THz-driven multi-stage relativistic beamline design and beam dynamics

太赫兹驱动的非相对论和相对论粒子束的加速和操纵正迅速发展到驱动新加速器方法的中心阶段。在Cockcroft研究所（由CI核心和配额博士生支持），我们在介电衬里波导中进行了第一个原理证明太赫兹驱动的相速度匹配相互作用，加速度高达10 keV。在最近的CLARA运行中，我们展示了[2]记录的太赫兹驱动的相对论性35.5 MeV， 20-100 pC电子束的线性加速，以及对束的高级操作，以显示微束产生所需的解啁啾和调制。同时，我们已经展示了如何在MeV状态下使用链波导来保持分级加速器[3]中的束质量。我们也在探索非相对论光束，在达斯伯里实验室的一个专门建造的地堡里，围绕着我们的100千电子伏的非相对论实验装置，最近展示了使用太赫兹驱动结构的电子束偏转，在那里我们观察到电子束在屏幕上的条纹。我们现在的目标是证明加速到MeV的光束能量可以通过太赫兹加速来实现，光束控制可以通过同步太赫兹压缩来实现。我们的工作进展迅速，但现在我们需要证明这些进步的能力，以提供更长的光束线，从而实现更大的能量设施，并解决使用多阶段太赫兹驱动结构将出现的光束相关问题。目前，这是一个未解决的问题，因为没有光束线设计存在，将耦合多个结构，同时在加速过程中保持光束质量，这个项目的学生将开发第一个完整的太赫兹- dla完整设施设计。该学生将在太赫兹掩体上测试光束线概念，使用100 keV源，我们很快将在达斯伯里实验室进行调试。

Terahertz-driven acceleration and manipulation of non-relativistic and relativistic particle beams is rapidly evolving to centre-stage in the drive to novel accelerator methods. In the Cockcroft Institute (and supported by CI core and quota PhD students) we performed [1] the first proof-of-principle THz- driven phase-velocity-matched interaction in a dielectric-lined waveguide, with acceleration up to 10 keV. In the most recent CLARA run we demonstrated [2] record THz-driven linear acceleration of relativistic 35.5 MeV, 20-100 pC electron beams, and advanced manipulation of the bunch to show de- chirping and the modulation necessary for the generation of micro-bunches. In parallel we have shown how chained waveguides in the MeV regime can be used to maintain bunch quality in staged accelerator [3]. We are also exploring non-relativistic beams, focused around our 100 keV non-relativistic experimental rig in a purpose-built bunker at Daresbury Laboratory and recently demonstrated electron bunch deflection using THz-driven structures, where we observe the streaking on the screen of electron bunches. We are now aiming to demonstrate that acceleration to MeV beam energies can be achieved with THz acceleration, and beam control can be achieved with synchronised THz compression. Our work is showing rapid progress but now we need to demonstrate the capability of these advances to deliver a longer beamline and hence a larger energy facility, and solve the beam-related problems that using multi-staged THz-driven structures will present. Currently, this is an unsolved problem as no beamline design exists that will couple multiple structures whilst preserving beam quality during acceleration, and the student on this project will develop the first complete THz-DLA complete facility design. The student will test the beamline concepts on the THz bunker, using a 100 keV source, that we are commissioning soon at Daresbury Laboratory.