Recent development of PW laser and ion acceleration in SKL in SIOM
The recent developments of the PW laser system (SULF) and ion acceleration in State Key Laboratory (SKL) of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM) are introduced. A double beam image (DBI) technique is coupled in the two-stage accelerating mechanism to simultaneously improve the spectra and maximum energy of the proton beam. The cascaded shock acceleration mechanism and the cascaded TNSA mechanism work together to generate a proton beam with a narrow-spectrum center at 5.4 MeV and a long tail up to 14.4 MeV. Experimental and simulation results show that spatial collineation, time synchronization, and real-time monitoring are needed for optimum two-stage proton acceleration and are realized by the DBI technique to a certain extent in our experiment. Depending on DBI, the narrow spectral ion beam with low charge-to-mass (C2+) generated by triple-stage acceleration mechanism are also investigated by a simple numerical model and partially verified by the experiment. In addition, some new manipulations on particles are investigated by the Laguerre–Gaussian (LG) laser in the relativistic region, which are subverted from the classical tweezers, spanner, or wrench driven by the weak LG light or LG laser in previous studies.
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.
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