R&D on compact soft x-ray source using high-vacuum laser electron accelerator

Seong Hee Park; Keon Ho Kim; Hyeon Woo Lee; Sang Yun Shin

doi:10.1117/12.2669928

20 July 2023 R&D on compact soft x-ray source using high-vacuum laser electron accelerator

Seong Hee Park, Keon Ho Kim, Hyeon Woo Lee, Sang Yun Shin

Proceedings Volume PC12579, Laser Acceleration of Electrons, Protons, and Ions VII; PC1257904 (2023) https://doi.org/10.1117/12.2669928
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

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.

Conference Presentation

Citation Download Citation

Seong Hee Park, Keon Ho Kim, Hyeon Woo Lee, and Sang Yun Shin "R&D on compact soft x-ray source using high-vacuum laser electron accelerator", Proc. SPIE PC12579, Laser Acceleration of Electrons, Protons, and Ions VII, PC1257904 (20 July 2023); https://doi.org/10.1117/12.2669928

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