Wuppertal 2015 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 7: PWA / TNSA II
AKBP 7.8: Vortrag
Dienstag, 10. März 2015, 15:30–15:45, G.10.03 (HS 8)
Concept for Continuous Gas Flow Operation of a LWFA-Target — •Niels Matthias Delbos1,2, Dariusz Kocon1,2,3, Philipp Messner1,2, Paul Pourmoussavi1,2, Christian Markus Werle1,2, Benno Zeitler1,2, and Andreas R. Maier1,2 — 1CFEL, Center for Free-Electron Laser Science, 22607 Hamburg — 2University of Hamburg, Institute of Experimental Physics, 22761 Hamburg — 3ELI Beamlines, 18221 Praha 8, Czech Republic
Stable operation of the plasma-target for Laser Wakefield Acceleration (LWFA) is a key element for reliable, accessible and reproducible experiments. Most LWFA experiments rely on targets, which are operated with short bursts of gas, as the vacuum system is not capable of handling higher gas loads. After each pulse of gas, the vacuum system needs a considerable amount of time to reduce the pressure to a low enough level for the next laser-shot, which is still the highest limiting constraint in electron shot-to-shot repetition rate of the whole accelerating system. In contrast to a pulsed gas operation, this talk will show a concept to be implemented at the LUX-Beam Line, operated by a collaboration of University of Hamburg and DESY, that allows for continuous flow operation of the target and thus highest electron repetition rates, only limited by the repetition rate of the laser. Furthermore, continuous gas flow operation mitigates possible error sources from pressure fluctuations inside the target and timing jitter between laser pulse and gas pulse. The concept features a differential pumping setup, specially designed for laser applications, as well as a gas supply system and an online pressure measurement inside the target.