摘要
Proton acceleration in a near-critical-density gas driven by a light spring(LS) pulse with a helical structure in its intensity profile is investigated using three-dimensional particle-in-cell simulations. Compared with other pulse modes with the same laser power, such as the Gaussian pulse or the donut Laguerre–Gaussian(LG) pulse, the LS structure significantly enhances the peak intensity and drives a stronger longitudinal acceleration field and transverse focusing field. Both the high intensity and helical structure of the LS pulse contribute to the formation of a bubble-like structure with a fine electron column on the axis, which is critical for stable proton acceleration. Therefore, it is very promising to obtain ultra-high-energy protons using LS pulses with a relatively lower power. For example, by using LS pulses with the same power of 4.81 PW, the proton in the gas can be accelerated up to 8.7 Ge V, and the witness proton can be accelerated to10.6 Ge V from 0.11 Ge V, which shows the overwhelming advantage over the Gaussian and LG pulse cases.
基金
supported by the National Natural Science Foundation of China(Nos.12475247,11935008 and 12305274)
