Journal
NATURE PHYSICS
Volume 8, Issue 3, Pages 243-247Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2179
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Funding
- BASROC/CONFORM under Engineering and Physical Sciences Research Council (EPSRC) [EP/E032869/1]
- UK Neutrino Factory under Particle Physics and Astronomy Research Council (PPARC) [2054]
- Science and Technology Facilities Council (STFC)
- National Sciences and Engineering Research Council of Canada (NSERC) [SRO 328338-05]
- US Department of Energy [DE-AC02-98CH10886, DE-AC02-07CH11359]
- Science and Technology Facilities Council [ST/G004277/1, ST/G502420/1, ST/G008248/1] Funding Source: researchfish
- EPSRC [EP/E032869/1] Funding Source: UKRI
- STFC [ST/G008248/1, ST/G502420/1, ST/G004277/1] Funding Source: UKRI
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In a fixed-field alternating-gradient (FFAG) accelerator, eliminating pulsed magnet operation permits rapid acceleration to synchrotron energies, but with a much higher beam-pulse repetition rate. Conceived in the 1950s, FFAGs are enjoying renewed interest, fuelled by the need to rapidly accelerate unstable muons for future high-energy physics colliders. Until now a 'scaling' principle has been applied to avoid beam blow-up and loss. Removing this restriction produces a new breed of FFAG, a non-scaling variant, allowing powerful advances in machine characteristics. We report on the first non-scaling FFAG, in which orbits are compacted to within 10mm in radius over an electron momentum range of 12-18 MeV/c. In this strictly linear-gradient FFAG, unstable beam regions are crossed, but acceleration via a novel serpentine channel is so rapid that no significant beam disruption is observed. This result has significant implications for future particle accelerators, particularly muon and high-intensity proton accelerators.
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