Simulations of an energy dechirper based on dielectric lined waveguides

Y. Nie, G. Xia, T. Pacey

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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 3.0μm, 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.

    Keywords

    • Dielectric wakefield accelerator
    • Energy spread dechirper
    • Ultra-short electron bunch

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