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Sep 13 – 19, 2015
La Biodola, Isola d'Elba
Europe/Rome timezone

High-repetition-rate laser-proton acceleration employing a cryogenic Hydrogen jet as a target

Sep 14, 2015, 4:45 PM
20m
SB1 Sala Bonaparte 1 (Hotel Hermitage)

SB1 Sala Bonaparte 1

Hotel Hermitage

talk WG2 - Ion beams from plasmas WG2 - Ion beams from plasmas

Speaker

Martin Rehwald (Helmholtz-Zentrum Dresden-Rossendorf)

Description

Applications of laser-accelerated protons demand a stable, high-energy and high-repetition rate particle source. We present the results of our experimental campaign in cooperation with the HED group at SLAC, performed at the 10 Hz Ti:Sa laser Draco of Helmholtz-Zentrum Dresden-Rossendorf (HZDR), employing a cryogenic Hydrogen jet as a renewable target. Draco delivers pulses of 30 fs and 5 J at 800 nm, focussed to a 3 µm spot by a F/2.5 off-axis parabolic mirror. The cylindrical jet has a diameter of 2 µm or 5 µm and a nominal electron density of 30 times the critical density. Preliminary results show a mono-species proton acceleration in a solid angle of at least +/-45° with respect to the incoming laser beam and proton energies exceeding 10 MeV. Radiochromic film stacks in forward direction show signatures of two acceleration mechanisms, one being the conventional TNSA and a second one leading to filament-like structures, possibly stemming from an instability within the plasma. Among other results, an on-shot monitoring of the stability of the jet by means of a temporally synchronized probe beam will be shown in the presentation.

Primary author

Mrs Lieselotte Obst (Helmholtz-Zentrum Dresden-Rossendorf)

Co-authors

Dr Christian Rödel (SLAC National Accelerator Laboratory) Florian-Emanuel Brack (Helmholtz-Zentrum Dresden-Rossendorf) Dr Hans-Peter Schlenvoigt (Helmholtz-Zentrum Dresden-Rossendorf) Josefine Metzkes (Helmholtz-Zentrum Dresden-Rossendorf) Dr Karl Zeil (Helmholtz-Zentrum Dresden-Rossendorf) Martin Rehwald (Helmholtz-Zentrum Dresden-Rossendorf) Dr Maxence Gauthier (SLAC National Accelerator Laboratory) Michael MacDonald (SLAC National Accelerator Laboratory) Philipp Sommer (Helmholtz-Zentrum Dresden-Rossendorf) Dr Sebastian Göde (SLAC National Accelerator Laboratory) Dr Siegfried Glenzer (SLAC National Accelerator Laboratory) Prof. Ulrich Schramm (Helmholtz-Zentrum Dresden-Rossendorf) Dr William Schumaker (SLAC National Accelerator Laboratory)

Presentation materials

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