title: Enhanced Multi-MeV Photon Emission by a Laser-Driven Electron Beam in a Self-Generated Magnetic Field.
abstract: We use numerical simulations to demonstrate that a source of collimated multi-MeV photons with high conversion efficiency can be achieved using an all-optical single beam setup at an intensity of 5×10^{22}  W/cm^{2} that is already within reach of existing laser facilities. In the studied setup, an unprecedented quasistatic magnetic field (0.4 MT) is driven in a significantly overdense plasma, coupling three key aspects of laser-plasma interactions at high intensities: relativistic transparency, direct laser acceleration, and synchrotron photon emission. The quasistatic magnetic field enhances the photon emission process, which has a profound impact on electron dynamics via radiation reaction and yields tens of TW of directed MeV photons for a PW-class laser.
authors.affiliation: Institute for Fusion Studies, The University of Texas, Austin, Texas 78712, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Stark
authors.affiliation: Center for High Energy Density Science, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: T
authors.initials: T
authors.lastname: Toncian
authors.affiliation: Institute for Fusion Studies, The University of Texas, Austin, Texas 78712, USA.|Center for High Energy Density Science, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: A V
authors.initials: AV
authors.lastname: Arefiev