Acceleration of relativistic beams using laser-generated terahertz pulses
Acceleration of relativistic beams using laser-generated terahertz pulses
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DOI：
10.1038/s41566-020-0674-1
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发表时间：
2020-08-10
期刊：
影响因子：
35
通讯作者：
Jamison, Steven P.
中科院分区：
文献类型：
--
作者：
Hibberd, Morgan T.;Healy, Alisa L.;Jamison, Steven P.
电荷为 60 pC 的相对论 35 MeV 电子束在太赫兹波驱动的介质波导中加速。当太赫兹脉冲能量为0.8 μJ时，可实现2 MeV m(-1)的加速梯度和10 keV的能量增益。与传统射频技术相比，激光产生的太赫兹（THz）脉冲驱动的粒子加速器有望对粒子束的能量时间相空间进行前所未有的控制。在这里，我们演示了太赫兹驱动的线性加速器中相对论电子束的加速。窄带太赫兹脉冲被调谐到矩形电介质衬里波导的相速度匹配工作频率，以与 35 MeV、60 pC 电子束团扩展共线相互作用，向啁啾 (6 ps) 电子束团提供多周期能量调制，并向子周期 (2 ps) 电子束团注入相位相关的能量增益（高达 10 keV）。这些原理验证结果建立了亚皮秒粒子束全束线性加速的途径，直接适用于能够保持光束质量的放大和多级概念，从而标志着未来太赫兹驱动的相对论光束加速的一个重要里程碑。
Relativistic 35 MeV electron bunches with charges of 60 pC are accelerated in a terahertz-wave-driven dielectric waveguide. When the terahertz pulse energy is 0.8 mu J, an accelerating gradient of 2 MeV m(-1)and energy gain of 10 keV are achieved.Particle accelerators driven by laser-generated terahertz (THz) pulses promise unprecedented control over the energy-time phase space of particle bunches compared with conventional radiofrequency technology. Here we demonstrate acceleration of a relativistic electron beam in a THz-driven linear accelerator. Narrowband THz pulses were tuned to the phase-velocity-matched operating frequency of a rectangular dielectric-lined waveguide for extended collinear interaction with 35 MeV, 60 pC electron bunches, imparting multicycle energy modulation to chirped (6 ps) bunches and injection phase-dependent energy gain (up to 10 keV) to subcycle (2 ps) bunches. These proof-of-principle results establish a route to whole-bunch linear acceleration of subpicosecond particle beams, directly applicable to scaled-up and multistaged concepts capable of preserving beam quality, thus marking a key milestone for future THz-driven acceleration of relativistic beams.