Anomalous Beam Transport through Gabor (Plasma) Lens Prototype
Anomalous Beam Transport through Gabor (Plasma) Lens Prototype
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DOI：
10.3390/app11104357
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
T. Nonnenmacher;T. Dascalu;R. Bingham;C. Cheung;H. Lau;K. Long;J. Pozimski;C. Whyte
中科院分区：
文献类型：
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作者：
T. Nonnenmacher;T. Dascalu;R. Bingham;C. Cheung;H. Lau;K. Long;J. Pozimski;C. Whyte
电子等离子体透镜是一种经济高效、紧凑、强聚焦的元件，可以确保有效捕获来自激光驱动源的低能质子和离子束。伦敦帝国理工学院为高电子密度操作构建了 Gabor 透镜原型。这里报告了 1.4 MeV 质子束流测试期间透镜稳定工作状态的参数及其性能。窄笔形光束在透镜下游 67 厘米处的闪烁体屏幕上成像。透镜将笔形光束转换为环，这些环显示位置相关的形状和强度调制，这些形状和强度调制取决于透镜的设置。聚焦效应的表征表明，等离子体柱表现出类似于 m=1 双子管不稳定性的离轴旋转。使用粒子跟踪模拟研究了不稳定性与环原因的关联。
An electron plasma lens is a cost-effective, compact, strong-focusing element that can ensure efficient capture of low-energy proton and ion beams from laser-driven sources. A Gabor lens prototype was built for high electron density operation at Imperial College London. The parameters of the stable operation regime of the lens and its performance during a beam test with 1.4 MeV protons are reported here. Narrow pencil beams were imaged on a scintillator screen 67 cm downstream of the lens. The lens converted the pencil beams into rings that show position-dependent shape and intensity modulation that are dependent on the settings of the lens. Characterisation of the focusing effect suggests that the plasma column exhibited an off-axis rotation similar to the m=1 diocotron instability. The association of the instability with the cause of the rings was investigated using particle tracking simulations.