超強(qiáng)光場(chǎng)驅(qū)動(dòng)的高性能高能粒子束的產(chǎn)生及其應(yīng)用開拓研究

王乃彥++沈百飛++陸元榮

摘 要：超短超強(qiáng)激光驅(qū)動(dòng)等離子體，可獲得電子能量高達(dá)1GeV、質(zhì)子能量高達(dá)60MeV的高性能粒子束，從而在高能加速器、聚變物理、短脈沖高亮度X光源產(chǎn)生、實(shí)現(xiàn)小型化自由電子激光等領(lǐng)域都有重大的應(yīng)用價(jià)值。該研究主要研究利用超短超強(qiáng)激光在等離子體中形成穩(wěn)定的特殊三維尾波結(jié)構(gòu)，即空泡，實(shí)現(xiàn)單能電子加速。采用兩種控制電子注入的方法，即兩束激光對(duì)打和納米細(xì)絲擾動(dòng)，來提高電子加速的穩(wěn)定性，并控制高能電子的數(shù)量和能量。該研究還將通過改變激光傳輸方向的等離子體密度，來改變空泡中縱向加速靜電場(chǎng)的梯度，從而抵消高能電子束本身電荷分離場(chǎng)的梯度，以提高電子束的性能；還將研究高能電子束的細(xì)致結(jié)構(gòu)，并考慮其可能的重大應(yīng)用。該研究將利用靶后鞘層加速實(shí)現(xiàn)質(zhì)子加速，并將利用多層靶來提高加速效率，利用微結(jié)構(gòu)靶獲得準(zhǔn)單能質(zhì)子束，同時(shí)研究獲得高性能高能離子束的其他有效途徑。

關(guān)鍵詞：高能電子束 高能質(zhì)子束 超短超強(qiáng)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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