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First Experimental Demonstration of Beam Storage by a Three-Dimensional Spiral Injection Scheme for Ultracompact
R Matsushita1, H Iinuma2, S Ohsawa3
1University of Tokyo, Graduate School of Science, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Physical Review Letters
|July 26, 2026
Summary
Researchers achieved electron beam storage in a compact ring using 3D spiral injection. This breakthrough enables ultracompact storage rings for precision measurements and studying short-lived particles.
Area of Science:
- Particle accelerators
- Beam physics
Background:
- Conventional storage rings are large and expensive.
- Nanosecond revolution periods are desirable for certain precision measurements.
Purpose of the Study:
- To demonstrate beam storage in an ultracompact ring.
- To validate a novel three-dimensional spiral injection technique.
Main Methods:
- Utilized a 22 cm weak-focusing ring.
- Employed a 140 ns kicker pulse for electron beam injection.
- Observed stored beam signals using a scintillating-fiber detector.
- Varied weak-focusing field potential to study beam behavior.
Main Results:
- Successfully stored a 297 keV/c electron beam.
- Achieved a revolution period of 4.7 ns.
- Detected signals >5σ above noise for ≥1 μs.
- Observed beam region shifts consistent with Monte Carlo predictions.
Conclusions:
- Proof-of-principle for beam storage in ultracompact rings achieved.
- Validates 3D spiral injection for nanosecond revolution periods.
- Opens possibilities for next-generation precision measurements and short-lived particle studies.
