N. S. Shilkin

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.

ITEP proton microscopy facility

The proton radiography facility which uses magnetic optics (proton microscope PUMA [7]) was developed at TWAC-ITEP accelerator [1,2,6]. PUMA proton microscopy facility was specially designed for studies in the field of high energy density physics, including the research of equations of state and phase transitions of matter at extreme conditions, shockwave and detonation physics, hydrodynamics of high energy density flows, and dynamic material strength and damage studies [10,11]. Proton microscope PUMA allows the measurement of density distribution within static and dynamic objects by using a proton beam with energy of 800MeV. Proton-radiographic image of the object is formed in the plane of the detector with magnification k=4. An image of the object is formed using a magneto-optical system consisting of four quadrupole lenses on permanent magnets (PMQ). PUMA facility is designed for the measurement of objects with areal density of 20 g/cm2 and field of view of 20 mm. For the facility, the spatial resolution is from 60 microns to 115 microns for objects with areal density from 0.46 g/cm2 to 17 g/cm2, respectively. Research was also performed on nondestructive testing of static objects (including tomographic methods) and radiobiological studies.

Monte-Carlo Geant4 numerical simulation of experiments at 247-MeV proton microscope

A radiographic setup for an investigation of fast dynamic processes with areal density of targets up to 5 g/cm

Measurements of static electrical conductivity of a dense plasma in a magnetic field

^2

Studies of heavy ion-induced high-energy density states in matter at the GSI Darmstadt SIS-18 and future FAIR facility

is under development on the basis of high-current proton linear accelerator at the Institute for Nuclear Research (Troitsk, Russia). A virtual model of the proton microscope developed in a software toolkit Geant4 is presented in the article. Full-scale Monte-Carlo numerical simulation of static radiographic experiments at energy of a proton beam 247 MeV was performed. The results of simulation of proton radiography experiments with static model of shock-compressed xenon are presented. The results of visualization of copper and polymethyl methacrylate step wedges static targets also described.

Excimer Laser Pumped by an Intense, High-Energy Heavy-Ion Beam

New experimental setup for generation of a non-ideal plasma, placed in a magnetic field of up to 25 T, is presented. The plasma generation technique is based on gas compression and heating behind the front of a shock wave with the use of an explosively driven linear generator. The magnetic field is produced by a discharge of a capacitor through a solenoid reeled on the generator channel. DC electrical conductivity of the plasma is determined by two and four contact techniques. Possibilities of magnetized dense plasma generation are discussed.