Dresden 2017 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: New Accelerator Concepts II
AKBP 2.5: Vortrag
Dienstag, 21. März 2017, 10:30–10:45, MOL 213
Simulations of DLA structures based on FEM in the frequency domain — •Thilo Egenolf1, Uwe Niedermayer1, and Oliver Boine-Frankenheim1,2 — 1TEMF, TU Darmstadt, Schloßgartenstraße 8, 64289 Darmstadt, Germany — 2GSI, Planckstraße 1, 64291 Darmstadt, Germany
Grating structures of a dielectric laser accelerator (DLA) driven by ultrashort laser pulses can reach orders of magnitude larger acceleration gradients than conventional RF electron accelerators. The ratio of energy gain to laser peak amplitude defines the structure constant.
To calculate it, a new field solver based on the finite element method in the frequency domain was implemented. The maximization of the structure constant is presented as a parameter study. Based on the optimized single cell the entire design of a beta-matched grating is completed in an iterative process. The period length increment depends on the velocity of the electron, which increases, when a subrelativistic beam is accelerated. The determination of the optimal period length thus requires the knowledge of the energy gain within all periods passed before.
Furthermore, we outline estimations of the beam loading intensity limit by reversing the solver for the calculation of the beam coupling impedance at optical frequencies.