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Mass selection in laser-plasma ion accelerator on nanostructured surfaces

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Author(s)

  • Malay Dalui
  • M. Kundu
  • Subhrangsu Sarkar
  • Sheroy Tata
  • John Pasley
  • P. Ayyub
  • M. Krishnamurthy

Department/unit(s)

Publication details

JournalPhysics of Plasmas
DateAccepted/In press - 26 Dec 2016
DateE-pub ahead of print (current) - 17 Jan 2017
Issue number1
Volume24
Number of pages8
Pages (from-to)1-8
Early online date17/01/17
Original languageEnglish

Abstract

When an intense laser pulse interacts with a solid surface, ions get accelerated in the laser-plasma due to the formation of transient longitudinal electric field along the target normal direction. However, the acceleration is not mass-selective. The possibility of manipulating such ion acceleration scheme to enhance the energy of one ionic species (either proton or carbon) selectively over the other species is investigated experimentally using nanopore targets. For an incident laser intensity of approximately 5×1017 W/cm2, we show that the acceleration is optimal for protons when the pore diameter is about 15-20 nm, while carbon ions are optimally accelerated when the pore diameter is close to 40-50 nm. The observed effect is due to tailoring targetry by the pulse pedestal of the laser prior to the arrival of the main pulse.

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