High Power Laser Science and Engineering, 2016, 4 (3): 03000e24, Published Online: Nov. 7, 2016
Generation of high-quality electron beams by ionization injection in a single acceleration stage Download: 708次
ionization injection ionization injection laser–plasma acceleration laser–plasma acceleration PIC simulations PIC simulations self-truncation self-truncation wakefield wakefield
Abstract
Ionization-induced electron injection in laser wakefield accelerators, which was recently proposed to lower the laser intensity threshold for electron trapping into the wake wave, has the drawback of generating electron beams with large and continuous energy spreads, severely limiting their future applications. Complex target designs based on separating the electron trapping and acceleration stages were proposed as the only way for getting small energy-spread electron beams. Here, based on the self-truncated ionization-injection concept which requires the use of unmatched laser–plasma parameters and by using tens of TW laser pulses focused onto a gas jet of helium mixed with low concentrations of nitrogen, we demonstrate single-stage laser wakefield acceleration of multi-hundred MeV electron bunches with energy spreads of a few percent. The experimental results are verified by PIC simulations.
Nasr A.M. Hafz, Song Li, Guangyu Li, Mohammad Mirzaie, Ming Zeng, Jie Zhang. Generation of high-quality electron beams by ionization injection in a single acceleration stage[J]. High Power Laser Science and Engineering, 2016, 4(3): 03000e24.