Speaker
Description
Laser plasma accelerators (LPA) are expected to achieve acceleration gradients several orders of magnitude higher than conventional accelerators, thereby providing a promising route to the development of compact high-energy particle accelerators. However, the electron beams generated by current LPAs exhibit considerable energy spread and significant shot-to-shot energy jitter—issues that are particularly pronounced for high-charge bunches—severely restricting their practical application in fields such as ring injectors.
Our team proposed a transfer line configuration integrating an active plasma dechirper, a passive plasma dechirper, and magnetic chicanes (Xueyan Shi et al. New J. Phys. 26, 073045, 2024). Start-to-end simulations demonstrated that for 500 MeV electron beams with a charge of 500 pC, this scheme reduces the energy jitter from ±2% to 0.1% and the energy spread from 1.2% to 0.5%.
In the present work, we extend the beam charge to the nanocoulomb (nC) level to explore the performance limits of this approach. Preliminary simulation results show that for a 1 nC electron beam with an initial root-mean-square (rms) energy spread of 1.2% and energy jitter of ±2%, the proposed scheme can reduce these parameters to 0.2% and 0.4%, respectively, while maintaining a transmission efficiency of 81.2%. Additionally, we verified the feasibility of using such LPA-generated beams as injectors for the High Energy Photon Source (HEPS) booster by simulations.
Footnotes
*Shi X, Xu H, Li D, et al. Energy stabilization of high-charge bunches from laser plasma accelerators[J]. New Journal of Physics, 2024, 26(7): 073045.
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