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Acceleration in the Linear Non-Scaling Fixed-Field Alternating-Gradient Accelerator EMMA

Nature Physics(2012)SCI 1区

STFC Rutherford Appleton Laboratory

Cited 112|Views30
Abstract
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.
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Particle physics,Techniques and instrumentation,Physics,general,Theoretical,Mathematical and Computational Physics,Classical and Continuum Physics,Atomic,Molecular,Optical and Plasma Physics,Condensed Matter Physics,Complex Systems
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要点】:论文通过实验研究了大规模生产物理模拟代码的能耗和功率使用情况,发现实际功率消耗显著低于基于处理器热设计功耗(TDP)的简单模型预测。

方法】:研究使用了商品和技术先进的系统,在劳伦斯利弗莫尔国家实验室(LLNL)和桑迪亚国家实验室进行了一系列实验来测量运行模拟代码时的功率和能量使用情况。

实验】:通过在LLNL和Sandia National Laboratory的系统上运行实验,使用的数据集为LLNL的大规模模拟代码,结果表明这些代码的效率远高于仅基于处理器TDP模型的预测。