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Controlled transport and focusing of laser-accelerated protons with miniature magnetic devices
Authors:Schollmeier M  Becker S  Geissel M  Flippo K A  Blazević A  Gaillard S A  Gautier D C  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
Institution:Institut für Kernphysik, Technische Universit?t Darmstadt, Schlossgartenstrasse 9, Darmstadt, Germany.
Abstract:This Letter demonstrates the transporting and focusing of laser-accelerated 14 MeV protons by permanent magnet miniature quadrupole lenses providing field gradients of up to 500 T/m. The approach is highly reproducible and predictable, leading to a focal spot of (286 x 173) microm 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 are perfectly applicable for upcoming high-energy, high-repetition rate laser systems.
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