Hannover 2010 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 14: Miscellaneous
P 14.4: Vortrag
Mittwoch, 10. März 2010, 17:15–17:30, B 302
Water micro droplets for generation of mono energetic — •Jens Polz1,2, Sven Herzer1,2, Wolfgang Ziegler1,2, Oliver Jäckel1,2, and Malte Kaluza1,2 — 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, 07743 Jena, Germany — 2Helmholtz Institut Jena, Friedrich-Schiller-Universität, 07743 Jena, Germany
Laser ion acceleration with Tera- and Petawatt class lasers has been studied for more than a decade. The dominant acceleration mechanism is target normal sheath acceleration. The maximum achievable ion energy is limited by the laser and the obtained energy spectra show a quasi-thermal distribution. It is highly desirable to increase the maximum ion energies and to be able to spectrally shape the energy distribution of the accelerated ions.
Using micro droplet targets provides us with the unique advantage of combining mass limitation corresponding to a field strength enhancement and spectral shaping making use of the confined TNSA process. Charge separation effects in the expanding ion beam containing at least two ion species enable the formation of non-thermal features in the spectrum.
The experiment presented here shows that water micro droplet targets can be used to generate spectrally modulated ion beams with increased maximum energy. In contrast to previous experiments, we were able to obtain non thermal energy spectra with a reliability increased to more than 50%.