1 microsecond, whereas the beam was lost within about 100 ns without the kicker. Independent measurements further confirmed that the beam is stored in the intended weak-focusing region. This proof-of-principle establishes the feasibility of beam injection into ultra-compact rings and provides an important step toward future precision measurements, including the Muon g-2/EDM experiment at J-PARC and the muEDM experiment at PSI.
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