High Power Laser Science and Engineering, 2021, 9 (1): 010000e2, Published Online: Jan. 12, 2021
Magnetic field annihilation and charged particle acceleration in ultra-relativistic laser plasmas 
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Figures & Tables
Fig. 1. (a) The initial condition of 1D model. (b) Magnetic field annihilation and electric field growing.
.
Fig. 3. The numerical demonstration of static magnetic field driven by energetic electron beam. (a) The electron density distribution with the plasma channel formation. (b) The blue and red curves represent the longitudinal electric field and the electron density profile on the laser axis (
). (c) The average energy distribution of the electrons. (d) The z component of the azimuthal magnetic field induced by the energetic electron beam.
Fig. 4. (a) The transverse expansion of the magnetic dipole along a density downramp region. The distributions of 
at different snapshots are combined here. (b) The profiles of 
along different 
-coordinates.
Fig. 5. (a) The energy density distribution (
) of electrons. The round circles represent the azimuthal magnetic fields. The projections of 
components in (b) the uniform density region and (c) the density downramp region.
Fig. 6. (a) and (b) are contours of the constant vector potentials around the 
-point based on theoretical model. (a) refers to the initial stage when the opposite magnetic fields just begin to vanish. (b) refers to the moment when the current sheet in MR has formed and bifurcated. (c) and (d) are the corresponding distributions demonstrated by numerical simulations.
Fig. 7. (a) The magnetic field 
distributions in the simulation when MR is occurring. (b) The surface represents the distribution of longitudinal electric field (
). The curves are the profiles of all the components in Ampere-Maxwell law (Equation (57) ).
Fig. 8. The energy distributions of the electrons inside current sheet before and after magnetic field reconnection.
Fig. 9. (a) Schematic of the theoretical model in the vicinity of 
-point. (b) The analytical solutions of particles motion with the expressions in Equations (96) and (97) . (c) and (d) are the trajectories of charged particles given by the solutions of Equations (98) and (99) for the initial conditions of 
, 
and 
. (e) and (f) show the typical accelerated particle trajectories obtained in the kinetic simulations.
Fig. 10. (a) The intensity distribution of 
mode laser on the focused plane and (b) the corresponding profile. (c) The electron density distribution and (d) the 
distribution obtained from numerical simulations in the interaction of 
mode laser with plasma.
Fig. 11. (a) The evolution of incident laser intensity before and after interacting with the solid cone target. A loop structure (donut shape) is formed. (b) The electron density distribution driven by the donut shape field. The rear plane corresponds to the density distribution slice of 
. The left plane is the projection of the slice of 
. The bottom plane is the projection of magnetic field 
distribution, which shows the magnetic dipoles are formed.
Yan-Jun Gu, Sergei V. Bulanov. Magnetic field annihilation and charged particle acceleration in ultra-relativistic laser plasmas[J]. High Power Laser Science and Engineering, 2021, 9(1): 010000e2.
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