Intra-pulse transition between ion acceleration mechanisms in intense laser-foil interactions

H. Padda, M. King, R. J. Gray, H. W. Powell, Bruno Izquierdo, L. C. Stockhausen, R. Wilson, D. C. Carroll, R. J. Dance, D. A. MacLellan, X. H. Yuan, N. M. H. Butler, R. Capdessus, M. Borghesi, D. Neely, P. McKenna

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Multiple ion acceleration mechanisms can occur when an ultrathin foil is irradiated with an intense laser pulse, with the dominant mechanism changing over the course of the interaction. Measurement of the spatial-intensity distribution of the beam of energetic protons is used to investigate the transition from radiation pressure acceleration to transparency-driven processes. It is shown numerically that radiation pressure drives an increased expansion of the target ions within the spatial extent of the laser focal spot, which induces a radial deflection of relatively low energy sheath-accelerated protons to form an annular distribution. Through variation of the target foil thickness, the opening angle of the ring is shown to be correlated to the point in time transparency occurs during the interaction and is maximized when it occurs at the peak of the laser intensity profile. Corresponding experimental measurements of the ring size variation with target thickness exhibit the same trends and provide insight into the intra-pulse laser-plasma evolution.
LanguageEnglish
Article number063116
Number of pages6
JournalPhysics of Plasmas
Volume23
Issue number6
DOIs
Publication statusPublished - 27 Jun 2016

Fingerprint

foils
radiation pressure
pulses
lasers
target thickness
ions
protons
rings
interactions
laser plasmas
sheaths
deflection
trends
expansion
profiles
energy

Keywords

  • ion acceleration
  • ion acceleration mechanisms
  • foil
  • intense laser pulse

Cite this

Padda, H. ; King, M. ; Gray, R. J. ; Powell, H. W. ; Izquierdo, Bruno ; Stockhausen, L. C. ; Wilson, R. ; Carroll, D. C. ; Dance, R. J. ; MacLellan, D. A. ; Yuan, X. H. ; Butler, N. M. H. ; Capdessus, R. ; Borghesi, M. ; Neely, D. ; McKenna, P. / Intra-pulse transition between ion acceleration mechanisms in intense laser-foil interactions. In: Physics of Plasmas. 2016 ; Vol. 23, No. 6.
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abstract = "Multiple ion acceleration mechanisms can occur when an ultrathin foil is irradiated with an intense laser pulse, with the dominant mechanism changing over the course of the interaction. Measurement of the spatial-intensity distribution of the beam of energetic protons is used to investigate the transition from radiation pressure acceleration to transparency-driven processes. It is shown numerically that radiation pressure drives an increased expansion of the target ions within the spatial extent of the laser focal spot, which induces a radial deflection of relatively low energy sheath-accelerated protons to form an annular distribution. Through variation of the target foil thickness, the opening angle of the ring is shown to be correlated to the point in time transparency occurs during the interaction and is maximized when it occurs at the peak of the laser intensity profile. Corresponding experimental measurements of the ring size variation with target thickness exhibit the same trends and provide insight into the intra-pulse laser-plasma evolution.",
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Padda, H, King, M, Gray, RJ, Powell, HW, Izquierdo, B, Stockhausen, LC, Wilson, R, Carroll, DC, Dance, RJ, MacLellan, DA, Yuan, XH, Butler, NMH, Capdessus, R, Borghesi, M, Neely, D & McKenna, P 2016, 'Intra-pulse transition between ion acceleration mechanisms in intense laser-foil interactions' Physics of Plasmas, vol. 23, no. 6, 063116. https://doi.org/10.1063/1.4954654

Intra-pulse transition between ion acceleration mechanisms in intense laser-foil interactions. / Padda, H.; King, M.; Gray, R. J.; Powell, H. W.; Izquierdo, Bruno; Stockhausen, L. C.; Wilson, R.; Carroll, D. C.; Dance, R. J.; MacLellan, D. A.; Yuan, X. H.; Butler, N. M. H.; Capdessus, R.; Borghesi, M.; Neely, D.; McKenna, P.

In: Physics of Plasmas, Vol. 23, No. 6, 063116, 27.06.2016.

Research output: Contribution to journalArticle

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AU - Padda, H.

AU - King, M.

AU - Gray, R. J.

AU - Powell, H. W.

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AU - Stockhausen, L. C.

AU - Wilson, R.

AU - Carroll, D. C.

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AU - MacLellan, D. A.

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AU - Butler, N. M. H.

AU - Capdessus, R.

AU - Borghesi, M.

AU - Neely, D.

AU - McKenna, P.

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