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Self-generated magnetic fields in the relativistic laser-plasma interaction

Strong magnetic fields can be generated when an intense laser pulse interacts with plasma. The spontaneous magnetic fields as large as several mega-Gauss have been directly measured in the blowoff plasma in front and rear of solid targets ,and attributed to a mechanism that occurs when the plasma density gradient∇n and temperature gradient ∇T are not collinear, These magnetic fields, which can become strong enough to significantly affect transport, are attributed to nonlocal effects that are missing in the standard, local theories .In this paper ,The self-generated magnetic field by a relativistic laser pulse irradiated on a thin plasma target at the perpendicular incidence is investigated using a two dimensional particle-in cell simulation.