Scientific Results

High energy implementation of coil‐target scheme for guided
re‐acceleration of laser‐driven protons

Year: 2021

Authors: Ahmed H., Hadjisolomou P., Naughton K., Alejo A., Brauckmann S., Cantono G., Ferguson S., Cerchez M., Doria D., Green J., Gwynne D., Hodge T., Kumar D., Macchi A., Prasad R., Willi O., Borghesi M., Kar S.

Autors Affiliation: 1) School of Mathematics and Physics, Queen’s University Belfast, Belfast BT71NN, UK.
2) Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK.
3) Institute of Physics of the ASCR, ELI-Beamlines
Project, Na Slovance 2, 18221 Prague, Czech Republic.
4) Institute for Laser and Plasma Physics, University of Düsseldorf, Düsseldorf, Germany.
5) Dipartimento di Fisica Enrico Fermi, Università di Pisa, Pisa, Italy.
6) Extreme Light Infrastructure (ELI-NP) and Horia Hulubei National Institute for R & D in Physics and Nuclear Engineering (IFIN-HH), Reactorului No. 30, 077125 Magurele, Bucharest, Romania.
7) National Research Council, National
Institute of Optics (CNR/INO), Research Unit “Adriano Gozzini”, Pisa, Italy.

Abstract: Developing compact ion accelerators using intense lasers is a very active area of research, motivated
by a strong applicative potential in science, industry and healthcare. However, proposed applications
in medical therapy, as well as in nuclear and particle physics demand a strict control of ion energy,
as well as of the angular and spectral distribution of ion beam, beyond the intrinsic limitations of
the several acceleration mechanisms explored so far. Here we report on the production of highly
collimated ( ∼ 0.2 ◦ half angle divergence), high-charge (10s of pC) and quasi-monoenergetic proton
beams up to ∼ 50 MeV, using a recently developed method based on helical coil targetry. In this
concept, ions accelerated from a laser-irradiated foil are post-accelerated and conditioned in a helical
structure positioned at the rear of the foil. The pencil beam of protons was produced by guided
post-acceleration at a rate of ∼ 2 GeV/m, without sacrificing the excellent beam emittance of the
laser-driven proton beams. 3D particle tracing simulations indicate the possibility of sustaining
high acceleration gradients over extended helical coil lengths, thus maximising the gain from such
miniature accelerating modules.


Volume: 11      Pages from: 699-1  to: 699-7

KeyWords: laser-plasma acceleration
DOI: 10.1038/s41598-020-77997-w