Darmstadt 2016 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 15: PWA and self modulation

AKBP 15.8: Vortrag

Donnerstag, 17. März 2016, 18:15–18:30, S1/05 24

High-repetition-rate laser-proton acceleration from a condensed hydrogen jet — •Lieselotte Obst¹, Karl Zeil¹, Sebastian Göde², Josefine Metzkes¹, Hans-Peter Schlenvoigt¹, Maxence Gauthier², Martin Rehwald¹, Christian Rödel², Philipp Sommer¹, Michael MacDonald², Florian Brack¹, William Schumaker², Ulrich Schramm¹, and Siegfried Glenzer² — ¹Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany — ²SLAC National Accelerator Laboratory, Stanford, USA

Applications of laser-accelerated protons demand a stable source of energetic particles at high repetition rates. We present the results of our experimental campaign in cooperation with MEC/SLAC at the 10Hz Ti:Sa laser Draco of Helmholtz-Zentrum Dresden-Rossendorf (HZDR), employing a pure condensed hydrogen jet as a renewable target. Draco delivers pulses of 30 fs and 5 J at 800 nm, focused to a 3 µm spot by an F/2.5 off-axis parabolic mirror. The jet’s nominal electron density is approximately 30 times the critical density and its thickness is 2 µm, 5 µm or 10 µm, depending on the applied aperture on the source. Ion diagnostics reveal mono-species proton acceleration in a solid angle of at least +/-45^∘ with respect to the incoming laser beam, with maximum energies of around 5 MeV. The expanding jet could be monitored on-shot with a temporally synchronized probe beam perpendicular to the pump laser axis. Recorded probe images resemble those of z-pinch experiments with metal wires and indicate an m=0 instability in the plasma.