High Power Laser Science and Engineering, 2020, 8 (2): 02000e24, Published Online: Jun. 23, 2020  

Enhancement of the laser-driven proton source at PHELIX

Author Affiliations
1 GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstra?e 1, 64291 Darmstadt, Germany
2 GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstra?e 1, 64291 Darmstadt, Germany
3 GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstra?e 1, 64291 Darmstadt, Germany
4 GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstra?e 1, 64291 Darmstadt, Germany
5 GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstra?e 1, 64291 Darmstadt, Germany
6 Friedrich-Schiller-Universit?t, Fürstengraben 1, 07743 Jena, Germany
Abstract
We present a study of laser-driven ion acceleration with micrometre and sub-micrometre thick targets, which focuses on the enhancement of the maximum proton energy and the total number of accelerated particles at the PHELIX facility. Using laser pulses with a nanosecond temporal contrast of up to $10^{-12}$ and an intensity of the order of $10^{20}~\text{W}/\text{cm}^{2}$, proton energies up to 93 MeV are achieved. Additionally, the conversion efficiency at $45^{\circ }$ incidence angle was increased when changing the laser polarization to p, enabling similar proton energies and particle numbers as in the case of normal incidence and s-polarization, but reducing the debris on the last focusing optic.

J. Hornung, Y. Zobus, P. Boller, C. Brabetz, U. Eisenbarth, T. Kühl, Zs. Major, J. B. Ohland, M. Zepf, B. Zielbauer, V. Bagnoud. Enhancement of the laser-driven proton source at PHELIX[J]. High Power Laser Science and Engineering, 2020, 8(2): 02000e24.

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