Laser proton accelerator with improved repeatability at Peking University

8th International Particle Accelerator Conference

Shou, Y.^1 ; Geng, Y.^1 ; Liao, Q.^1 ; Zhu, J.^1 ; Wang, P.^1 ; Wu, M.^1 ; Li, C.^1 ; Xu, X.^1 ; Li, R.^1 ; Lu, H.^1 ; Zhao, Y.^1 ; Ma, W.^1 ; Lin, C.^1 ; Yan, X.^1

State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China^1

关键词: Alignment system;    Cross-polarized;    Laser parameters;    Laser target coupling;    Laser-plasma interactions;    Peking University;    Repetition rate;    Semi-automatics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012043/pdf
DOI  :  10.1088/1742-6596/874/1/012043

来源: IOP

【 摘 要 】

The repeatability of laser proton accelerator is mainly limited by laser plasma interaction, laser target coupling and laser parameter variation. In our recent experiments performed on the Compact Laser Plasma Accelerator at Peking University, gain of proton beams with improved repeatability is demonstrated. In order to control the laser plasma interaction in pre-plasma, cross polarized-wave generation technique is employed to provide a laser pulse with an ultrahigh contrast of 10-10A semi-automatic laser and target alignment system with a sensitivity of few microns is employed. The repetition rate of the laser pro-ton accelerator is at the level of 0.1 Hz which is beneficial to decrease laser parameter variation. The shot-to-shot variation of proton energies is about 9% for a level of confidence of 0.95.