Dr. Sang Yun Shin Profile

Dr. Sang Yun Shin

Research Professor at Korea Univ Sejong Campus

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Publications (3)

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Proceedings Article | 20 July 2023 Presentation

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, PC1257904 (2023) https://doi.org/10.1117/12.2669928

KEYWORDS: X-ray sources, Modulation, Iron, Pulsed laser operation, Plasma, Magnetism, Laser applications, Vacuum, Titanium, Sapphire lasers

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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.

Proceedings Article | 9 June 2023 Presentation

Control of electron injection in LWFA with structured metal targets (Conference Presentation)

Seong Hee Park, Hyeon Woo Lee, Sang Yun Shin

Proceedings Volume PC12579, PC125790C (2023) https://doi.org/10.1117/12.2670009

KEYWORDS: Metals, Ionization, Ions, Femtosecond phenomena, Plasma, Laser development, Diffraction, Copper, Capillaries, Aluminum

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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)

Proceedings Article | 18 April 2021 Presentation + Paper

Control of betatron emission via LWFA using aluminum target

Sang Yun Shin, Seong Hee Park

Proceedings Volume 11778, 1177807 (2021) https://doi.org/10.1117/12.2592517

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The laser wake-field acceleration (LWFA) has been spotlighted as a compact electron accelerator, because of its accelerating gradient being several hundred times higher than conventional RF accelerators. In LWFA, a supersonic gas jet or discharged gas flow in a capillary is typically used as a plasma target, Recently, a plasma plume ablated from a solid target, such as, Teflon, Nylon or Aluminum, using a nano-second or pico-second laser pulse is proposed to maintain high vacuum and possibly operate at high repetition rate. In addition, it was demonstrated that metals, like aluminum, having higher charge states play an important role to increase the electron charge. Compared with the LWFA mechanism using helium or hydrogen gases, the LWFA using metallic targets involves the ionization effects. It boosts more electrons to be injected in a wake cavity, while reduces the acceleration length due to ionization diffraction. As increasing the injected electrons, more dynamic betatron oscillation is observed. For developing the new betatron emitter using LWFA, we suggest a dual-staged LWFA using metallic targets: the first is as a source, an energetic electron bunch, and the second is as a radiator. In this presentation, an overview and a study of the control of the betatron emission via 2D or 3D PIC (Paritlce-in-cell) code simulations are described.

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