TY  - JOUR
AU  - Mayet, F.
AU  - Assmann, R.
AU  - Dorda, U.
AU  - Kuropka, W.
TI  - Using Short Drive Laser Pulses to Achieve Net Focusing Forces in Tailored Dual Grating Dielectric Structures
JO  - Nuclear instruments & methods in physics research / A
VL  - 909
IS  - arXiv:1801.10373
SN  - 0168-9002
CY  - Amsterdam
PB  - North-Holland Publ. Co.
M1  - PUBDB-2019-00297
M1  - arXiv:1801.10373
SP  - 208 - 212
PY  - 2018
N1  - © Elsevier B.V.
AB  - Laser-driven grating type DLA (Dielectric Laser Accelerator) structures have been shown to produce accelerating gradients on the order of GeV/m. In simple β-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.
LB  - PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000451748000046
DO  - DOI:10.1016/j.nima.2018.01.095
UR  - https://bib-pubdb1.desy.de/record/418249
ER  -