Simulations of an energy dechirper based on dielectric lined waveguides
Simulations of an energy dechirper based on dielectric lined waveguides
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DOI：
10.1016/j.nima.2017.11.050
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
Y. Nie;G. Xia;T. Pacey
中科院分区：
文献类型：
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作者：
Y. Nie;G. Xia;T. Pacey
太赫兹频率尾场可以由穿过介质衬里波导（DLW）结构的超短相对论电子束激发。这些尾场可以以高梯度加速见证束，或者调节驱动束的能量。在本文中，我们研究了一种基于 DLW 的无源解线性调频器，以补偿由激光等离子体尾场加速器 (LWFA) 加速的束团的相关能量扩散。采用矩形波导结构，利用其在操作过程中连续可调的间隙。假设的 200 MeV 驱动束团具有高斯分布，束团长度为 3. 0 μm，相对相关能展为 1%，总电荷为 10 pC。 CST Wakefield Solver 和 PIC Solver 都用于模拟和优化此类去线性调频器。从能量调制和横向相空间的角度分析了瞬态自尾流对驱动束团的影响。
Terahertz frequency wakefields can be excited by ultra-short relativistic electron bunches travelling through dielectric lined waveguide (DLW) structures. These wakefields can either accelerate a witness bunch with high gradient, or modulate the energy of the driving bunch. In this paper, we study a passive dechirper based on the DLW to compensate the correlated energy spread of the bunches accelerated by the laser plasma wakefield accelerator (LWFA). A rectangular waveguide structure was employed taking advantage of its continuously tunable gap during operation. The assumed 200 MeV driving bunch had a Gaussian distribution with a bunch length of 3. 0 μ m, a relative correlated energy spread of 1%, and a total charge of 10 pC. Both of the CST Wakefield Solver and PIC Solver were used to simulate and optimize such a dechirper. Effect of the time-dependent self-wake on the driving bunch was analysed in terms of the energy modulation and the transverse phase space.