Double-Relativistic-Electron-Layer Proton Acceleration with High-Contrast Circular-Polarization Laser Pulses
HUANG Yong-Sheng1,2**, WANG Nai-Yan1, TANG Xiu-Zhang1, SHI Yi-Jin1, ZHANG Shan3
1High Power Excimer Laser Laboratory, China Institute of Atomic Energy, Beijing 102413 2Department of Engineering Physics, Tsinghua University, Beijing 100084 3Department of Physics, Beijing Normal University, Beijing 100875
Abstract：A new laser-proton acceleration scheme consisting of two relativistic electron layers, a suprathermal electron layer and a thermal electron cloud is proposed for a0?80σ0, where a0 is the normalized laser field and σ0 is the normalized plasma surface density. This is essentially different from target normal sheath acceleration and radiation pressure acceleration. The persistent opaqueness of the first relativistic electron layer for the incident circular-polarization laser pulse and electron recirculation are key points in forming the new acceleration scheme. A proton beam with a uniform energy distribution in the energy range 1–2 GeV and a monoenergetic proton beam with hundreds of MeV have been predicted for a0=39.5.
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2013, Vol. 30 
