A laser electron accelerator using a laser-ablated metallic target has been developed for the applications of compact light sources at high-vacuum and/or high repetition rate. Unlike any plasma targets using gases, the total amount of molecules generated by ablating a ns or ps laser pulse on metal target is too small to change the vacuum level while the electron plasma density is reached the proper level required for laser acceleration through the optical ionization process by high-intensity Ti:Sapphire laser (here, called the main laser). The density enhancement as well as the electron injection in laser acceleration will be different for target elements (aluminum, copper, titanium, and so on).
The ring-type permanent dipole magnet suggested has a periodic modulation of magnetic-field strength along the trajectory due to H-type iron yoke, indicating the possibility of improvement of beam stability and the angular acceptance of injection. We added the hill-valley ratio of ring-type iron pole gap to adjust the modulation strength of the azimuthally-varying magnetic field. The vertical focusing may increase as increasing the hill-valley ratio, at the expense of average field strength.
In this paper, the beam quality and stability depending on the metallic target structure and the magnetic field modulation due to ring-type iron pole structure are presented.
Laser wakefield acceleration (LWFA) using laser-ablated metallic plasma targets has been developed for high-vacuum and high-repetition rate operations. Unlike the supersonic gas jet targets or capillary gas discharge target, the ionization effect of metallic ions due to high intensity fs laser increases the ionization diffraction and ionization injection, resulting in larger energy spread with higher charge.
We proposed a structured metal target using two different metals to improve the beam quality. By adding a thin Ti or Cu wire in aluminum target and changing the focal position of fs laser pulse with respect to the position of the thin-layered zone, the injection timing of electrons depleted from ions of thin wire can be adjusted to improve the beam quality. We present and discuss the simulation results depending on the thickness and the position of the thin layer.
*This work was supported by the National Research Foundation of Korea(NRF) grant founded by the Korea government(MSIT). (NRF Grant No. : NRF-2021R1A2C2094300, and RS-2022-0014317)
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