Positioning of Transparent Targets Using Defocusing Method in a Laser Proton Accelerator
Abstract
We report a positioning method for transparent targets with an accuracy of \SI{2}{\mu m} for a compact laser proton accelerator. The positioning system consists of two light-emitting diodes (LED), a long working distance objective and two charge coupled devices (CCD) for illumination, imaging and detection, respectively. We developed a defocusing method making transparent targets visible as phase objects and applied it to our system. Precise positioning of transparent targets can be realized by means of minimizing the image contrast of the phase objects. Fast positioning based on the relationship between the radius of spherical aberration ring and defocusing distance is also realized. Laser proton acceleration experiments have been performed to demonstrate the reliability of this positioning system.
Keywords
Cite
@article{arxiv.1804.10433,
title = {Positioning of Transparent Targets Using Defocusing Method in a Laser Proton Accelerator},
author = {Yinren Shou and Dahui Wang and Pengjie Wang and Jianbo Liu and Zhengxuan Cao and Zhusong Mei and Yixing Geng and Jungao Zhu and Qing Liao and Yanying Zhao and Chen Lin and Haiyang Lu and Wenjun Ma and Xueqing Yan},
journal= {arXiv preprint arXiv:1804.10433},
year = {2019}
}
Comments
5 pages, 4 figures