TNSA of Proton by Elliptically Polarized PW Laser Pulse Under the Influence of Axial Magnetic Field
Vidushi Vyas and Harjit Singh Ghotra
Proton acceleration is studied theoretically via target normal sheath acceleration (TNSA) mechanism using the field of an elliptically polarized (EP) Gaussian laser pulse during laser-thin foil interaction. Strong charge separation between the ions and electrons results to sheath formation at rear side of target. The polarization dependent propagation characteristics of elliptical symmetry frames the sheath field which induce Giga-Gauss (GG) order self-generated magnetic field on target surface while the laser intensity is in the range of 1018-1021 W/cm2. Additionally, there is an externally applied axial magnetic field (~MG) which strengthen the force that support to accelerate the protons from the target surface with energy gain of 10-60MeV with 1-4 PW laser power. The investigations with externally applied axial magnetic field open up the way for new mechanism for proton acceleration to higher energy using PW class laser systems.
Keywords: Proton acceleration, Target Normal Sheath Acceleration (TNSA), Elliptically polarized laser, Axial magnetic field, Petawatt laser, SDG Energy.