Controlled transport and focusing of laser-accelerated protons with miniature magnetic devices

Controlled transport and focusing of laser-accelerated protons with miniature magnetic devices

Schollmeier, M.; Becker, S.; Geißel, M.; Flippo, K. A.; Blazevic, A.; Gaillard, S. A.; Cort Gautier, D.; Grüner, F.; Harres, K.; Kimmel, M.; Nürnberg, F.; Rambo, P.; Schramm, U.; Schreiber, J.; Schütrumpf, J.; Schwarz, J.; Tahir, N. A.; Atherton, B.; Habs, D.; Hegelich, B. M.; Roth, M.

This letter demonstrates the transporting and focusing of laser-accelerated 14 MeV protons by permanent magnet mini quadrupole lenses providing field gradients as high as 500 T/m. The approach is highly reproducible and predictable, leading to a focal spot of (286 × 173) μm full width at half maximum 50 cm behind the source. It decouples the relativistic laser-proton acceleration from the beam transport, paving the way to optimize both separately. The collimation and the subsequent energy selection obtained is perfectly applicable for upcoming high-energy high-repetition rate laser systems.

Keywords: Laser ion acceleration; beam focusing; permanent magnets; miniature magnetic lenses; PACS numbers: 41.75.Jv,52.38.Kd,41.85.Lc,52.59.-f

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