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A novel scheme for the creation of a convergent, or focussing, fast-electronbeam generated from ultra-high-intensity laser-solid interactions is described.Self-consistent particle-in-cell simulations are used to demonstrate theefficacy of this scheme in two dimensions. It is shown that a beam offast-electrons of energy 500 keV - 3 MeV propagates within a solid-densityplasma, focussing at depth. The depth of focus of the fast-electron beam iscontrolled via the target dimensions and focussing optics.

A focusable, convergent fast-electron beam from ultra-high-intensity laser-solid interactions