Würzburg 2018 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 5: New Accelerator Concepts II

AKBP 5.7: Vortrag

Dienstag, 20. März 2018, 18:00–18:15, NW-Bau - HS2

Optimizing the efficiency of dielectric laser accelerators via the introduction of a distributed Bragg reflector and novel geometries — •Peyman Yousefi, Joshua McNeur, Martin Kozák, Norbert Schönenberger, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 1, 91058 Erlangen

Dielectric laser acceleration (DLA) enables miniaturized particle accelerators in the GeV/m gradient regime with the potential to open new applications from low energy medical irradiation devices to high energy fundamental physics [1]. It is based on the interaction of charged particles with a travelling longitudinal laser-induced near-field excited in the close vicinity of a dielectric nano-structure. Electrons with different energies have been effectively accelerated [2, 3] and studies on phase-controlled staging and focusing have brought this concept closer to its final configuration [4]. To realize longer interaction length over multiple stages, structures that efficiently convert the incoming laser field into the accelerating mode are critical. Here we experimentally present an electron acceleration with a dual pillar silicon grating using a distributed Bragg reflector (DBR). We address the effect of DBR on the acceleration gradient and also report on a new geometry of dual pillars for higher acceleration gradients in sub-relativistic regime.

1.England, R. J.et al. Rev.Mod. Phys. 86, 1337 (2014).

2.Peralta, E. A. et al. Nature 503, 91-94 (2013).

3.Breuer, J., Hommelhoff, P. Phys.Rev. Lett. 111, 134803 (2013).

4.McNeur, J et al., arXiv:1604.07684 [accelerator physics] (2016).