• High Power Laser Science and Engineering
  • Vol. 12, Issue 6, 06000e88 (2024)
P. Martin1,*, H. Ahmed1,2, O. Cavanagh1, S. Ferguson1..., J. S. Green2, B. Greenwood1, B. Odlozilik1, M. Borghesi1 and S. Kar1|Show fewer author(s)
Author Affiliations
  • 1Centre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
  • 2Central Laser Facility, Rutherford Appleton Laboratory, Didcot, UK
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    DOI: 10.1017/hpl.2024.64 Cite this Article Set citation alerts
    P. Martin, H. Ahmed, O. Cavanagh, S. Ferguson, J. S. Green, B. Greenwood, B. Odlozilik, M. Borghesi, S. Kar, "Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets," High Power Laser Sci. Eng. 12, 06000e88 (2024) Copy Citation Text show less

    Abstract

    Tightly focused proton beams generated from helical coil targets have been shown to be highly collimated across small distances, and display characteristic spectral bunching. We show, for the first time, proton spectra from such targets at high resolution via a Thomson parabola spectrometer. The proton spectral peaks reach energies above 50 MeV, with cutoffs approaching 70 MeV and particle numbers greater than 10 ${}^{10}$ . The spectral bunch width has also been measured as low as approximately 8.5 MeV (17% energy spread). The proton beam pointing and divergence measured at metre-scale distances are found to be stable with the average pointing stability below 10 mrad, and average half-angle beam divergences of approximately 6 mrad. Evidence of the influence of the final turn of the coil on beam pointing over long distances is also presented, corroborated by particle tracing simulations, indicating the scope for further improvement and control of the beam pointing with modifying target parameters.
    pr=2πβz2βEM2βz2, ((1))

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    P. Martin, H. Ahmed, O. Cavanagh, S. Ferguson, J. S. Green, B. Greenwood, B. Odlozilik, M. Borghesi, S. Kar, "Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets," High Power Laser Sci. Eng. 12, 06000e88 (2024)
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