Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA

作者：Machida S^*; Barlow R; Berg J S; Bliss N; Buckley R K; Clarke J A; Craddock M K; D' Arcy R; Edgecock R; Garland J M; Giboudot Y; Goudket P; Griffiths S; Hill C; Hill S F; Hock K M; Holder D J; Ibison M G; Jackson F; Jamison S P; Johnstone C; Jones J K; Jones L B; Kalinin A; Keil E; Kelliher D J; Kirkman I W; Koscielniak S; Marinov K; Marks N; Martlew B; McIntosh P A; McKenzie J W; Meot F; Middleman K J

来源：Nature Physics, 2012, 8(3): 243-247.

DOI：10.1038/NPHYS2179

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 %26apos;scaling%26apos; 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.

• 出版日期2012-3