Predominant contribution of direct laser acceleration to high-energy electron spectra in a low-density self-modulated laser wakefield accelerator
Predominant contribution of direct laser acceleration to high-energy electron spectra in a low-density self-modulated laser wakefield accelerator
复制标题
低密度自调制激光尾场加速器中直接激光加速对高能电子谱的主要贡献
DOI：
10.1103/physrevaccelbeams.24.011302
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发表时间：
2021
影响因子：
1.7
通讯作者：
Joshi, C.
中科院分区：
文献类型：
--
作者：
King, P. M.;Miller, K.;Lemos, N.;Shaw, J. L.;Kraus, B. F.;Thibodeau, M.;Hegelich, B. M.;Hinojosa, J.;Michel, P.;Joshi, C.
在低密度自调制激光韦克菲尔德加速器（SM-LWFA）中，观测到了电子能量约为100 MeV时的两温相对论电子能谱。当电子被分散成与激光偏振方向正交时，它们在60 MeV以上的光谱显示出直接激光加速（DLA）的分叉结构特征。用准3Dosiris方法模拟了1 ps中等振幅激光脉冲与低密度等离子体的相互作用，再现了两温度分布和分叉结构。粒子跟踪表明，虽然SM-LWFA机制在40 MeV以下占主导地位，但最高能量（）的电子通过DLA获得大部分能量。通过将模拟的电场分离成模式，DLA主导的电子被示出从紧密聚焦几何结构向纵向激光场损失显著的能量，从而导致比先前可能的更准确的净DLA能量增益的测量。
The two-temperature relativistic electron spectrum from a low-density () self-modulated laser wakefield accelerator (SM-LWFA) is observed to transition between temperatures ofandat an electron energy of about 100 MeV. When the electrons are dispersed orthogonally to the laser polarization, their spectrum above 60 MeV shows a forking structure characteristic of direct laser acceleration (DLA). Both the two-temperature distribution and the forking structure are reproduced in a quasi-3Dosirissimulation of the interaction of the 1-ps, moderate-amplitude () laser pulse with the low-density plasma. Particle tracking shows that while the SM-LWFA mechanism dominates below 40 MeV, the highest-energy () electrons gain most of their energy through DLA. By separating the simulated electric fields into modes, the DLA-dominated electrons are shown to lose significant energy to the longitudinal laser field from the tight focusing geometry, resulting in a more accurate measure of net DLA energy gain than previously possible.
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影响因子：
2.2
作者：
Xi Zhang;V. Khudik;A. Pukhov;G. Shvets
通讯作者：
Xi Zhang;V. Khudik;A. Pukhov;G. Shvets
影响因子：
6.3
作者：
Li, Fei;Miller, Kyle G.;Mori, Warren B.
通讯作者：
Mori, Warren B.
影响因子：
3.3
作者：
L. Willingale;A. Arefiev;G. Williams;G. Williams;Hui-Hwa Chen;F. Dollar;A. Hazi;A. Maksimchuk;M. Manuel;E. Marley;E. Marley;W. Nazarov;T. Zhao;C. Zulick
通讯作者：
L. Willingale;A. Arefiev;G. Williams;G. Williams;Hui-Hwa Chen;F. Dollar;A. Hazi;A. Maksimchuk;M. Manuel;E. Marley;E. Marley;W. Nazarov;T. Zhao;C. Zulick
影响因子：
8.6
作者：
TAJIMA, T;DAWSON, JM
通讯作者：
DAWSON, JM
影响因子：
2.2
作者：
Lemos, N.;Albert, F.;Joshi, C.
通讯作者：
Joshi, C.