超强光场驱动的高性能高能粒子束的产生及其应用开拓研究

王乃彦++沈百飞++陆元荣

摘 要：超短超强激光驱动等离子体，可获得电子能量高达1GeV、质子能量高达60MeV的高性能粒子束，从而在高能加速器、聚变物理、短脉冲高亮度X光源产生、实现小型化自由电子激光等领域都有重大的应用价值。该研究主要研究利用超短超强激光在等离子体中形成稳定的特殊三维尾波结构，即空泡，实现单能电子加速。采用两种控制电子注入的方法，即两束激光对打和纳米细丝扰动，来提高电子加速的稳定性，并控制高能电子的数量和能量。该研究还将通过改变激光传输方向的等离子体密度，来改变空泡中纵向加速静电场的梯度，从而抵消高能电子束本身电荷分离场的梯度，以提高电子束的性能；还将研究高能电子束的细致结构，并考虑其可能的重大应用。该研究将利用靶后鞘层加速实现质子加速，并将利用多层靶来提高加速效率，利用微结构靶获得准单能质子束，同时研究获得高性能高能离子束的其他有效途径。

关键词：高能电子束 高能质子束 超短超强激光

High Quality Particle Acceleration Driven by Ultraintense Laser Plasma Interaction and Its Application

Wang Naiyan1 Shen Baifei2 Lu Yuanrong3

（1.China Institute of Atomic Energy；2.Shanghai Institute of Optics and Fine Mechanics， Chinese Academy of Sciences；

3.Peking University）

Abstract：Laser-driven wakefield acceleration （LWFA） of electrons and target normal sheath acceleration （TNSA） of ions have made remarkable progress in the last decade. Electrons and protons with energy about 2 GeV and near 100MeV have been obtained respectively. However， there are still several serious problems about this novel accelerating approach： the total charge of a typical energetic electron beam from LWFA is only at the pC level； proton energy in TNSA is still quite low； the accelerating efficiency is relatively low， less than 10%. These parameters are still quite far from applicable and severely limit the realization of laser acceleration technique. This project then aims to break through the above restrictions and motivate multi-applications of laser-electron/ion acceleration. For LWFA， intense laser pulses will be employed to produce 30 nC energetic electron beams. Furthermore， the high-charge electron beam will impinge on gold target to generate positron source. For TNSA， based on the former results， where 7MeV protons have been obtained， the project will use improved target structures and multi-stage acceleration to improve the proton/ion energy and accelerating efficiency. The possibility of energetic protons/ions from TNSA driving fast-ignition fusion will also be discussed. On the other hand， the project will perform theoretical researches to explore new novel accelerating schemes and applications， such as using lasers with high electro-optic efficiency， e.g. CO2 lasers， accelerating electrons and protons to drive fast-ignition fusion， multi-stage laser pressure acceleration of ions， proton beam driven wakefield acceleration of protons and using laser-accelerated electrons to produce X/γ ray sources.

Key Words：Energetic electron beam； Energetic proton

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