| 1 | Mapping non-laminar proton acceleration in laser-driven target normal sheath field显示文摘We report on experimental observation of non-laminar proton acceleration modulated by a strong magnetic field in laser irradiating micrometer aluminum targets.The results illustrate the coexistence of ring-like and filamentation structures.We implement the knife edge method into the radiochromic film detector to map the accelerated beams,measuring a source size of 30-110μm for protons of more than 5 MeV.The diagnosis reveals that the ring-like profile originates from low-energy protons far off the axis whereas the filamentation is from the near-axis high-energy protons,exhibiting non-laminar features.Particle-in-cell simulations reproduced the experimental results,showing that the short-term magnetic turbulence via Weibel instability and the long-term quasi-static annular magnetic field by the streaming electric current account for the measured beam profile.Our work provides direct mapping of laser-driven proton sources in the space-energy domain and reveals the non-laminar beam evolution at featured time scales. | C.Y.Qin H.Zhang S.Li S.H.Zhai A.X.Li J.Y.Qian J.Y.Gui F.X.Wu Z.X.Zhang Y.Xu X.Y.Liang Y.X.Leng B.F.Shen L.L.Ji R.X.Li | 2022 | High Power Laser Science and Engineering2022，10，1： | 0 |
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