Berlin 2005 – scientific programme
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SYLP: Relativistische Laser-Plasma-Physik
SYLP 3: Poster zum Symposium Relativistische Laser-Plasma-Physik
SYLP 3.4: Poster
Saturday, March 5, 2005, 10:00–17:00, HU Senatssaal
Acceleration of electrons and protons from thin foils — •K.U. Amthor1, B. Liesfeld1, F. Ewald1, H. Schwoerer1, R. Sauerbrey1, F. Hannachi2, J.F. Chemin2, T. Zagar3, J. Magill3, and K.W.D. Ledingham4 — 1IOQ, Jena — 2CENBG, Bordeaux — 3ITU, Karlsruhe — 4Strathclyde, Glasgow
Electron and proton beams were investigated using the Jena Multi-TW-Laser of 80 fs pulse duration with intensities up to about 2 × 1019 W/cm2 irradiating thin foil targets.
The electrons interacted with a scintillating screen and were found to be directed along target normal and also along the direction of the laser beam. It would appear that at these intensities there is evidence that both resonant absorption and ponderomotive accelerating mechanisms are present. As the laser intensity increased the number of electrons in the normal component remained relatively unchanged whereas the number of electrons in the laser direction increased. It was found that the angle between the two beams was largely independent of laser intensity and lay close to the laser beam direction.
The proton beam behind the target was directed along target normal with an opening half angle of about 8∘ for protons > 3.2 MeV and 15∘ for protons > 2.5 MeV. The maximum energy of the protons was < 5 MeV characteristic of a laser interaction at this intensity and pulse width with thin targets. To determine the proton energy as well as their emission angle a spectrometer has been developed consisting of a multi layered filter in combination with nuclear track detectors.