Ion acceleration in multispecies targets driven by intense laser radiation pressure.
/ Authors
S. Kar, K. Kakolee, Bin Qiao, Andrea Macchi, M. Cerchez, Domenico Doria, Michael Geissler, Paul McKenna, D. Neely, J. Osterholz
and 9 more authors
Rajendra Prasad, K. Quinn, B. Ramakrishna, G. Sarri, O. Willi, X. Yuan, M. Zepf, M. Zepf, M. Borghesi
/ Abstract
The acceleration of ions from ultrathin foils has been investigated by using 250 TW, subpicosecond laser pulses, focused to intensities of up to 3 × 10(20) W cm(-2). The ion spectra show the appearance of narrow-band features for protons and carbon ions peaked at higher energies (in the 5-10 MeV/nucleon range) and with significantly higher flux than previously reported. The spectral features and their scaling with laser and target parameters provide evidence of a multispecies scenario of radiation pressure acceleration in the light sail mode, as confirmed by analytical estimates and 2D particle-in-cell simulations. The scaling indicates that monoenergetic peaks with more than 100 MeV/nucleon are obtainable with moderate improvements of the target and laser characteristics, which are within reach of ongoing technical developments.
Journal: Physical review letters