Frankfurt 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 45: Instrumentierung
HK 45.2: Vortrag
Donnerstag, 20. März 2014, 14:30–14:45, HZ 10
Cluster-jet targets for laser induced ion acceleration — •S. Grieser1, D. Bonaventura1, M. Büscher2, I. Engin3, A.-K. Hergemöller1, E. Köhler1, F. Schlüter2, A. Täschner1, and A. Khoukaz1 — 1Institut für Kernphysik, Westfälische Wilhelms-Universität Münster — 2Peter Grünberg Institut (PGI), FZ Jülich — 3Institut für Kernphysik, (IKP), FZ Jülich
The directed ion acceleration induced by high-energy laser pulses is a strongly increasing research field. In such experiments ultra-short laser pulses focussed on a target create a plasma, in which strong secondary electric fields can accelerate protons and ions to multi-MeV energies. A major drawback of the commonly used targets, like gas-jets or foils, is their low density or the need to be replaced after each laser pulse. An innovative perspective for high-flux and high-repetition-rate experiments is the application of a cluster-jet source, which continuously produces a flux of cryogenic solid clusters by the expansion of pre-cooled gases within fine Laval nozzles. Therefore, a cluster-jet target was built up and set successfully into operation at the University of Münster and will be used for experiments on laser and plasma physics at the University of Düsseldorf. Systematic measurements were done to determine the target beam thickness, possible beam structures, the stability, and the position within the scattering chamber to ensure the ideal requirements for the experiments. For this purpose, the cluster beam was illuminated by a diode laser 33 cm behind the Laval nozzle and observed by a CCD camera. The results on the cluster beam properties will be presented and discussed.