Dynamic control of laser driven proton beams by exploiting self-generated, ultrashort electromagnetic pulses

S. Kar, H. Ahmed, G. Nersisyan, S. Brauckmann, F. Hanton, A. L. Giesecke, K. Naughton, O. Willi, C. L. S. Lewis, M. Borghesi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
327 Downloads (Pure)

Abstract

As part of the ultrafast charge dynamics initiated by high intensity laser irradiations of solid targets,high amplitude EM pulses propagate away from the interaction point and are transported along anystalks and wires attached to the target. The propagation of these high amplitude pulses along a thinwire connected to a laser irradiated target was diagnosed via the proton radiography technique,measuring a pulse duration of 20 ps and a pulse velocity close to the speed of light. The strongelectric field associated with the EM pulse can be exploited for controlling dynamically the protonbeams produced from a laser-driven source. Chromatic divergence control of broadband laser drivenprotons (upto 75% reduction in divergence of >5 MeV protons) was obtained by winding the supportingwire around the proton beam axis to create a helical coil structure. In addition to providingfocussing and energy selection, the technique has the potential to post-accelerate the transiting protonsby the longitudinal component of the curved electric field lines produced by the helical coil lens.
Original languageEnglish
Article number055711
Number of pages6
JournalPhysics of Plasmas
Volume23
Issue number5
DOIs
Publication statusPublished - 27 May 2016

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