Influence of laser irradiated spot size on energetic electron injection and proton acceleration in foil targets

Paul McKenna, David Carroll, Mireille Coury, A.P.L. Robinson, Xiaohui Yuan, Ceri Mae Brenner, Matthias Burza, Ross Gray, Mark Quinn, David Neely, Olivier Tresca, Kate Lancaster, YT Li, XX Lin, CG Wahlstrom

Research output: Contribution to journalLetter

12 Citations (Scopus)

Abstract

The influence of irradiated spot size on laser energy coupling to electrons, and subsequently to protons, in the interaction of intense laser pulses with foil targets is investigated experimentally. Proton acceleration is characterized for laser intensities ranging from 2 x 10(18) - 6 x 10(20) W/cm(2), by (1) variation of the laser energy for a fixed irradiated spot size, and (2) by variation of the spot size for a fixed energy. At a given laser pulse intensity, the maximum proton energy is higher under defocus illumination compared to tight focus and the results are explained in terms of geometrical changes to the hot electron injection
LanguageEnglish
Article number074105
JournalApplied Physics Letters
Volume100
Issue number7
DOIs
Publication statusPublished - 13 Feb 2012

Fingerprint

foils
injection
protons
lasers
electrons
proton energy
pulses
hot electrons
energy
illumination
interactions

Keywords

  • electron injection
  • proton acceleration
  • lasers
  • laser irradiation

Cite this

McKenna, P., Carroll, D., Coury, M., Robinson, A. P. L., Yuan, X., Brenner, C. M., ... Wahlstrom, CG. (2012). Influence of laser irradiated spot size on energetic electron injection and proton acceleration in foil targets. Applied Physics Letters, 100(7), [074105]. https://doi.org/10.1063/1.3685615
McKenna, Paul ; Carroll, David ; Coury, Mireille ; Robinson, A.P.L. ; Yuan, Xiaohui ; Brenner, Ceri Mae ; Burza, Matthias ; Gray, Ross ; Quinn, Mark ; Neely, David ; Tresca, Olivier ; Lancaster, Kate ; Li, YT ; Lin, XX ; Wahlstrom, CG. / Influence of laser irradiated spot size on energetic electron injection and proton acceleration in foil targets. In: Applied Physics Letters. 2012 ; Vol. 100, No. 7.
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abstract = "The influence of irradiated spot size on laser energy coupling to electrons, and subsequently to protons, in the interaction of intense laser pulses with foil targets is investigated experimentally. Proton acceleration is characterized for laser intensities ranging from 2 x 10(18) - 6 x 10(20) W/cm(2), by (1) variation of the laser energy for a fixed irradiated spot size, and (2) by variation of the spot size for a fixed energy. At a given laser pulse intensity, the maximum proton energy is higher under defocus illumination compared to tight focus and the results are explained in terms of geometrical changes to the hot electron injection",
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McKenna, P, Carroll, D, Coury, M, Robinson, APL, Yuan, X, Brenner, CM, Burza, M, Gray, R, Quinn, M, Neely, D, Tresca, O, Lancaster, K, Li, YT, Lin, XX & Wahlstrom, CG 2012, 'Influence of laser irradiated spot size on energetic electron injection and proton acceleration in foil targets' Applied Physics Letters, vol. 100, no. 7, 074105. https://doi.org/10.1063/1.3685615

Influence of laser irradiated spot size on energetic electron injection and proton acceleration in foil targets. / McKenna, Paul; Carroll, David; Coury, Mireille; Robinson, A.P.L.; Yuan, Xiaohui; Brenner, Ceri Mae; Burza, Matthias; Gray, Ross; Quinn, Mark; Neely, David; Tresca, Olivier; Lancaster, Kate; Li, YT; Lin, XX; Wahlstrom, CG.

In: Applied Physics Letters, Vol. 100, No. 7, 074105, 13.02.2012.

Research output: Contribution to journalLetter

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T1 - Influence of laser irradiated spot size on energetic electron injection and proton acceleration in foil targets

AU - McKenna, Paul

AU - Carroll, David

AU - Coury, Mireille

AU - Robinson, A.P.L.

AU - Yuan, Xiaohui

AU - Brenner, Ceri Mae

AU - Burza, Matthias

AU - Gray, Ross

AU - Quinn, Mark

AU - Neely, David

AU - Tresca, Olivier

AU - Lancaster, Kate

AU - Li, YT

AU - Lin, XX

AU - Wahlstrom, CG

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AB - The influence of irradiated spot size on laser energy coupling to electrons, and subsequently to protons, in the interaction of intense laser pulses with foil targets is investigated experimentally. Proton acceleration is characterized for laser intensities ranging from 2 x 10(18) - 6 x 10(20) W/cm(2), by (1) variation of the laser energy for a fixed irradiated spot size, and (2) by variation of the spot size for a fixed energy. At a given laser pulse intensity, the maximum proton energy is higher under defocus illumination compared to tight focus and the results are explained in terms of geometrical changes to the hot electron injection

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