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The linear accelerator of the PLS-II in Pohang has been in operation for approximately 30 years, leading to performance degradation and stability issues. To address these challenges, this study proposes a storage ring injector based on a laser-plasma accelerator (LPA), capable of generating GeV-class electron beams with high accelerating gradients, and analyzes its feasibility. Assuming an electron beam is generated by an LPA, its longitudinal properties are controlled by passing it through an injector composed of quadrupoles, a magnetic chicane, and an RF cavity. In particular, an energy chirp is introduced via the magnetic chicane and subsequently compensated by the RF cavity, thereby reducing the energy spread and minimizing energy jitter. In addition, key parameters such as the strength of the chicane, the spacing between dipoles, and the RF power and phase are varied to determine the optimal conditions for injector operation. Through this approach, the feasibility of injection into the 3 GeV PLS-II storage ring is quantitatively analyzed, and the potential to significantly reduce the spatial footprint compared to conventional linear accelerators is evaluated.
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