The accelerating gradient of a proton beam is crucial for stable radiation pressure acceleration
(RPA) because the multi-dimensional instabilities increase γ times slower in the relativistic region.
In this paper, a shape-tailored laser is proposed to significantly accelerate the ions in a controllable
high accelerating gradient. In this method, the fastest ions initially rest in the middle of the foil are
controlled to catch the compressed electron layer at the end of the hole-boring stage, thus the
light-sail stage can start as soon as possible. Then the compressed electron layer is accelerated
tightly together with the fastest ions by the shaped laser intensity, which further increases the
accelerating gradient in the light-sail stage. Such tailored pulse may be beneficial for the RPA
driven by the 10-fs 10 petawatt laser in the future.
W. P. Wang, B. F. Shen, and Z. Z. Xu, "Accelerating gradient improvement using shape-tailor laser front in radiation pressure acceleration progress," Proc. SPIE 10240, Laser Acceleration of Electrons, Protons, and Ions IV, 102400H (Presented at SPIE Optics + Optoelectronics: April 24, 2017; Published: 7 May 2017); https://doi.org/10.1117/12.2264785.
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