Düsseldorf 2007 – scientific programme
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SYRL: Symposium Relativistische Laserplasmen
SYRL 2: Relativistische Laserplasmen
SYRL 2.1: Invited Talk
Friday, March 23, 2007, 14:00–14:30, 6C
Ultrafast proton acceleration in relativistic laser plasma — •Peter Nickles1, Matthias Schnürer1, Thomas Sokollik1, Sargis Ter Avetisyan1, Wolfgang Sandner1, Munib Amin2, Toma Toncian2, and Oswald Willi2 — 1Max-Born-Institut, Berlin, Germany — 2Heinrich- Heine- Universität, Düsseldorf, Germany
We report on detailed investigations of ultrashort (~ 40 fs,above 10E19 W/cm2) laser pulse driven ion acceleration from solid targets using sensitive single-shot particle diagnostic. Time- and spatially resolved ion/proton energy spectra and distributions, efficiencies in dependence on the laser pulse parameters such as pulse duration, intensity, and contrast ratio were studied and acceleration scenarios are discussed. The recorded distributions show that preferentially lower energetic protons/ions (<1MeV) have a wiggled structure, whereas protons with higher energy have an undisturbed "continuous" distribution, witnessing of a fixed source size. Among the generation and characterization of laser driven ions/protons, the search for quasi-monoenergetic ions plays an outstanding role. Results to this topic showing bunches of "mono-energetic" deuterons about 2 MeV are given.
Furthermore we report on first "streaked" deflectometry of the development of fields at the rear side of a secondary plasma. Comparing this measurements of the temporal and 1D-spatial development and complimentary two-dimensional spatial snapshots with ray tracing calculations we inferred the scenario of an expanding field at the target rear side due to charge-up, charge compensation and ion front propagation processes.