Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Instrumentation IV
HK 21.2: Talk
Tuesday, March 31, 2020, 17:30–17:45, J-HS D
Studies on proton acceleration via laser-cluster interaction — •Lukas Leßmann1, Bastian Aurand2, Christian Mannweiler1, Kerstin Maria Schwind2, Oswald Willi2, and Alfons Khoukaz1 — 1Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany — 2Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, 40223 Düsseldorf, Germany
The CryoFlash experiment investigates the interaction of the high intensity, short-pulse Ti:Sa laser of the Arcturus Facility Düsseldorf with a cryogenic cluster-jet target constructed at the WWU Münster. A cluster-jet target provides a continuous flow of nanometer sized particles of approximately solid density by pressing pre-cooled gas or liquid through a very narrow Laval nozzle. This combines the advantages of gas-jet targets (continuous flow) and solid targets (local high density) for an operation at high laser repetition rates with a single-species and debris-free acceleration scheme.
The electric field of the incoming laser ionises the atoms and accelerates the electrons out of the clusters in a few laser cycles. The remaining proton clusters undergo coulomb explosions resulting in proton energies of a few hundred keV. The measured proton spectra show very little shot-to-shot fluctuations and the maximal energy can easily be tuned with the target parameters.
Measurements taken with two Thomson parabola spectrometers in summer 2019 will be presented and discussed.
This project has received funding from BMBF (05K16PM3).