The emergence of multi-petawatt laser facilities is expected to push forward the maximum energy gain that can be achieved in a single stage of a laser wakefield acceleration(LWFA)to tens of giga-electron volts,which b...The emergence of multi-petawatt laser facilities is expected to push forward the maximum energy gain that can be achieved in a single stage of a laser wakefield acceleration(LWFA)to tens of giga-electron volts,which begs the question-is it likely to impact particle physics by providing a truly compact particle collider?Colliders have very stringent requirements on beam energy,acceleration efficiency,and beam quality.In this article,we propose an LWFA scheme that can for the first time simultaneously achieve hitherto unrealized acceleration efficiency from the laser to the electron beam of>20%and a sub-1%energy spread using a stepwise plasma structure and a nonlinearly chirped laser pulse.Three-dimensional high-fidelity simulations show that the nonlinear chirp can effectively mitigate the laser waveform distortion and lengthen the acceleration distance.This,combined with an interstage rephasing process in the stepwise plasma,can triple the beam energy gain compared to that in a uniform plasma for a fixed laser energy,thereby dramatically increasing the efficiency.A dynamic beam loading effect can almost perfectly cancel the energy chirp that arises during the acceleration,leading to the sub-percent energy spread.This scheme is highly scalable and can be applied to petawatt LWFA scenarios.Scaling laws are obtained,which suggest that electron beams with parameters relevant for a Higgs factory could be reached with the proposed high-efficiency,low-energy-spread scheme.展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(grant nos.XDB0530000 and XDB0530100)National Natural Science Foundation of China(grant nos.11991071,12375241,12305152,and 11991073)+3 种基金Discipline Construction Foundation of“Double World-class Project,”and was funded in part by the National Science and Technology Major Project(grant no.2019-VII-0019-0161)C.J.and W.B.M.were partially supported by U.S.DoE grant DE-SC0010064:0011W.B.M.was also partially supported by U.S.NSF grant 2108970The simulation work is supported by Center of High Performance Computing,Tsinghua University.
文摘The emergence of multi-petawatt laser facilities is expected to push forward the maximum energy gain that can be achieved in a single stage of a laser wakefield acceleration(LWFA)to tens of giga-electron volts,which begs the question-is it likely to impact particle physics by providing a truly compact particle collider?Colliders have very stringent requirements on beam energy,acceleration efficiency,and beam quality.In this article,we propose an LWFA scheme that can for the first time simultaneously achieve hitherto unrealized acceleration efficiency from the laser to the electron beam of>20%and a sub-1%energy spread using a stepwise plasma structure and a nonlinearly chirped laser pulse.Three-dimensional high-fidelity simulations show that the nonlinear chirp can effectively mitigate the laser waveform distortion and lengthen the acceleration distance.This,combined with an interstage rephasing process in the stepwise plasma,can triple the beam energy gain compared to that in a uniform plasma for a fixed laser energy,thereby dramatically increasing the efficiency.A dynamic beam loading effect can almost perfectly cancel the energy chirp that arises during the acceleration,leading to the sub-percent energy spread.This scheme is highly scalable and can be applied to petawatt LWFA scenarios.Scaling laws are obtained,which suggest that electron beams with parameters relevant for a Higgs factory could be reached with the proposed high-efficiency,low-energy-spread scheme.
