Explanipedia

High-contrast front end based on Yb: YAG solid-state laser for PW-level Ti: sapphire laser Open

Hui Zhang, Minjian Wu, Yixing Geng, Chao Chen, Y. Jay Guo , et al. · 2025

In this paper, we demonstrate a high-contrast front-end laser system based on Yb: YAG solid-state laser for Ti: sapphire terminal amplification. An ultrafast Yb: YAG solid-state laser is used to generate a broad-spectrum seed through white…

Demonstration of proton acceleration using laser-driven EMP field in dispersion-free slow wave tube Open

Y. Z. Li, Chentong Li, Yang Yan, Yulong Fang, Hao Cheng , et al. · 2024

We demonstrate the laser-driven post-acceleration experiment, utilizing a miniature slow-wave structure. Experiments on a terawatt laser system showed a significant increase in proton cutoff energy, highlighting the technique's potential, …

High transmission efficiency collection system for laser-accelerated proton beams based on permanent magnet quadrupoles prefocusing Open

Yang Yan, Hao Cheng, Yuze Li, Yanlv Fang, Yadong Xia , et al. · 2024

A new high transmission efficiency, easily tunable, and cost-effective beam collection system is proposed for laser-accelerated proton beams with large divergence angles and wide energy spectra. In previous experiments conducted at the com…

Emittance growth analysis of laser-driven broad energy spectral proton beams Open

Minjian Wu, D. Y. Li, Tong Yang, Y. Z. Li, Hao Cheng , et al. · 2024

With the rapid development of high-gradient laser plasma acceleration, implementing it in practical applications has become a priority. However, to go from “acceleration” to “accelerator,” a beam line system is required to accurately contr…

A Sub-Picosecond Laser System Based on High-Energy Yb:YAG Chirped-Pulse Regenerative Amplification Open

Minjian Wu, Yixing Geng, Dahui Wang, Yanying Zhao · 2024

In this study, we have successfully demonstrated a high-energy subpicosecond Yb:YAG laser system based on chirped-pulse regenerative amplification. Our experimental results demonstrate a pulse energy of 3 mJ with a pulse duration of 829.8 …

Introduction of Research Work on Laser Proton Acceleration and Its Application Carried out on Compact Laser–Plasma Accelerator at Peking University Open

D. Y. Li, Tang Yang, Minjian Wu, Zhusong Mei, Kedong Wang , et al. · 2023

Laser plasma acceleration has made remarkable progress in the last few decades, but it also faces many challenges. Although the high gradient is a great potential advantage, the beam quality of the laser accelerator has a certain gap, or i…

Design of beam collection system with high transmission efficiency and tunablity Open

Yang Yan, Tong Yang, Dongxu Li, Hao Cheng, Y Z Li , et al. · 2023

A beamline is required to focus proton beams produced by laser plasma accelerator to high charge density spots for practical applications. The Compact LAser Plasma Accelerator (CLAPA) coupled with an image-relaying beamline has been built …

Measurements of plasma density profile evolutions with a channel-guided laser Open

Tong Yang, Zhen Guo, Yang Yan, Minjian Wu, Yadong Xia , et al. · 2023

The discharged capillary plasma channel has been extensively studied as a high-gradient particle acceleration and transmission medium. A novel measurement method of plasma channel density profiles has been employed, where the role of plasm…

Emittance growth due to energy spread in a laser-driven proton beamline Open

Matthew Easton, Kun Zhu, Kedong Wang, Minjian Wu, Chen Lin , et al. · 2021

Collection of particles from a laser-driven accelerator into a conventional beamline requires careful manipulation of the beam to handle the wide energy spread, large angular divergence and short pulse lengths characteristic of laser-drive…

Influence factors of resolution in laser accelerated proton radiography and image deblurring Open

D. Y. Li, Xiaohan Xu, Tong Yang, Minjian Wu, Y. F. Zhang , et al. · 2021

Contact imaging based on MeV energy laser accelerated protons is studied in this paper. First, we show that both external structures and the internal organs of ants can be distinguished with micrometer spatial resolution by proton radiogra…

Designing of active plasma lens for focusing laser-plasma-accelerated pulsed proton beams Open

Tong Yang, Hao Cheng, Yang Yan, Minjian Wu, Dongyu Li , et al. · 2021

Active plasma lenses (APLs) have been proved as an effective device for focusing charged particles. In this paper, we have theoretically studied the feasibility of using a discharged-capillary based high gradient APL to focus laser acceler…

Demonstration of tailored energy deposition in a laser proton accelerator Open

Jungao Zhu, Minjian Wu, Kejun Zhu, Yixing Geng, Qing Liao , et al. · 2020

International audience

Proton beams from intense laser-solid interaction: Effects of the target materials Open

Yixing Geng, Dong Wu, Wei Yu, Z. M. Sheng, S. Fritzsche , et al. · 2020

We report systematic studies of laser-driven proton beams produced with micrometer-thick solid targets made of aluminum and plastic, respectively. Distinct effects of the target materials are found on the total charge, cutoff energy, and b…

Emittance measurement along transport beam line for laser driven protons Open

Minjian Wu, D. Y. Li, Jungao Zhu, Tong Yang, Xiangyun Hu , et al. · 2020

Particle emittance quantifies the ability to focus and transport a beam, and is one of the most important parameters for a beamline. The emittance of a proton beam produced by ultraintense laser irradiation of a micron-thick flat solid tar…

Experimental demonstration of a laser proton accelerator with accurate beam control through image-relaying transport Open

Jungao Zhu, Minjian Wu, Qing Liao, Yixing Geng, Kejun Zhu , et al. · 2019

A compact laser plasma accelerator (CLAPA) that can stably produce and transport proton ions with different energies less than 10 MeV, <1% energy spread, several to tens of pC charge, is demonstrated. The high current proton beam with cont…

Applications of Compact Laser Plasma Accelerator (CLAPA) Beamline in Peking University Open

Dongyu Li, Jiaer Chen, Yixing Geng, Xiyao Hu, Chengcai Li , et al. · 2019

Proton beam with energies less than 10 MeV, 1% energy spread, several to tens of pC charge can be stably produced and transported in Compact LAser Plasma Accelerator (CLAPA) at Peking University. The CLAPA beam line is an object-image poin…

Preliminary Emittance Measurement of Laser Driven Proton Beam Employing a Quadruple Triplet Magnet Open

Minjian Wu, Yixing Geng, Qing Liao, Chen Lin, Haiyang Lu , et al. · 2018

The Compact Laser Plasma Accelerator (CLAPA) has been built recently at Peking University, which composed of a 200TW laser acceleration platform and a beam line system. Proton with energy spread of <1%, up to 10 pC charge and different ene…

Monoenergetic Beam Generated by Laser Accelerator at Peking University Open

Kun Zhu, Jiaer Chen, Yixing Geng, Chengcai Li, Dong Li , et al. · 2018

An ultrahigh-intensity laser incident on a target sets up a very strong electrostatic field exceeding 100 GV/m, it will few orders magnitude shrink down the traditional radio frequency accelerators. Whereas, to build a real accelerator for…

Laser proton accelerator with improved repeatability at Peking University Open

Yinren Shou, Yixing Geng, Qing Liao, Jia-Ji Zhu, Pengjie Wang , et al. · 2017

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 Univers…

Clinical treatment of venous and microcystic lymphatic malformation on oral mucosa by diode laser Open

Y.N. Liu, X.J. Liu, Minjian Wu, Fanyu Zhao · 2017

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