Control of quasi-monoenergetic electron beams from laser-plasma accelerators with adjustable shock density profile
Control of quasi-monoenergetic electron beams from laser-plasma accelerators with adjustable shock density profile
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DOI：
10.1063/1.5023694
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发表时间：
2018-04-01
影响因子：
2.2
通讯作者：
Leemans, Wim
中科院分区：
文献类型：
--
作者：
Tsai, Hai-En;Swanson, Kelly K.;Leemans, Wim
对激波诱导密度下降注入器的注入物理进行了表征，展示了激光-等离子体加速器(LPA)的精确控制。利用一个喷流叶片组件，实验系统地改变了激波喷射器的外形，包括激波角度、激波位置、上坡道宽度和加速长度。我们的工作表明，可以通过调整这些参数来控制束流能量、能量扩散和指向。结果得到了能散8%、发散1.5mrad、指向起伏0.35mrad、能量分布在25~300 MeV范围内高度可调的电子束。粒子模拟表征了冲击角和上斜面宽度的变化对喷射过程的影响。这种高度可控的LPA是一种适合于汤姆逊源和自由电子激光等LPA应用的紧凑电子束光源。由AIP出版公司出版。
The injection physics in a shock-induced density down-ramp injector was characterized, demonstrating precise control of a laser-plasma accelerator (LPA). Using a jet-blade assembly, experiments systematically varied the shock injector profile, including shock angle, shock position, up-ramp width, and acceleration length. Our work demonstrates that beam energy, energy spread, and pointing can be controlled by adjusting these parameters. As a result, an electron beam that was highly tunable from 25 to 300MeV with 8% energy spread (DEFWHM/E), 1.5 mrad divergence, and 0.35 mrad pointing fluctuation was produced. Particle-in-cell simulation characterized how variation in the shock angle and up-ramp width impacted the injection process. This highly controllable LPA represents a suitable, compact electron beam source for LPA applications such as Thomson sources and free-electron lasers. Published by AIP Publishing.