Vacuum Transverse-Fields Acceleration of Electron Bunch

We propose a feasible novel scheme of efficiently accelerating an electron bunch through a targeted-designed transverse-field configuration that consists of a laser and a DC magnetic field. Its merit over well-known longitudinal-field acceleration is the independence of the acceleration quality on the initial phase of the accelerated charge relative to the accelerator. Such an initial phase is a probability factor that is difficult to control. Strict theory and numerical experiment demonstrate that under available not-too-high strength, such as $ {10^{16}}\;{\rm W}/{{\rm cm}^2} $1016W/cm2 and $ 1 \sim 10\; {\rm Tesla} $1∼10Tesla, electronic energy gain in such a configuration can reach giga-electronvolt level over a time scale lasting 1600-fold laser cycles. The cost of achieving such an “accelerating ability” in the transverse field acceleration is far below that in the longitudinal-field acceleration. Other aspects of acceleration quality in such a transverse-field configuration also display the advantage of the configuration in achieving a compact, high-gain accelerator.