Using Super Gaussian Laser Pulse Inhibit Ion In The Stationary Phase To Accelerate A Target Of Lateral Spreading

Phase-stable Acceleration(PSA),so called as Light-sail Acceleration has been deeply investigaged, and have a series of relatively perfect theory. It comes to a conclusion that when the initial target density n0and thickness D satisfy al～(n0/nc)(D/λ) and D>1x, we will obtain a long time and stable accelation. where al, λL,ls, and nc is normalized amplitude, the laser wavelength in vacuum, the plasma skin depth and the critical density of incident laser pulse. But because of the profile of the Gaussian plasma which have a strong field in the center and a weak one in the margin, when it interacts with the target, the front of the pulse will bend over and the ions accelerated by this pulse will diffuse in the transverse direction, which whill destroy the monoenergeticy of the accelerated ions. It has been researched that with the supper Gaussion pulse instead of the Gaussian pulse this problem can be greatly improved. In our work, with the help of VORPAL PIC program, we make the one dimension simulation and also the two dimension ones. and we find that with a hollow in the center of the supper Gaussian pulse, the pulse have a better result even than the normal supper Gaussian pulse, especially when the hollow radius d=5, we have the best result.