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We report the experimental results of the commissioning phase in the 10 PWlaser beamline of Shanghai Superintense Ultrafast Laser Facility (SULF). Thepeak power reaches 2.4 PW on target without the last amplifying during theexperiment. The laser energy of 72\pm 9 J is directed to a focal spot of ~6{\mu}m diameter (FWHM) in 30 fs pulse duration, yielding a focused peakintensity around 2.0 \times 10^{21} W/cm^2. First laser-proton accelerationexperiment is performed using plain copper and plastic targets. High-energyproton beams with maximum cut-off energy up to 62.5 MeV are achieved usingcopper foils at the optimum target thickness of 4 {\mu}m via target normalsheath acceleration (TNSA). For plastic targets of tens of nanometers thick,the proton cut-off energy is approximately 20 MeV, showing ring-like orfilamented density distributions. These experimental results reflect thecapabilities of the SULF-10 PW beamline, e.g., both ultrahigh intensity andrelatively good beam contrast. Further optimization for these key parameters isunderway, where peak laser intensities of 10^{22}-10^{23} W/cm^2 areanticipated to support various experiments on extreme field physics.

Acceleration of 60 MeV proton beams in the commissioning experiment of SULF-10 PW laser