论文标题
强烈离子束的五维相空间分布的测量
Measurements of the five-dimensional phase space distribution of an intense ion beam
论文作者
论文摘要
在梁光环的水平上，没有对强束传输的模拟进行准确的测量。这种差异的一种潜在解释是缺乏对六维（6D）〜相空间中颗粒初始分布的了解。最近在散布中子源（SNS）梁测试设施（BTF）上进行了对离子束的直接6D测量，揭示了影响下游进化的光束芯中的非线性横向纵向相关性。不幸的是，直接6D〜测量在分辨率和动态范围内受到限制。在这里，我们讨论了三个缝隙和一个屏幕的使用来测量6D相空间分布的5D投影，以一维成本克服这些限制。我们检查通过BTF运输前后测得的5D分布，并与粒子中的模拟进行比较。我们还讨论了从5D和4D预测重建6D分布的可能性。
No simulation of intense beam transport has accurately reproduced measurements at the level of beam halo. One potential explanation of this discrepancy is a lack of knowledge of the initial distribution of particles in six-dimensional (6D)~phase space. A direct 6D measurement of an ion beam was recently performed at the Spallation Neutron Source (SNS) Beam Test Facility (BTF), revealing nonlinear transverse-longitudinal correlations in the beam core that affect downstream evolution. Unfortunately, direct 6D~measurements are limited in resolution and dynamic range; here, we discuss the use of three slits and one screen to measure a 5D projection of the 6D phase space distribution, overcoming these limitations at the cost of one dimension. We examine the measured 5D distribution before and after transport through the BTF and compare to particle-in-cell simulations. We also discuss the possibility of reconstructing the 6D distribution from 5D and 4D projections.
