Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA
Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA
复制标题
DOI：
10.1038/nphys2179
复制
发表时间：
2012-01
期刊：
影响因子：
19.6
通讯作者：
S. Machida;R. Barlow;J. Berg;N. Bliss;R. Buckley;J. Clarke;M. Craddock;R. D’Arcy;R. Edgecock-R
中科院分区：
文献类型：
--
作者：
S. Machida;R. Barlow;J. Berg;N. Bliss;R. Buckley;J. Clarke;M. Craddock;R. D’Arcy;R. Edgecock-R
在固定场交变梯度（FFAG）加速器中，消除脉冲磁体操作允许快速加速同步加速器能量，但具有更高的束脉冲重复率。 FFAG 诞生于 20 世纪 50 年代，由于未来高能物理对撞机需要快速加速不稳定的 μ 子，因此它重新引起了人们的兴趣。到目前为止，已应用“缩放”原理来避免光束爆炸和损失。消除这一限制产生了新型 FFAG，这是一种非缩放变体，可以在机器特性方面取得巨大进步。我们报告了第一个非缩放 FFAG，其中轨道在 12–18MeV/c 的电子动量范围内被压缩到半径在 10mm 以内。在这个严格线性梯度 FFAG 中，不稳定的光束区域被交叉，但通过新型蛇形通道的加速非常快，以至于没有观察到明显的光束中断。这一结果对未来的粒子加速器，特别是μ子和高强度质子加速器具有重要意义。
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 10 mm 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.