Using short drive laser pulses to achieve net focusing forces in tailored dual grating dielectric structures

Bibliographic Details
Title: Using short drive laser pulses to achieve net focusing forces in tailored dual grating dielectric structures
Authors: Mayet, Frank, Assmann, Ralph, Dorda, Ulrich, Kuropka, Willi
Publication Year: 2018
Collection: Physics (Other)
Subject Terms: Physics - Accelerator Physics
More Details: Laser-driven grating type DLA (Dielectric Laser Accelerator) structures have been shown to produce accelerating gradients on the order of GeV/m. In simple $\beta$-matched grating structures due to the nature of the laser induced steady-state in-channel fields the per period forces on the particles are mostly in longitudinal direction. Even though strong transverse magnetic and electric fields are present, the net focusing effect over one period at maximum energy gain is negligible in the case of relativistic electrons. Stable acceleration of realistic electron beams in a DLA channel however requires the presence of significant net transverse forces. In this work we simulate and study the effect of using the transient temporal shape of short Gaussian drive laser pulses in order to achieve suitable field configurations for potentially stable acceleration of relativistic electrons in the horizontal plane. In order to achieve this, both the laser pulse and the grating geometry are optimized. Simulations conducted with the Particle-In-Cell code VSim 7.2 are shown for both the transient and steady state/long pulse case. Finally we investigate how the drive laser phase dependence of the focusing forces could affect a potential DLA-based focusing lattice.
Comment: EAAC'17 conference proceedings
Document Type: Working Paper
DOI: 10.1016/j.nima.2018.01.095
Access URL: http://arxiv.org/abs/1801.10373
Accession Number: edsarx.1801.10373
Database: arXiv
More Details
DOI:10.1016/j.nima.2018.01.095