Abstract
Due to the tiny apertures of dielectric laser acceleration grating structures within the range of the optical wavelength, wakefields limit the bunch charge for relativistic electrons to a few femtocoulomb. In this paper, we present a wakefield upgrade of our six-dimensional tracking scheme DLAtrack6D in order to analyze these limitations. Simulations with CST Studio Suite provide the wake functions to calculate the kicks within each tracking step. Scaling laws and the dependency of the wake on geometrical changes are calculated. The tracking with wakefields is applied to beam and structure parameters following recently performed and planned experiments. We compare the results to analytical models and identify intensity limits due to the transverse beam breakup and strong head-tail instability. Furthermore, we reconstruct phase advance spectrograms and use them to analyze possible stabilization mechanisms.
Highlights
Dielectric laser acceleration (DLA) structures accelerate electrons in the optical near-fields of periodic gratings [1,2]
The optimization of the beam dynamics in DLA is dominated by the question of how to fit a finite emittance beam into the sub-micrometer apertures of the grating structures over a length of several thousand periods
A scheme to confine a beam in the longitudinal as well as in one transverse plane by alternating the synchronous phase (APF-scheme) was proposed recently [9], wherein we described the single electron dynamics of an accelerator, which is fully scalable in length and energy
Summary
Dielectric laser acceleration (DLA) structures accelerate electrons in the optical near-fields of periodic gratings [1,2]. Previous work on wake effects in DLAs has concentrated on longitudinal effects such as beam loading This has been described by simplified analytical models of the structures, namely an azimuthal symmetrical and longitudinally flat structure and pointlike bunch distributions [10,11,12,13,14,15]. They are intensively studied within the context of driving wakefields in dielectric wakefield accelerators (DWAs) [17,18,19]. In order to analyze intensity effects in arbitrary DLA grating structures, we expand our tracking scheme DLAtrack6D [20] by kicks due to the charge-distribution dependent wake in this paper.
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