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Fully polarized Compton scattering in plane waves and its polarization transfer
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作者 Suo Tang Yu Xin +2 位作者 Meng Wen Mamat Ali Bake baisong xie 《Matter and Radiation at Extremes》 SCIE EI CSCD 2024年第3期45-56,共12页
Fully polarized Compton scattering from a beam of spin-polarized electrons is investigated in plane-wave backgrounds in a broad intensity region from the perturbative to the nonperturbative regimes.In the perturbative... Fully polarized Compton scattering from a beam of spin-polarized electrons is investigated in plane-wave backgrounds in a broad intensity region from the perturbative to the nonperturbative regimes.In the perturbative regime,polarized linear Compton scattering is considered for investigating polarization transfer from a single laser photon to a scattered photon,and in the high-intensity region,the polarized locally monochromatic approximation and locally constant field approximation are established and are employed to study polarization transfer from an incoming electron to a scattered photon.The numerical results suggest an appreciable improvement of about 10%in the scattering probability in the intermediate-intensity region if the electron’s longitudinal spin is parallel to the laser rotation.The longitudinal spin of the incoming electron can be transferred to the scattered photon with an efficiency that increases with laser intensity and collisional energy.For collision between an optical laser with frequency1 eV and a 10 GeV electron,this polarization transfer efficiency can increase from about 20%in the perturbative regime to about 50%in the nonperturbative regime for scattered photons with relatively high energy. 展开更多
关键词 POLARIZED SCATTERED TRANSFER
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Enhancement of proton collimation and acceleration by an ultra-intense laser interacting with a cone target followed by a beam collimator
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作者 Yajuan HOU Li WANG +1 位作者 Haibo SANG baisong xie 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第4期76-84,共9页
A special method is proposed of a laser-induced cavity pressure acceleration scheme for collimating,accelerating and guiding protons,using a single-cone target with a beam collimator through a target normal sheath acc... A special method is proposed of a laser-induced cavity pressure acceleration scheme for collimating,accelerating and guiding protons,using a single-cone target with a beam collimator through a target normal sheath acceleration mechanism.In addition,the problems involved are studied by using two-dimensional particle-in-cell simulations.The results show that the proton beam can be collimated,accelerated and guided effectively through this type of target.Theoretically,a formula is derived for the combined electric field of accelerating protons.Compared with a proton beam without a beam collimator,the proton beam density and cut-off energy of protons in the type II are increased by 3.3 times and 10%respectively.Detailed analysis shows that the enhancement is mainly due to the compact and strong sheath electrostatic field,and that the beam collimator plays a role in focusing energy.In addition,the simulation results show that the divergence angle of the proton beam in type II is less than 1.67 times that of type I.The more prominent point is that the proton number of type II is 2.2 times higher than that of type I.This kind of target has important applications in many fields,such as fast ion ignition in inertial fusion,high energy physics and proton therapy. 展开更多
关键词 single-cone TARGET with BEAM COLLIMATOR TARGET normal SHEATH ACCELERATION mechanism(TNSAM) particle-in-cell(PIC) SHEATH static electric field(SSEF) inertial fusion high energy physics and PROTON therapy PROTON BEAM density cut-off energy of PROTON
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High density γ-ray emission and dense positron production via multi-laser driven circular target
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作者 Yajuan HOU baisong xie +5 位作者 Chong LV Feng WAN Li WANG Nureli YASEN Haibo SANG and Guoxing XIA 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第8期34-42,共9页
A diamond-like carbon circular target is proposed to improve γ-ray emission and pair production with a laser intensity of 8×1022 W cm-2by using 2D particle-in-cell simulations with quantum electrodynamics.It is ... A diamond-like carbon circular target is proposed to improve γ-ray emission and pair production with a laser intensity of 8×1022 W cm-2by using 2D particle-in-cell simulations with quantum electrodynamics.It is found that the circular target can enhance the density of γ-photons significantly more than a plane target, when two colliding circularly polarized lasers irradiate the target.By multi-laser irradiating the circular target, the optical trap of lasers can prevent the high energy electrons accelerated by laser radiation pressure from escaping.Hence, γ-photons with a high density of beyond 5000 ncare obtained through nonlinear Compton backscattering.Meanwhile, 2.7×1011 positrons with an average energy of 230 MeV are achieved via the multiphoton Breit-Wheeler process.Such an ultrabright γ-ray source and dense positron source can be useful in many applications.The optimal target radius and laser mismatching deviation parameters are also discussed in detail. 展开更多
