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M Börner,
J Fils,
A Frank,
A Blažević,
T Hessling,
A Pelka,
G Schaumann,
A Schökel, D Schumacher,
M M Basko,
J Maruhn,
An Tauschwitz,
M Roth
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ABSTRACT: This article reports on the development and set-up of a Nomarski-type multi-frame interferometer as a time and space resolving diagnostics of the free electron density in laser-generated plasma. The interferometer allows the recording of a series of 4 images within 6 ns of a single laser-plasma interaction. For the setup presented here, the minimal accessible free electron density is 5 × 10(18) cm(-3), the maximal one is 2 × 10(20) cm(-3). Furthermore, it provides a resolution of the electron density in space of 50 μm and in time of 0.5 ns for one image with a customizable magnification in space for each of the 4 images. The electron density was evaluated from the interferograms using an Abel inversion algorithm. The functionality of the system was proven during first experiments and the experimental results are presented and discussed. A ray tracing procedure was realized to verify the interferometry pictures taken. In particular, the experimental results are compared to simulations and show excellent agreement, providing a conclusive picture of the evolution of the electron density distribution.
The Review of scientific instruments 04/2012; 83(4):043501. · 1.52 Impact Factor
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ABSTRACT: At the GSI Helmholtz center for heavy-ion research combined experiments with heavy ions and laser-produced plasmas are investigated. As a preparation to utilize indirectly heated targets, where a converter hohlraum provides thermal radiation to create a more homogeneous plasma, this converter target has to be characterized. In this paper the latest results of these measurements are presented. Small spherical cavities with diameters between 600 and 750 μm were heated with laser energies up to 30 J at 532-nm wavelength. Radiation temperatures could be determined by time-resolved as well as time-integrated diagnostics, and maximum values of up to 35 eV were achieved.
Physical Review E 07/2011; 84(1 Pt 2):016412. · 2.26 Impact Factor
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A Frank,
A Blazević,
P L Grande,
K Harres,
T Hessling,
D H H Hoffmann,
R Knobloch-Maas,
P G Kuznetsov,
F Nürnberg,
A Pelka,
G Schaumann,
G Schiwietz,
A Schökel,
M Schollmeier, D Schumacher,
J Schütrumpf,
V V Vatulin,
O A Vinokurov,
M Roth
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ABSTRACT: The experimental data presented in this paper address the energy loss determination for argon at 4 MeV/u projectile energy in laser-generated carbon plasma covering a huge parameter range in density and temperature. Furthermore, a consistent theoretical description of the projectile charge state evolution via a Monte Carlo code is combined with an improved version of the CasP code that allows us to calculate the contributions to the stopping power of bound and free electrons for each projectile charge state. This approach gets rid of any effective charge description of the stopping power. Comparison of experimental data and theoretical results allows us to judge the influence of different plasma parameters.
Physical Review E 02/2010; 81(2 Pt 2):026401. · 2.26 Impact Factor
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D.H.H. Hoffmann,
N.A. Tahir,
S. Udrea,
O. Rosmej,
C.V. Meister,
D. Varentsov,
M. Roth,
G. Schaumann,
A. Frank,
A. Blazevic,
J. Ling,
A. Hug,
J. Menzel,
Th. Hessling,
K. Harres,
M. Günther,
S. El-Moussati, D. Schumacher,
M. Imran
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ABSTRACT: High intensity particle beams from accelerators induce high energy density states in bulk matter. Due to the specific nature of the ion-matter interaction a volume of matter is heated uniformly with low gradients of temperature and pressure in the initial phase, depending on the pulse structure of the beam with respect to space and time. We present an overview on recent results and developments of beam plasma, and beam matter interaction experiments with heavy ion and laser beams (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Beiträge aus der Plasmaphysik 01/2010; 50(1):7 - 15.
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M Schollmeier,
M Roth,
G Schaumann,
A Blažević,
K Flippo,
A Frank,
J C Fernandez,
D C Gautier,
K Harres,
T Heßling,
B M Hegelich,
F Nürnberg,
A Pelka,
H Ruhl,
J Schreiber, D Schumacher,
K Witte,
B Zielbauer,
D H H Hoffmann
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ABSTRACT: Experiments using high-energy/high-power lasers have being pursued for almost a decade at GSI. In the regime of ultra-intense lasers, the PHELIX (Petawatt High-Energy Laser for heavy-Ion experiments) system has reached the 20 TW level and first successful experiments have been done. In addition to the experiments on heavy-ion energy loss in laser produced plasmas, our research will focus on laser-assisted particle acceleration and the use of high-energy petawatt lasers (HEPW) for the diagnostics of dense plasmas which has raised great interest in the international community. The plasma physics group at GSI, based on experiments in France, the UK and the U.S., has contributed significantly to this field of research in recent years. Now, with the upcoming commissioning of different power levels of PHELIX our experimental activities can be performed at GSI. Due to the funding of a virtual institute by the Helmholtz Association, the opportunities for new experiments at GSI have grown significantly. The paper will give an overview of recent experimental results, show the link to the future GSI experimental program (including FAIR) and present the experiments that will be done at GSI for the years to come.
Journal of Physics Conference Series 06/2008; 112(4):042068.
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A Frank,
A Blazevic,
P.L. Grande,
K Harres,
T. He ling,
D. H. H. Hoffmann,
R. Knobloch Maas,
P.G. Kuznetsov,
F Nürnberg,
A Pelka,
G Schaumann,
G Schiwietz,
A. Schökel,
M Schollmeier, D Schumacher,
J Schütrumpf,
V.V. Vatulin,
O.A. Vinokurov,
M Roth
[show abstract]
[hide abstract]
ABSTRACT: The experimental data presented in this paper address the energy loss determination for argon at 4 MeV u projectile energy in laser generated carbon plasma covering a huge parameter range in density and temperature. Furthermore, a consistent theoretical description of the projectile charge state evolution via a Monte Carlo code is combined with an improved version of the CasP code that allows us to calculate the contributions to the stopping power of bound and free electrons for each projectile charge state. This approach gets rid of any effective charge description of the stopping power. Comparison of experimental data and theoretical results allows us to judge the influence of different plasma parameters
