3 research outputs found
Nonperturbative QED Processes at ELI-NP
The present paper analyses the current results and pursuits the main steps
required for the design of SF-QED experiments at High-Power Laser System (HPLS)
of ELI-NP in Magurele, Romania. After a brief analysis of the first experiment
(E-144 SLAC), which confirmed the existence of non-linear QED interactions of
the high energy electrons with the photons of a laser beam, we went on to
present fundamental QED processes possible to be studied at ELI-NP in a
multi-photon regime. The kinematics and characteristic parameters of the laser
beam interacting with electrons were presented. In the preparation of an
experiment at ELI-NP, the analysis of the kinematics and dynamics of the
non-linear QED interaction processes with the physical vacuum are required.
Initially, the linear QED processes and the corresponding Feynman diagrams that
allow to determine the amplitude of these processes are reviewed. Based on
these amplitudes, the cross sections of the processes can be obtained. For
multi-photon interactions it is necessary to adapt the technique of Feynman
diagrams from linear QED processes to the non-linear ones, by moving to the
quantum field description with dressed Dirac-Volkov states, for particles in
intense EM field. They then allow evaluation of the amplitude of the physical
processes and ultimately the determination of the corresponding cross section.
The SF-QED processes of multi-photon interactions with strong laser fields, can
be done taking into account the characteristics of the existing facilities at
ELI-NP in the context of the experimental production of electron-positron-pairs
and of energetic gamma-rays. We show also some upcoming experiments similar to
ours, in various stages of preparation.Comment: Presented at Bucharest University Meeting 2023
https://ssffb.fizica.unibuc.ro/SSFFB/Section.php?SectID=22
Characterization of biogenic ferrihydrite nanoparticles by means of SAXS, SRD and IBA methods
Investigations of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella
oxytoca by applying small angle X-ray scattering, synchrotron radiation diffraction and ion
beam analysis methods are reviewed. Different experimental data processing methods are used
and analyzed