Dresden 2017 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 1: New Accelerator Concepts I
AKBP 1.6: Talk
Monday, March 20, 2017, 16:15–16:30, MOL 213
Probing of ultra-high contrast laser-plasma interaction from condensed hydrogen jet — •Tim Ziegler1,2, Karl Zeil1, Lieselotte Obst1,2, Martin Rehwald1,2, Florian Brack1,2, Josefine Metzkes1, Stephan Kraft1, Hans-Peter Schlenvoigt1, Sebastian Goede3, Maxence Gauthier3, Christian Roedel3, Chandra Curry3, Siegfried Glenzer3, and Ulrich Schramm1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2TU Dresden, Dresden, Germany — 3SLAC National Accelerator Laboratory, Stanford, United States
To advance the development of laser proton accelerators for highly demanding applications like cancer treatment a stable source of energetic particles at high repetition rates is required. During our last experimental campaign at the Helmholtz-Zentrum Dresden-Rossendorf we therefore employed a pure condensed hydrogen jet as a renewable target for the 100TW Draco laser. Draco is a ultra-high power Ti:Sa laser system which delivers pulses of 30fs and 3J on target at 800nm with a repetition rate of 10Hz. A recollimating single plasma mirror results in an improved temporal contrast represented by an ASE level of 10−13. The expanding jet was monitored on-shot with a separate phase locked diode-pumped ps-laser at a wavelength of 515 nm. By that over-exposure of the CCD resulting from strong plasma self-emission which had been observed in earlier experiments to be at the harmonics of the pump laser, could be avoided. The probe beam was split in two parts oriented perpendicular and parallel with respect to the pump laser axis in order to precisely determine the jet position and its density profile.