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P: Plasmaphysik

P 9: Schwerionen- und lasererzeugte Plasmen 1

P 9.3: Vortrag

Samstag, 5. März 2005, 09:15–09:30, HU 3059

Isochoric heating of low Z solid targets with 10 fs laser pulses — •Jens Osterholz¹, Thomas Fischer¹, Felix Brandl¹, Mirela Cerchez¹, Ariane Pipahl¹, Georg Pretzler¹, Oswald Willi¹, and Steven Rose² — ¹Heinrich-Heine-Universitaet Düsseldorf — ²University of Oxford

The investigation of high density plasmas plays an important role for astrophysics, inertial confinement fusion and x-ray lasers. Therefore the generation of dense plasmas with ultra-intense laser pulses is a field of enormous topical interest. An upper limit of the maximum plasma density that can be achieved with this method, however, occurs due to the formation of a preplasma and the expansion of the plasma during the interaction. Here we describe a novel approach that is based on a laser system that generates 10 fs pulses with a low prepulse energy. Isochoric heating is demonstrated with small Z solid targets. Time integrated XUV spectroscopy is used to investigate the emission from the plasma. The series limits observed in the spectra are explained by pressure ionisation. The XUV spectra were simulated by two different models. The first calculates the effect of pressure ionisation and the second calculates the line intensity ratios. Preliminary calculations suggest that the plasma density of the emitting region is close to solid density with an electron temperature of about 100eV.