Abstract
The thorough exploration of the transverse quality represented by divergence angle has been lacking yet in the energy spread measurement of the relativistic electron beam for laser wakefield acceleration(LWFA).In this work,we fill this gap by numerical simulations based on the experimental data,which indicate that in a C-shape magnet,magnetic field possesses the beam focusing effect,considering that the divergence angle will result in an increase in the full width at half maxima(FWHM)of the electron density distribution in a uniformly isotropic manner,while the length-to-width ratio decreases.This indicates that the energy spread obtained from the electron deflection distance is smaller than the actual value,regardless of the divergence angle.A promising and efficient way to accurately correct the value is presented by considering the divergence angle(for instance,for an electron beam with a length-to-width ratio of 1.12,the energy spread correct from 1.2％to 1.5％),providing a reference for developing the high-quality electron beam source.
基金项目
国家重点研发计划(2021YFA1601700)
国家自然科学基金(12074251)
国家自然科学基金(11991073)
国家自然科学基金(12335016)
国家自然科学基金(12305272)
国家自然科学基金(12105174)
中国科学院战略规划重点项目(XDA25000000)
中国科学院战略规划重点项目(XDA25030400)
Yangyang Development Fund,China()
NETL
NSTL
万方数据