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  • Accelerated protons with energies up to 70 MeV based on the optimized SG-II Peta-watt laser facility

  • H. H. An, W. Wang, J. Xiong, C. Wang, X. Pan, X. P. Ouyang, S. Jiang, Z. Y. Xie, P. P. Wang, Y. L. Yao, N. Hua, Y. Wang, Z. C. Jiang, Q. Xiao, F. C. Ding, Y. T. Wan, X. Liu, R. R. Wang, Z. H. Fang, P. Q. Yang, Y. E. Jiang, P. Z. Zhang, B. Q. Zhu, J. R. Sun, B. Qiao, A. L. Lei, J. Q. Zhu
  • Journal:
    High Power Laser Science and Engineering / Volume 11 / 2023
    Published online by Cambridge University Press:
    30 June 2023, e63
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  • The target backsheath field acceleration mechanism is one of the main mechanisms of laser-driven proton acceleration (LDPA) and strongly depends on the comprehensive performance of the ultrashort ultra-intense lasers used as the driving sources. The successful use of the SG-II Peta-watt (SG-II PW) laser facility for LDPA and its applications in radiographic diagnoses have been manifested by the good performance of the SG-II PW facility. Recently, the SG-II PW laser facility has undergone extensive maintenance and a comprehensive technical upgrade in terms of the seed source, laser contrast and terminal focus. LDPA experiments were performed using the maintained SG-II PW laser beam, and the highest cutoff energy of the proton beam was obviously increased. Accordingly, a double-film target structure was used, and the maximum cutoff energy of the proton beam was up to 70 MeV. These results demonstrate that the comprehensive performance of the SG-II PW laser facility was improved significantly.