Imre Ferenc Barna

Observables and initial conditions for rotating and expanding fireballs with spheroidal symmetry

Utilizing a recently found class of exact, analytic rotating solutions of non-relativistic fireball hydrodynamics, we calculate analytically the single-particle spectra, the elliptic flows and two-particle Bose-Einstein correlation functions for rotating and expanding fireballs with spheroidal symmetry. We demonstrate, that rotation generates final state momentum anisotropies even for a spatially symmetric, spherical initial geometry of the fireball. The mass dependence of the effective temperatures, as well as the HBT radius parameters and the elliptic flow are shown to be sensitive not only to radial flow effects but also to the magnitude of the initial angular momentum.

Heat conduction: a telegraph-type model with self-similar behavior of solutions

For the heat flux q and temperature T, we introduce a modified Fourier–Cattaneo law qt + lq/(t + τ) = −kTx. The consequence of it is a non-autonomous telegraph-type equation. This model already has a typical self-similar solution which may be written as a product of two traveling waves modulo a time-dependent factor and might play a role of intermediate asymptotics.

Laser-assisted proton collision on light nuclei at moderate energies

We present analytic angular differential cross section model for laser assisted proton nucleon scattering on a Woods-Saxon optical potential where the nth-order photon absorption is taken into account simultaneously. As a physical example we calculate cross sections for proton -

Pre-excitation studies for rubidium-plasma generation

^{12}

Analytic solutions for the three-dimensional compressible Navier–Stokes equation

C collision at 49 MeV in the laboratory frame where the laser intensity is in the range of

Two-phase flow model for energetic proton beam induced pressure waves in mercury target systems in the planned European Spallation Source

10^{7} - 10^{21}

Single and double ionization of helium in heavy-ion impact

W/cm

Analytic self-similar solutions of the Oberbeck–Boussinesq equations

^2

Heat Conduction: Hyperbolic Self-similar Shock-waves in Solid Medium

at optical frequencies. The upper intensity limit is slightly below the relativistic regime.

Electron acceleration in underdense plasmas described with a classical effective theory

The key element in the Proton-Driven-Plasma-Wake-Field-Accelerator (PWFA) project is the generation of highly uniform plasma from Rubidium vapor. A scientifically straightforward, yet highly challenging way to achieve full ionization is to use high power laser which can assure the barrier suppression ionization (BSI) along the 10 m long active region. The Wigner-team in Budapest is investigating an alternative way of uniform plasma generation. The proposed Resonance Enhanced Multi-Photon Ionization (REMPI) scheme can be probably realized by much less laser power. In the following we plan to investigate the resonant pre-excitations of the Rb atoms, both theoretically and experimentally. In the following our theoretical framework is presented together with the status report about the preparatory work of the planned experiment.