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Chinese Physics B 2017年第6期26卷 234-243页

作者：洪学仁周伟军谢柏松杨阳王莉田建民唐荣安段文山 Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal University College of Nuclear Science and Technology Beijing Normal University

In order to generate high quality ion beams through the stable radiation pressure acceleration（RPA） of the near critical density（NCD） target, we propose a new type of target where an ultra-thin high density（HD） layer is attached to the front surface of an NCD target, which has a preferable self-supporting property in the RPA experiments than the ultra-thin foil target. It is found that in one-dimensional particle-in-cell（PIC） simulation, by the block of the HD layer in the new target,there emerges the hole-boring process rather than propagation in the NCD layer when the intense laser pulse impinges on this target. As a result, a typical RPA structure that the compressed electron layer overlaps the ion layer as a whole is formed and a high quality ion beam is obtained, e.g., a circularly polarized laser pulse with normalized amplitude a0= 120 impinges on this new target and a 1.2 GeV monoenergetic ion beam is generated through the RPA of the NCD layer. Similar results are also found in the two-dimensional PIC simulation.

关键词： laser plasma interaction radiation pressure acceleration near critical density target

Optimization of hole-boring radiation pressure acceleration of ion beams for fusion ignition

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Matter and radiation at Extremes 2018年第1期3卷 28-39页

作者： S.M.Weng Z.M.Sheng M.Murakami M.Chen M.Liu H.C.Wang T.Yuan J.Zhang Key Laboratory for Laser Plasmas(MoE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China SUPA Department of PhysicsUniversity of StrathclydeGlasgow G40NGUK Institute of Laser Engineering Osaka UniversityOsaka 565-0871Japan

In contrast to ion beams produced by conventional accelerators,ion beams accelerated by ultrashort intense laser pulses have advantages of ultrashort bunch duration and ultrahigh density,which are achieved in compact ***,it is still challenging to simultaneously enhance their quality and yield for practical applications such as fast ion ignition of inertial confinement *** with other mechanisms of laser-driven ion acceleration,the hole-boring radiation pressure acceleration has a special advantage in generating high-fluence ion beams suitable for the creation of high energy density state of *** this paper,we present a review on some theoretical and numerical studies of the hole-boring radiation pressure *** we discuss the typical field structure associated with this mechanism,its intrinsic feature of oscillations,and the underling *** we will review some recently proposed schemes to enhance the beam quality and the efficiency in the hole-boring radiation pressure acceleration,such as matching laser intensity profile with target density profile,and using two-ion-species *** on this,we propose an integrated scheme for efficient high-quality hole-boring radiation pressure acceleration,in which the longitudinal density profile of a composite target as well as the laser transverse intensity profile are tailored according to the matching condition.

关键词： Laser-driven ion acceleration radiation pressure acceleration Fast ignition Inertial confinement fusion High energy density Hole boring

acceleration of Protons from a Double-Layer or Multi-Ion-Mixed Foil Irradiated by Ultraintense Lasers

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Plasma Science and Technology 2010年第3期12卷 277-283页

作者：王伟民盛政明於陆勒李玉同 KAWATA Shigeo 张杰 Beijing National Laboratory of Condensed Matter Physics Institute of PhysicsCAS Graduate School of Engineering Utsunomiya University Department of Physics Shanghai Jiao Tong University

acceleration of protons by the radiation pressure of a circularly polarized laser pulse with the intensity up to 1021 W/cm^2 from a double-layer or multi-ion-mixed thin foil is investigated by two-dimensional particle-in-cell simulations. The double-layer foil is composed of a heavy ion layer and a proton layer. It is found that the radiation pressure acceleration can be classified into three regimes according to the laser intensity due to the different critical intensities for laser transparency with different ion species. When the laser intensity is moderately high, the laser pushes the electrons neither so slowly nor so quickly that the protons can catch up with the electrons, while the heavy ions cannot. Therefore, the protons can be accelerated efficiently. The proton beam generated from the double-layer foil is of better quality and higher energy than that from a pure proton foil with the same areal electron density. When the laser intensity is relatively low, both the protons and heavy ions are accelerated together, which is not favorable to the proton acceleration. When the laser intensity is relatively high, neither the heavy ions nor the protons can be accelerated efficiently due to the laser transparency through the target.

关键词： ion acceleration radiation pressure acceleration intense laser foil interaction particle-in-cell simulation

Suppression of multiple ion bunches and generation of monoenergetic ion beams in laser foil-plasma

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Chinese Physics B 2011年第1期20卷 479-485页

作者：张闪谢柏松洪学仁吴海城艾米尔丁.艾米都拉赵学燕刘明萍 College of Nuclear Science and Technology Beijing Normal University Department of Mathematics and Physics Shijiazhuang Tiedao University College of Physics and Electronic Engineering Northwest Normal University School of Information Engineering Nanchang University

In one-dimensional particle-in-cell simulations, this paper shows that the formation of multiple ion bunches is disadvantageous to the generation of monoenergetic ion beams and can be suppressed by choosing an optimum target thickness in the radiation pressure acceleration mechanism by a circularly polarised laser pulse. As the laser pulse becomes intense, the optimum target thickness obtained by a non-relativistic treatment is no longer adequate. Considering the relativistic Doppler-shifted pressure, it proposes a relativistic formulation to determine the optimum target thickness. The theoretical predictions agree with the simulation results well. The model is also valid for two-dimensional cases. The accelerated ion beams can be compelled to be more stable by choosing the optimum target thickness when they exhibit some unstable behaviours.

关键词： interaction of ultrastrong laser pulse and plasma radiation pressure acceleration optimum target thickness

Effects of Ions Charge-Mass Ratio on Energy and Energy Spread of Accelerated Ions in Laser Driven Plasma

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Communications in Theoretical Physics 2013年第2期59卷 205-212页

作者：桑海波郑世强谢柏松 Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education Beijing Normal University College of Nuclear Science and Technology

Effects of ions charge-mass ratio on energy and energy spread of accelerated ions in laser driven plasma are investigated in detail by proposing a simple double-layer model for a foil target driven by an ultrastrong laser. The radiation pressure acceleration mechanism plays an important role on the studied problem. For the ions near the plasma mirror, i.e. electrons layer, the dependence of ions energy on their charge-mass ratio is derived theoretically. It is found that the larger the charge-mass ratio is, the higher the accelerated ions energy gets. For those ions far away from the layer, the dependence of energy and energy spread on ions charge-mass ratio are also obtained by numerical performance. It exhibits that, as ions charge-mass ratio increases, not only the accelerated ions energy but also the energy spread will become large.

关键词： laser driven plasma radiation pressure acceleration ions charge-mass ratio