Dresden 2013 – scientific programme
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T: Fachverband Teilchenphysik
T 129: Beschleunigerphysik XVI (Poster)
T 129.30: Poster
Wednesday, March 6, 2013, 16:45–19:00, HSZ 1.OG
Hollow Beam creation with diffractive phase masks at PHELIX — •Christian Brabetz1, Simon Busold2, Oliver Deppert2, Oliver Kester1,2, Dennis Schumacher3, Florian Wagner2, Bernhard Zielbauer3, and Vincent Bagnoud3 — 1Goethe-Universität Frankfurt, Senckenberganlage 31, 60325 Frankfurt am Main, Germany — 2Technische Universität Darmstadt, Karolinenplatz 5, 64289 Darmstadt, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt , Germany
In the framework of the Laser Ion Generation Handling and Transport (LIGHT) research project at GSI, the reduction of the divergence of the laser accelerated ions is a central issue. One solution resides on engineering the electron sheath using in TNSA for reducing the initial divergence of the ion beam. In our first attempt, we were successful in creating and propagating a *donut* laser mode at the PHELIX laser. We have then conducted a experimental campaign at PHELIX
One sees a qualitative effect of the focal spot beam shape on the ion beam divergence as expected.
The energy cut-off in the proton spectrum was nearly higher when a donut focus was applied, although this resulted in contradiction with the intensity scaling law of TNSA.