Speaker
Dr
Min Chen
(Shanghai Jiao Tong University)
Description
Ionization injection can be used to get high quality electron beam in laser wakefield acceleration. To get low energy spread, two injection schemes are proposed here. By use of certain initially unmatched laser pulses, the electron injection can be constrained to the very front region of the mixed gas target, typically in a length of a few hundreds micro meters, and energy spread is largely reduced. By using this method, electron beam with FWHM energy spread less than 5% and peak energy around 500MeV is demonstrated by PIC simulations. In a second scheme, we suggest to use two-color beat wave to control the injection length. A beat wave is generated and the highest electric field due to the overlapping of the two peaks of the two laser waves can ionize the internal electrons and trigger the ionization injection. Due to the phase velocity difference of the two color pulses, the ionization distance is very limited which then lowers the injection length. By multi dimensional PIC simulations, we demonstrate electron beam with ultralow energy spread less than 1% percent and central energy of 400MeV can be obtained by using \omega and 3\omega laser pulses in a gas.
Primary author
Dr
Min Chen
(Shanghai Jiao Tong University)
Co-authors
Prof.
Bernhard Hidding
(Uni Gamburg/DESY & UCLA)
Prof.
D.A. Jaroszynski
(University of Strathclyde)
Prof.
Jie Zhang
(Shanghai Jiao Tong University)
Mrs
LuLe Yu
(Shanghai Jiao Tong University)
Mr
Ming Zeng
(Shanghai Jiao Tong University)
Prof.
W.B. Mori
(University of California, Los Angeles)
Prof.
Zheng-Ming Sheng
(Shanghai Jiao Tong University)
