1. Kαfluorescence measurement of relativistic electron transport in the context of fast ignition
- Author
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Dimitri Batani, M. H. Key, R. R. Freeman, Kate Lancaster, J. A. Koch, C. Rousseaux, Peter Norreys, C. Andersen, Richard B. Stephens, M. Rabec Le Gloahec, J A King, Yefim Aglitskiy, François Amiranoff, J. M. Hill, S. P. Hatchett, Sophie Baton, E. Martinolli, E. Perelli-Cippo, A. J. Mackinnon, R. A. Snavely, M. Koenig, F. Scianitti, Todd H. Hall, Thomas E. Cowan, and Joao Santos
- Subjects
Physics ,Full width at half maximum ,Electron injection ,Monte Carlo method ,Atomic physics ,Electron transport chain ,Fluorescence - Abstract
Electron transport within solid targets, irradiated by a high-intensity short-pulse laser, has been measured by imaging ${K}_{\ensuremath{\alpha}}$ radiation from high-$Z$ layers (Cu, Ti) buried in low-$Z$ (CH, Al) foils. Although the laser spot is $\ensuremath{\sim}10\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ [full width at half maximum (FWHM)], the electron beam spreads to $\ensuremath{\geqslant}70\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ FWHM within $l20\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ of penetration into an Al target then, at depths $g100\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$, diverges with a $40\ifmmode^\circ\else\textdegree\fi{}$ spreading angle. Monte Carlo and analytic models are compared to our data. We find that a Monte Carlo model with a heuristic model for the electron injection gives a reasonable fit with our data.
- Published
- 2004