At the Gesellschaft für Schwerionenforschung (GSI, Darmstadt)
intense beams of energetic heavy ions have been used to generate
high-energy-density (HED) state in matter by impact on solid
targets. Recently, we have developed a new method by which we
use the same heavy ion beam that heats the target to provide
information about the physical state of the interior of the
target (Varentsov et al., 2001). This is accomplished
by measuring the energy loss dynamics (ELD) of the
beam emerging from the back surface of the target. For this
purpose, a new time-resolving energy loss spectrometer
(scintillating Bragg-peak (SBP) spectrometer) has been developed.
In our experiments we have measured energy loss dynamics of
intense beams of 238U, 86Kr, 40Ar,
and 18O ions during the interaction with solid rare-gas
targets, such as solid Ne and solid Xe. We observed continuous
reduction in the energy loss during the interaction time due
to rapid hydrodynamic response of the ion-beam-heated target
matter. These are the first measurements of this kind.
Two-dimensional hydrodynamic simulations were carried out using
the beam and target parameters of the experiments. The conducted
research has established that the ELD measurement technique
is an excellent diagnostic method for HED matter. It specifically
allows for direct and quantitative comparison with the results
of hydrodynamic simulations, providing experimental data for
verification of computer codes and underlying theoretical models.
The ELD measurements will be used as a standard diagnostics
in the future experiments on investigation of the HED matter
induced by intense heavy ion beams, such as the HI-HEX (Heavy
Ion Heating and EXpansion) EOS studies (Hoffmann et al.,
2002).
An Evaluation of Energy-loss Straggling Calculation of the LISE++ Code
