Link do spotkania: https://bit.ly/3VGPHBH

Abstract

Ultraintense laser pulses of intensities of the order of ~10²²-10²³ W/cm² can be used for the production of high-energy heavy ion beams with unique parameters like: high intensities and fluence as well as short time duration. Thanks to this features such ion beams could be applied in various fields of scientific and technological research, such as: fast(FI) and shock(SI) ignition of inertial confinement fusion (ICF), nuclear physics or high energy density(HED) physics.

The lecture presents the results of numerical investigation of laser driven acceleration of heavy ion beams. The simulations were performed using an advanced two-dimensional particle in cell code.

During the first part of the presentation the acceleration of heavy ion with various atomic mass number by the lasers of different pulse energy and focal spot diameter, under condition relevant for ignition of inertial fusion will be discussed. The ion beam parameters crucial for this application, such as intensity, fluence, energy and energy spectrum of the ion beam will be compared for ion with mass number ranging from relatively low(Al,Ti) through medium(Cu,Ag) to high(Au) and for laser pulse of energy ranging from 150kJ to 250kJ as well as of focal spot diameter from 15µm to 30µm. It was found that for other fixed parameters, it is possible to identify the type of ion with the optimal mass number and the optimal laser pulse energy and focal spot diameter target ensuring the values of ion beam parameters that best meet ignition of inertial fusion.

During the second part of the presentation the results of simulations for acceleration of super-heavy ions from an ultra-thin lead target irradiated by a femtosecond laser pulse with the intensity in the range of ~ 10²²-10²³ W/cm² will be presented. It will be shown that by selecting the laser pulse parameters properly, it is possible to produce a practically single-charge Pb ion beam with multi-GeV ion energies and the laser-to-ions energy conversion efficiency approaching 30%. The ion beam of such parameters could be applied as a injector to the large scale RF-driven accelerators.