Speaker
Dr
Masaki Kando
(KPSI, QST)
Description
Laser accelerated electron beams are considered to be jitter-free with respect to a probe laser pulse that can be split from the driving laser pulse. Such feature is favorable to apply laser accelerated electron beams for pump-probe experiment. However, we have detected a large delay (~1 ps) of electron beams in a self-injected case when the plasma density is low. Increase of the plasma density the time delay was decreased as well as jitter. While electron beams using ionization injection do not show such time delays.
Our scheme utilized an electro-optical sampling technique with obliquely incident probe Ti:sapphire laser pulse. Electron beams were produced by focusing 400 mJ, 30 fs laser pulses irradiated onto helium or nitrogen gas target with a peak intensity of 1.8x10^18 W/cm^2. The timing was measured just after the gas-jet nozzle for 10-40 MeV electron beams with quasi-monoenergetic feature.
2D simulation results qualitatively reproduced our experimental results showing that injection mechanisms relate with the electron injection timing.
Primary author
Dr
Masaki Kando
(KPSI, QST)
