Beam Line Design of Compact Laser Plasma Accelerator

• Published in: Chinese physics letters Vol. 34; no. 5; pp. 44 - 47
• Main Author: 朱军高 朱昆 陶立 耿易星 林晨 马文君 卢海洋 赵研英 陆元荣 陈佳洱 颜学庆
• Format: Journal Article
• Language: English
• Published: 01.05.2017
• Subjects: 加速器; 加速实验; 束线; 激光等离子体; 空间电荷力; 紧凑型; 设计; 质子束
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/34/5/054101

A compact laser plasma accelerator that is a novel accelerator based on the interaction of ultra-intense laser and plasmas is being built now at Peking University. According to the results of experiments and numerical simulations, a beam line combining the advantages of quadrupole and analyzing magnets is designed to deliver proton beams with energy ranging from 1 to 44MeV, energy spread within ±5% and 10^6-8 protons per pulse. It turns out that the existence of space charge force of protons can be ignored for the increase of transverse and longitudinal envelopes even in the case of 10^9 protons in one pulse. To cope with the challenge to obtain a uniform distribution of protons at the final experiment target in laser acceleration, we manipulate the envelope beam waist in the Y direction to a proper position and obtain a relatively good distribution uniformity of protons with an energy spread of 0-±5%0.