关键词 e+e-pairs PRODUCTION Γ-RAY EMISSION Breit-Wheeler(BW) PROCESS Compton backscattering(NCBS) PROCESS particle-in-cell(PIC)
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Dense positrons and γ-rays generation by lasers interacting with convex target
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作者 Nureli YASEN baisong xie Weiyuan LIU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第1期23-31,共9页
We use quantum electrodynamics particle-in-cell simulation to study the generation of dense electron–positron plasma and strongγ-ray bursts in counter-propagating laser beam interactions with two different solid tar... We use quantum electrodynamics particle-in-cell simulation to study the generation of dense electron–positron plasma and strongγ-ray bursts in counter-propagating laser beam interactions with two different solid targets,i.e.planar(type I)and convex(type II).We find that type II limits fast electron flow most effectively.while the photon density is increased by about an order of magnitude and energy by approx.10%–20%compared with those in type I target.γ-photon source with an ultrahigh peak brilliance of 2?×?1025 photons/s/mm2/mrad2/0.1%BW is generated by nonlinear Compton scattering process.Furthermore,use of type II target increases the positron density and energy by 3 times and 32%respectively,compared with those in type I target.In addition,the conversion efficiencies of total laser energy toγ-rays and positrons of type II are improved by 13.2%and 9.86%compared with type I.Such improvements in conversion efficiency and positron density are envisaged to have practical applications in experimental field. 展开更多
关键词 electron-positron pairs γ-rays particle-in-cell(PIC) nonlinear Compton scattering(NCS) multi-photon Breit-Wheeler proces quantum electrodynamics generation of dense electron-positron plasma
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Ultrabright γ-ray emission from the interaction of an intense laser pulse with a near-critical-density plasma
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作者 Aynisa Tursun Mamat Ali Bake +2 位作者 baisong xie Yasheng Niyazi Abuduresuli Abudurexiti 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期419-429,共11页
An efficient scheme for generating ultrabright γ-rays from the interaction of an intense laser pulse with a near-criticaldensity plasma is studied by using the two-dimensional particle-in-cell simulation including qu... An efficient scheme for generating ultrabright γ-rays from the interaction of an intense laser pulse with a near-criticaldensity plasma is studied by using the two-dimensional particle-in-cell simulation including quantum electrodynamic effects.We investigate the effects of target shape on γ-ray generation efficiency using three configurations of the solid foils attached behind the near-critical-density plasma:a flat foil without a channel(target 1),a flat foil with a channel(target 2),and a convex foil with a channel(target 3).When an intense laser propagates in a near-critical-density plasma,a large number of electrons are trapped and accelerated to GeV energy,and emit γ-rays via nonlinear betatron oscillation in the first stage.In the second stage,the accelerated electrons collide with the laser pulse reflected from the foil and emit high-energy,high-density γ-rays via nonlinear Compton scattering.The simulation results show that compared with the other two targets,target 3 affords better focusing of the laser field and electrons,which decreases the divergence angle of g-photons.Consequently,denser and brighter γ-rays are emitted when target 3 is used.Specifically,a dense γ-ray pulse with a peak brightness of 4.6×10^(26) photons/s/mm2/mrad2/0.1%BW(at 100 MeV)and 1.8×1023 photons/s/mm2/mrad2/0.1%BW(at 2 GeV)are obtained at a laser intensity of 8.5×10^(22) W/cm2 when the plasma density is equal to the critical plasma density nc.In addition,for target 3,the effects of plasma channel length,foil curvature radius,laser polarization,and laser intensity on the γ-ray emission are discussed,and optimal values based on a series of simulations are proposed. 展开更多
关键词 electron acceleration γ-ray emission inverse Compton scattering near-critical-density plasma 2D-QED-PIC simulation
