Effect of self-generated magnetic fields on fast-electron beam divergence in solid targets

X. H. Yuan, A. P. L. Robinson, M. N. Quinn, D. C. Carroll, M. Borghesi, R. J. Clarke, R. G. Evans, J. Fuchs, P. Gallegos, L. Lancia, D. Neely, K. Quinn, L. Romagnani, G. Sarri, P. A. Wilson, P. McKenna

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The collimating effect of self-generated magnetic fields on fast-electron transport in solid aluminium targets irradiated by ultra-intense, picosecond laser pulses is investigated in this study. As the target thickness is varied in the range of 25 mu m to 1.4 mm, the maximum energies of protons accelerated from the rear surface are measured to infer changes in the fast-electron density and therefore the divergence of the fast-electron beam transported through the target. Purely ballistic spreading of the fast-electrons would result in a much faster decrease in the maximum proton energy with increasing target thickness than that measured. This implies that some degree of 'global' magnetic pinching of the fast-electrons occurs, particularly for thick (>400 mu m) targets. Numerical simulations of electron transport are in good agreement with the experimental data and show that the pinching effect of the magnetic field in thin targets is significantly reduced due to disruption of the field growth by refluxing fast-electrons.

LanguageEnglish
Article number063018
Number of pages10
JournalNew Journal of Physics
Volume12
DOIs
Publication statusPublished - 11 Jun 2010

Fingerprint

divergence
electron beams
target thickness
magnetic fields
electrons
proton energy
ballistics
aluminum
protons
pulses
lasers
simulation
energy

Keywords

  • proton acceleration
  • driven
  • transport
  • ignition
  • pulse
  • rear

Cite this

Yuan, X. H., Robinson, A. P. L., Quinn, M. N., Carroll, D. C., Borghesi, M., Clarke, R. J., ... McKenna, P. (2010). Effect of self-generated magnetic fields on fast-electron beam divergence in solid targets. New Journal of Physics, 12, [063018]. https://doi.org/10.1088/1367-2630/12/6/063018
Yuan, X. H. ; Robinson, A. P. L. ; Quinn, M. N. ; Carroll, D. C. ; Borghesi, M. ; Clarke, R. J. ; Evans, R. G. ; Fuchs, J. ; Gallegos, P. ; Lancia, L. ; Neely, D. ; Quinn, K. ; Romagnani, L. ; Sarri, G. ; Wilson, P. A. ; McKenna, P. / Effect of self-generated magnetic fields on fast-electron beam divergence in solid targets. In: New Journal of Physics. 2010 ; Vol. 12.
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Yuan, XH, Robinson, APL, Quinn, MN, Carroll, DC, Borghesi, M, Clarke, RJ, Evans, RG, Fuchs, J, Gallegos, P, Lancia, L, Neely, D, Quinn, K, Romagnani, L, Sarri, G, Wilson, PA & McKenna, P 2010, 'Effect of self-generated magnetic fields on fast-electron beam divergence in solid targets' New Journal of Physics, vol. 12, 063018. https://doi.org/10.1088/1367-2630/12/6/063018

Effect of self-generated magnetic fields on fast-electron beam divergence in solid targets. / Yuan, X. H.; Robinson, A. P. L.; Quinn, M. N.; Carroll, D. C.; Borghesi, M.; Clarke, R. J.; Evans, R. G.; Fuchs, J.; Gallegos, P.; Lancia, L.; Neely, D.; Quinn, K.; Romagnani, L.; Sarri, G.; Wilson, P. A.; McKenna, P.

In: New Journal of Physics, Vol. 12, 063018, 11.06.2010.

Research output: Contribution to journalArticle

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T1 - Effect of self-generated magnetic fields on fast-electron beam divergence in solid targets

AU - Yuan, X. H.

AU - Robinson, A. P. L.

AU - Quinn, M. N.

AU - Carroll, D. C.

AU - Borghesi, M.

AU - Clarke, R. J.

AU - Evans, R. G.

AU - Fuchs, J.

AU - Gallegos, P.

AU - Lancia, L.

AU - Neely, D.

AU - Quinn, K.

AU - Romagnani, L.

AU - Sarri, G.

AU - Wilson, P. A.

AU - McKenna, P.

PY - 2010/6/11

Y1 - 2010/6/11

N2 - The collimating effect of self-generated magnetic fields on fast-electron transport in solid aluminium targets irradiated by ultra-intense, picosecond laser pulses is investigated in this study. As the target thickness is varied in the range of 25 mu m to 1.4 mm, the maximum energies of protons accelerated from the rear surface are measured to infer changes in the fast-electron density and therefore the divergence of the fast-electron beam transported through the target. Purely ballistic spreading of the fast-electrons would result in a much faster decrease in the maximum proton energy with increasing target thickness than that measured. This implies that some degree of 'global' magnetic pinching of the fast-electrons occurs, particularly for thick (>400 mu m) targets. Numerical simulations of electron transport are in good agreement with the experimental data and show that the pinching effect of the magnetic field in thin targets is significantly reduced due to disruption of the field growth by refluxing fast-electrons.

AB - The collimating effect of self-generated magnetic fields on fast-electron transport in solid aluminium targets irradiated by ultra-intense, picosecond laser pulses is investigated in this study. As the target thickness is varied in the range of 25 mu m to 1.4 mm, the maximum energies of protons accelerated from the rear surface are measured to infer changes in the fast-electron density and therefore the divergence of the fast-electron beam transported through the target. Purely ballistic spreading of the fast-electrons would result in a much faster decrease in the maximum proton energy with increasing target thickness than that measured. This implies that some degree of 'global' magnetic pinching of the fast-electrons occurs, particularly for thick (>400 mu m) targets. Numerical simulations of electron transport are in good agreement with the experimental data and show that the pinching effect of the magnetic field in thin targets is significantly reduced due to disruption of the field growth by refluxing fast-electrons.

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