LINAC2026 - 33rd Linear Accelerator Conference

GeV scale electron beam generation by a downramp injection with a waveguide structure for laser wakefield accelerations

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC1.A04 Plasma and wakefield acceleration Poster Session

Speaker

Hyeon Myeong Jeong (Ulsan National Institute of Science and Technology)

Description

Laser wakefield acceleration (LWFA) enables compact accelerator with accelerating gradient of GV/cm scale in the wakefield in the plasma excited by ponderomotive force of intense laser. We used the waveguide to increase interaction length and downramp injection method to control the injection which results in electron beams with GeV scale energy and low energy spread. However, to combine the downramp into the plasma waveguide, it is difficult to optimize a matched spot size during the propagation due to its nonlinear characteristics that strongly affect the electron beam quality. We used the dynamic matched spot size profile in the first and second plasma region rather than fixed value on the particle-in-cell (PIC) simulation. We found that optimum plasma density profile with the dynamically matched spot size for the waveguide. Simulation results shows the electron beam with 2.5 GeV and energy spread of less than 1.0 % (rms) with matched spot size as compared with a misaligned case.