Ultrahigh energy proton generation in sequential radiation pressure and bubble regime

Zhang, Xiaomei; Shen, Baifei; Ji, Liangliang; Wang, Fengchao; Wen, Meng; Wang, Wenpeng; Xu, Jiancai; Yu, Yahong
December 2010
Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p123102
Academic Journal
Protons in a microtarget embedded in an underdense high-mass plasma can be accelerated sequentially by the radiation pressure of a short circularly polarized laser pulse and the induced wake bubble field in the background plasma, which has been shown in detail by two-dimensional particle in cell simulations. It has been found that instead of using transverse Gaussian pulses proton energy can be increased dramatically by using a transverse super-Gaussian laser pulse. With a 2.14×1023 W/cm2 laser pulse in a tritium plasma of density 1.5×1020/cm3, 76 GeV high-quality quasimonoenergetic protons have been obtained. The scaling relations between the obtainable proton energy and the laser amplitude as well as the background plasma density have been shown.


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