Laser acceleration of monoenergetic protons via a double layer emerging from an ultra-thin foil

Bengt Eliasson, Chuan S. Liu, Xi Shao, Roald Z. Sagdeev, Padma K. Shukla

Research output: Contribution to journalArticle

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Abstract

We present theoretical and numerical studies of the acceleration of monoenergetic protons in a double layer formed by the laser irradiation of an ultra-thin film. The ponderomotive force of the laser light pushes the electrons forward, and the induced space charge electric field pulls the ions and makes the thin foil accelerate as a whole. The ions trapped by the combined electric field and inertial force in the accelerated frame, together with the electrons trapped in the well of the ponderomotive and ion electric field, form a stable double layer. The trapped ions are accelerated to monoenergetic energies up to 100 MeV and beyond, making them suitable for cancer treatment. We present an analytic theory for the laser-accelerated ion energy and for the amount of trapped ions as functions of the laser intensity, foil thickness and the plasma number density. We also discuss the underlying physics of the trapped and untrapped ions in a double layer. The analytical results are compared with those obtained from direct Vlasov simulations of the fully nonlinear electron and ion dynamics that is controlled by the laser light.
Original languageEnglish
Article number073006
Number of pages19
JournalNew Journal of Physics
Volume11
Issue number7
DOIs
Publication statusPublished - 3 Jul 2009

Fingerprint

foils
emerging
protons
lasers
ions
electric fields
ponderomotive forces
electrons
inertia
space charge
cancer
physics
irradiation
energy
thin films
simulation

Keywords

  • plasma interactions
  • electron-beams
  • wakefield accelerator
  • fusion ignition
  • ion-beams
  • driven
  • pulses
  • generation
  • radiation
  • therapy

Cite this

Eliasson, Bengt ; Liu, Chuan S. ; Shao, Xi ; Sagdeev, Roald Z. ; Shukla, Padma K. / Laser acceleration of monoenergetic protons via a double layer emerging from an ultra-thin foil. In: New Journal of Physics. 2009 ; Vol. 11, No. 7.
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abstract = "We present theoretical and numerical studies of the acceleration of monoenergetic protons in a double layer formed by the laser irradiation of an ultra-thin film. The ponderomotive force of the laser light pushes the electrons forward, and the induced space charge electric field pulls the ions and makes the thin foil accelerate as a whole. The ions trapped by the combined electric field and inertial force in the accelerated frame, together with the electrons trapped in the well of the ponderomotive and ion electric field, form a stable double layer. The trapped ions are accelerated to monoenergetic energies up to 100 MeV and beyond, making them suitable for cancer treatment. We present an analytic theory for the laser-accelerated ion energy and for the amount of trapped ions as functions of the laser intensity, foil thickness and the plasma number density. We also discuss the underlying physics of the trapped and untrapped ions in a double layer. The analytical results are compared with those obtained from direct Vlasov simulations of the fully nonlinear electron and ion dynamics that is controlled by the laser light.",
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Laser acceleration of monoenergetic protons via a double layer emerging from an ultra-thin foil. / Eliasson, Bengt; Liu, Chuan S.; Shao, Xi; Sagdeev, Roald Z.; Shukla, Padma K.

In: New Journal of Physics, Vol. 11, No. 7, 073006, 03.07.2009.

Research output: Contribution to journalArticle

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T1 - Laser acceleration of monoenergetic protons via a double layer emerging from an ultra-thin foil

AU - Eliasson, Bengt

AU - Liu, Chuan S.

AU - Shao, Xi

AU - Sagdeev, Roald Z.

AU - Shukla, Padma K.

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KW - driven

KW - pulses

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KW - radiation

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