laser加速质子聚焦和能量选择中双极和四极的性能
Performance of solenoids vs. quadrupoles in focusing and energy selection of laser accelerated protons
摘要：
将激光加速质子或离子用于各种应用-例如在粒子治疗或短脉冲射线照相诊断中-需要有效的聚焦和能量选择方法。我们推导出一个分析缩放螺线管的性能相比，作为能量的函数，这是证实了TRACEWIN模拟的双峰/三重峰。缩放表明，在几兆电子伏以上的螺线管需要脉冲或超导，而四极可以保持传统。发现三重态的透射率仅比等效螺线管的透射率低25%。这两种系统同样适合于基于它们的色度效应的能量选择，如使用遵循Yan等人的RPA模拟模型的初始分布所示的\cite{yan2009}。
英文摘要：
Using laser accelerated protons or ions for various applications - for example in particle therapie or short-pulse radiographic diagnostics - requires an effective method of focusing and energy selection. We derive an analytical scaling for the performance of a solenoid compared with a doublet/triplet as function of the energy, which is confirmed by TRACEWIN simulations. The scaling shows that above a few MeV a solenoid needs to be pulsed or super-conducting, whereas the quadrupoles can remain conventional. The transmission of the triplet is found only 25% lower than that of the equivalent solenoid. Both systems are equally suitable for energy selection based on their chromatic effect as is shown using an initial distribution following the RPA simulation model by Yan et al.\cite{yan2009}.
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