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Brightγ-ray source with large orbital angular momentum from the laser near-criticalplasma interaction
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作者 Mamat Ali BAKE Suo TANG baisong xie 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第9期15-23,共9页
We propose a new laser-plasma-based method to generate brightγ-rays carrying large orbital angular momentum by interacting a circularly polarized Laguerre–Gaussian laser pulse with a near-critical hydrogen plasma co... We propose a new laser-plasma-based method to generate brightγ-rays carrying large orbital angular momentum by interacting a circularly polarized Laguerre–Gaussian laser pulse with a near-critical hydrogen plasma conflned in an over-dense solid tube.In the flrst stage of the interaction,it is found via fully relativistic three-dimensional particle-in-cell simulations that high-energy helical electron beams with large orbital angular momentum are generated.In the second stage,this electron beam interacts with the laser pulse reflected from the plasma disc behind the solid tube,and helicalγbeams are generated with the same topological structure as the electron beams.The results show that the electrons receive angular momentum from the drive laser,which can be further transferred to theγphotons during the interaction.Theγbeam orbital angular momentum is strongly dependent on the laser topological charge l and laser intensity a_(0),which scales as L_(γ)∝a_(0)~4.A short(duration of 5 fs)isolated helicalγbeam with an angular momentum of-3.3×10^(-14)kg m~2 s^(-1)is generated using the Laguerre–Gaussian laser pulse with l=2.The peak brightness of the helicalγbeam reaches 1.22×10^(24)photons s^(-1)mm^(-2)mrad^(-2)per 0.1%BW(at 10 Me V),and the laser-to-γ-ray angular momentum conversion rate is approximately 2.1%. 展开更多
关键词 laser plasma interaction Laguerre–Gaussian laser γ-ray emission orbital angular momentum particle-in-cell simulation
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Two-stage γ ray emission via ultrahigh intensity laser pulse interaction with a laser wakefield accelerated electron beam
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作者 Mamat Ali BAKE Aynisa TURSUN +1 位作者 Aimierding AIMIDULA baisong xie 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第10期76-85,共10页
In this study, we investigate the generation of twin γ ray beams in the collision of an ultrahigh intensity laser pulse with a laser wakefield accelerated electron beam using a particle-in-cell simulation. We conside... In this study, we investigate the generation of twin γ ray beams in the collision of an ultrahigh intensity laser pulse with a laser wakefield accelerated electron beam using a particle-in-cell simulation. We consider the composed target of a homogeneous underdense preplasma in front of an ultrathin solid foil. The electrons in the preplasma are trapped and accelerated by the wakefield. When the laser pulse is reflected by the thin solid foil, the wakefield accelerated electrons continue to move forward and pass through the foil almost without influence from the reflected laser pulse or foil. Consequently, two groups of γ ray flashes, with tunable time delay and energy, are generated by the wakefield accelerated electron beam interacting with the reflected laser pulse from the foil as well as another counter-propagating petawatt laser pulse behind the foil. Additionally, we study the dependence of the γ photon emission on the preplasma densities, driving laser polarization, and solid foil. 展开更多
关键词 laser plasma interaction wakefield acceleration γray emission particle-in-cell(PIC)simulation
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Enhanced photon emission and pair production in laser-irradiated plasmas
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作者 Feng WAN Chong LV +1 位作者 Moran JIA baisong xie 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第7期34-39,共6页
Enhanced photon emission and pair production due to heavy ion mass in the interaction of an ultraintense laser with overdense plasmas is explored by particle-in-cell simulation. It is found that plasmas with heavier i... Enhanced photon emission and pair production due to heavy ion mass in the interaction of an ultraintense laser with overdense plasmas is explored by particle-in-cell simulation. It is found that plasmas with heavier ion mass can excite a higher and broader electrostatic field, which causes the enhancement of backward photon emission. The pair yields are then enhanced due to the increase of backwards photons colliding with the incoming laser pulse. By examining the density evolution and angle distribution of each particle species, the origin of pair yield enhancement is clarified. 展开更多
关键词 laser-plasma interaction physics /-ray and particle generation positron emission PIC simulation
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