Leiser Silva

Ponderomotive force of quasiparticles in a plasma

We derive the force exerted in the background plasma by an arbitrary distribution of non interacting quasi-particles, corresponding to either collective excitations of the plasma (plasmons, phonons) or em dressed particles (photons, neutrinos). Our approach is based on the effective Hamiltonian describing the quasi-classical dynamics of the individual particles in the presence of a background medium. We recover the usual results for the relativistic ponderomotive force of a photon gas, and we derive the force, due to weak interactions, exerted by the electron-neutrinos in a background medium containing electrons, positrons and neutrons with arbitrary distribution functions. Generalization to other background species and other neutrino flavors is also discussed.We derive the force exerted on the background plasma by an arbitrary distribution of noninteracting quasiparticles, corresponding to either collective excitations of the plasma (plasmons and phonons) or dressed particles (photons and neutrinos). Our approach is based on the effective Hamiltonian describing the quasiclassical dynamics of the individual particles in the presence of a background medium. We recover the usual results for the relativistic ponderomotive force of a photon gas and a plasmon gas and we derive the force, due to weak interactions, exerted by the electron neutrinos in a background medium containing electrons, positrons, and neutrons with arbitrary distribution functions. Generalization to other background species and other neutrino flavors is also discussed.

Radiation in 1.5 GeV and 12 GeV Laser Wakefield Acceleration Stages from PIC Simulations

A massivelly parallel post‐processing radiation diagnostic for PIC codes is presented, which is then used to study the main features of the radiation from single LWFA stages (1.5 GeV and 12 GeV). This diagnostic also allows to examine radiation signatures associated with the physics of self‐injection.