| 1 | Acceleration of 60 MeV proton beams in the commissioning experiment of the SULF-10 PW laser显示文摘We report the experimental results of the commissioning phase in the 10 PW laser beamline of the Shanghai Superintense Ultrafast Laser Facility(SULF).The peak power reaches 2.4 PW on target without the last amplifying during the experiment.The laser energy of 72±9 J is directed to a focal spot of approximately 6μm diameter(full width at half maximum)in 30 fs pulse duration,yielding a focused peak intensity around 2.0×10^(21)W/cm^(2).The first laser-proton acceleration experiment is performed using plain copper and plastic targets.High-energy proton beams with maximum cut-off energy up to 62.5 MeV are achieved using copper foils at the optimum target thickness of 4μm via target normal sheath acceleration.For plastic targets of tens of nanometers thick,the proton cut-off energy is approximately 20 MeV,showing ring-like or flamented density distributions.These experimental results reflect the capabilities of the SULF-10 PW beamline,for example,both ultrahigh intensity and relatively good beam contrast.Further optimization for these key parameters is underway,where peak laser intensities of 10^(22)-10^(23)w/cm^(2)are anticipated to support various experiments on extreme field physics. | A.X.Li C.Y.Qin H.Zhang S.Li L.L.Fan Q.S.Wang T.J.Xu N.W.Wang L.H.Yu Y.Xu Y.Q.Liu C.Wang X.L.Wang Z.X.Zhang X.Y.Liu P.L.Bai Z.B.Gan X.B.Zhang X.B.Wang C.Fan Y.J.Sun Y.H.Tang B.Yao X.Y.Liang Y.X.Leng B.F.Shen L.L.Ji R.X.Li Z.Z.Xu | 2022 | High Power Laser Science and Engineering2022，10，4： | 2 |
| 2 | 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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