Wuppertal 2015 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 7: PWA / TNSA II
AKBP 7.2: Talk
Tuesday, March 10, 2015, 14:00–14:15, G.10.03 (HS 8)
Few-cycle optical probe-pulses: Diagnosing Laser Wakefield Accelerators — •Daniel Ullmann1, Matthew Schwab2, Stephan Kuschel1, Mark Yeung1,3, Alexander Sävert2, Matt Zepf1,3, and Malte C. Kaluza1,2 — 1Helmholtz-Institut Jena, Friedrich-Schiller-Universität, 07743 Jena, Germany — 2Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, 07743 Jena, Germany — 3Department of Physics and Astronomy, Queens University Belfast, BT7 1NN Belfast, United Kingdom
Several applications of a few-cycle optical probe-pulse (fc-probe pulses) in Laser Wakefield Acceleration (LWFA) experiments on the JETI 40 TW laser system in Jena will be described. These investigations are motivated by the need for high-resolution diagnostics of the wakefield to gain a deeper insight into the physics underlying the acceleration process and to benchmark numerical simulations which have so far been the only source for detailed information.
Various measurements using the fc-probe pulses were performed during a LWFA experimental campaign. Here, a gas-cell filled with a 95:5 Helium:Nitrogen mixture was used as the target material. Interferometric measurements of the electron plasma density were done and compared using both a Mach-Zehnder interferometer and a polychromatic wavefront sensor. Further measurements implementing the relationship between spectral bandwidth and temporal resolution of the fc-probe pulses were performed as an investigation into multi-frame, single-shot shadowgraphic techniques.