M. Kulish

Shockwave-driven, non-ideal plasmas for interaction experiments with heavy-ion beams

Plasma targets for measuring energy loss and charge-state distribution of heavy ions in non-ideal plasmas have been developed. Ar plasmas with Γ-parameters 0.55–1.5 could be realized and the interaction with several ion species studied. Here, the results for 5.9 MeV/u C ions are presented. The energy loss in plasma was reproduced in different experiments.

Electrical resistivity measurements of heavy ion beam generated high energy density aluminium

The high intensity heavy ion beams provided by the accelerator facilities of the Gesellschaft fur Schwerionenforschung (GSI) Darmstadt are an excellent tool to produce large volumes of high energy density (HED) matter. Thermophysical and transport properties of HED matter states are of interest for fundamental as well as for applied research. In this paper we present the most recent results on electrical resistivity of HED matter obtained at the High Temperature Laboratory of the Plasma Physics Department of GSI. The targets under investigation consisted of 5 mm long and 0.25 mm diameter aluminium wires. Uranium beam pulses with durations of approximately 200 ns, intensities of about 2 × 109 ions/bunch and an initial ion energy of 350 A MeV have been used as a driver. An energy density deposition of about 1 kJ g−1 has been achieved by focussing the ion beam to less than 1 mm FWHM. Under these conditions, resistivities of up to 1.5 × 10−6 Ω m have been observed within 1 µs after irradiation.

Design, development, and testing of non-intercepting profile diagnostics for intense heavy ion beams using a capacitive pickup and beam induced gas fluorescence monitors

An intense and focused heavy ion beam is a suitable tool to generate high energy density in matter. To compare results with simulations it is essential to know beam parameters as intensity, longitudinal, and transversal profile at the focal plane. Since the beams energy deposition will melt and evaporate even tungsten, non-intercepting diagnostics are required. Therefore a capacitive pickup with high resolution in both time and space was designed, built and tested at the high temperature experimental area at GSI. Additionally a beam induced fluorescence monitor was investigated for the synchrotrons (SIS-18) energy-regime (60–750 AMeV) and successfully tested in a beam-transfer-line.

Explosively Driven Dense Plasma Targets for the Ion Beam Experiments

Possibilities of the explosively driven technique to generate dense plasma targets for the ion beam experiments are discussed.

Overview of warm-dense-matter experiments with intense heavy ion beams at gsi-darmstadt

This paper presents an overview of the warm-dense-matter physics experiments with intense heavy ion beams that has been carried out at the Gesellschaft fur Schwerionenforschung (GSI), Darmstadt, Germany. These experiments are a joint effort of GSI-Darmstadt, TU-Darmstadt, ITEP-Moscow, IPCP-Chernogolvka and LBNL-Berkeley. In the performed experiments, electron-cooled beam of 238U73+ ions with initial ion energy of 350 AMeV has been used. The intense, up to 2.5 - 109 ions/bunch, ion pulses have been compressed to 110 ns (FWHM) and focused at the target to a spot down to 150 mum diameter. The beam intensity and the pulse shape have been measured by current transformers installed in front of the target chamber whereas the upper limit for the focal spot size has been determined by recording beam-induced emission of argon gas at ionic spectral lines. It was shown that using intense heavy ion beam that is presently available at GSI and employing the HIHEX beam-target design concept, it is possible to investigate basic thermodynamic and transport properties of HED metal states in the two-phase liquid-gas region and near the critical point.

OPTICAL PROPERTIES OF DENSE PLASMA IN SHOCK AND RAREFACTION WAVES

Results of the experiments on measurements of optical properties of strongly coupled hot plasmas are presented. The fast optical pyrometry enabled us to obtain information on the thermodynamic and optical properties of condensed matter in the supercritical region of parameters and in the vicinity of the saturation curve. The experimental information is compared with the wide-range semiempirical equation of states and optical models of plasma.