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BE: Beschleunigerphysik

BE 3: New Accelerator Concepts

BE 3.6: Hauptvortrag

Dienstag, 1. April 2014, 11:15–11:45, MOL 213

Laser acceleration of electrons at a dielectric grating structure — •Peter Hommelhoff — Physikdepartment, Friedrich-Alexander-Universität Erlangen-Nürnberg und MPI f. Quantenoptik, Garching

In free space acceleration of charged massive particles with alternating (optical) fields works only over distances as small as the driving wavelength, or is inefficient (higher order effects). However, with proper boundary conditions the acceleration with alternating fields can become efficient, over infinite distances. We will present results on the acceleration of electrons with the optical electric field of 800-nm 100-fs laser pulses at a dielectric grating structure. We employ the third spatial harmonic (grating period of 750nm) to accelerate non-relativistic 30-keV electrons and observe an acceleration gradient of up to 25 MeV/m, already matching the gradient of nowadays large-scale accelerators. With similar laser parameters and relativistic electrons the acceleration becomes more efficient and translates into a gradient of 1 GeV/m. We will present experimental and simulation results as well as an extended outlook on dielectric laser acceleration and manipulation of charged particles, including a discussion of the required ultra-low emittance electron beam properties.