Global optimization of the electron acceleration by a Gaussian beam

For vacuum electron acceleration by a Gaussian beam, the energy gain of the electron is sensitively influenced by the initial parameters of the electron and the laser beam. It is necessary to find a group of optimized initial parameters to achieve the highest energy gain. The relationships between the initial parameters and the energy gains are investigated comprehensively by the global optimization method, and the global maximum as well as the local maxima is obtained. Via employing the global optimization of the initial parameters, more efficient electron acceleration has been achieved.