First Experimental Demonstration of Beam Storage by Three-Dimensional Spiral Injection Scheme for Ultra-Compact Storage Rings

TL;DR

This paper demonstrates the first successful beam storage in an ultra-compact ring using a novel three-dimensional spiral injection scheme, validated through experimental results and Monte Carlo simulations, paving the way for advanced precision measurement devices.

Contribution

It introduces and experimentally validates a three-dimensional spiral injection method for beam storage in ultra-compact rings, a novel approach in the field.

Findings

Successful storage of 297 keV/c electron beam in a 22 cm ring

Beam signals observed >5σ above noise for over 1 μs

Storage region shifts with field potential, matching simulations

Abstract

Three-dimensional spiral injection enables beam storage in ultra-compact rings with nanosecond revolution periods. We report first storage of a $297 \, \mathrm{keV/}c$ electron beam in a $22 \,\mathrm{cm}$ weak-focusing ring with a $4.7\,\mathrm{ns}$ revolution period using a $140\,\mathrm{ns}$ kicker pulse. A scintillating-fiber detector observes signals $>5\sigma$ above noise for $\geq 1\, \mathrm{\mu s}$, and varying the weak-focusing field potential shifts the stored-beam region, consistent with Monte Carlo predictions, validating beam storage. This proof-of-principle opens a path to ultra-compact storage rings for next-generation precision measurements.