Wuppertal 2015 – wissenschaftliches Programm
AKBP 7.7: Vortrag
Dienstag, 10. März 2015, 15:15–15:30, G.10.03 (HS 8)
Guiding of pulsed lasers in plasma waveguides created by a slow capillary discharge — Maximilian Messmer1,2, •Alexander Köhler1,2, Jurjen Couperus1, Axel Jochmann1, Arie Irman1, and Ulrich Schramm1,2 — 1Helmholtz-Zentrum Dresden - Rossendorf — 2Technische Universität Dresden
Laser Wakefield Acceleration (LWFA) has emerged as a promising concept for the next generation of high energy electron accelerators. To attain highest possible particle energies in this acceleration scheme, high intensity lasers must be focused over distances much greater than the Rayleigh length. Hence, laser guiding is necessary to counteract the diffraction induced divergence of the beam.
The guiding of pulsed lasers with intensities up to 2 × 1016 W/cm2 in a plasma waveguides of several centimeter length is shown. A plasma is created within a capillary via the concept of slow capillary discharge. Interferometry shows that the plasma channel has a refractive index profile suitable for laser guiding. Laser guiding capabilities of a pulsed Ti:Sa laser are evaluated. The results show a broad, easy to realize parameter window for pressure and time in which high transmission above 75% are achieved.