Stefano Sinigardi (BO)
TNSA numerical simulations have many uncertainties, due to the large arbitrariness in input parameters, besides huge computational costs for 3D. The energy spectrum of the accelerated particles is exponential with a cut-off and is correctly reproduced, but the maximum energy obtained depends on many user-chosen parameters, for example the simulation end time. The growth in time of the maximum energy follows different laws in 2D and 3D, the former following a logarithmic growth while the latter converging to an asymptotic value: the determination of an ultimate value is often arbitrary. In a recent paper, we proposed two laws for these rise in time of the cut-off energies: we have considered both a 2D model in which the surface charge is located on a strip with infinite length and a 3D model in which the surface charge is located on a disc. Fitting simulation results with the appropriate law, one can obtain the a more robust numerical cut-off energy. Our method can give a more insightful meaning to 2D simulations and also allows to stop 3D simulations quickly, using our law to obtain the maximum energy asymptotic value without reaching it.
Giorgio Turchetti (BO) Stefano Sinigardi (BO)
Javad Babaei (Department of Physics, Faculty of Basic Sciences, University of Mazandaran) Leonida Antonio Gizzi (PI) Pasquale Londrillo (INAF OABO) Prof. Saeed Mirzanejad (Department of Physics, Faculty of Basic Sciences, University of Mazandaran) Tiziano Rovelli (BO)