Angle-dependent modulated spectral peaks of proton beams generated in ultrashort intense laser-solid interactions

L. N. Su, Z. D. Hu, Y. Zheng, M. Liu, Y. T. Li, W. M. Wang, Z. M. Sheng, X. H. Yuan, M. H. Xu, Z. W. Shen, H. T. Fan, L. M. Chen, X. Lu, J. L. Ma, X. Wang, Z. H. Wang, Z. Y. Wei, J. Zhang

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Proton acceleration from 4μm thick aluminum foils irradiated by 30-TW Ti:sapphire laser pulses is investigated using an angle-resolved proton energy spectrometer. We find that a modulated spectral peak at ∼0.82MeV is presented at 2.5° off the target normal direction. The divergence angle of the modulated zone is 3.8°. Two-dimensional particle-in-cell simulations reveal that self-generated toroidal magnetic field at the rear surface of the target foil is responsible for the modulated spectral feature. The field deflects the low energy protons, resulting in the modulated energy spectrum with certain peaks.

Original languageEnglish
Article number093111
Number of pages6
JournalPhysics of Plasmas
Issue number9
Publication statusPublished - 24 Sep 2014


  • spectral peak
  • intense laser
  • proton beams

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