Journal
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
Volume 18, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevSTAB.18.023402
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Funding
- Physics Sciences Research Council Grants [EP/G054940/1, EP/G055165/1, EP/G056803/1]
- [JARA-HPC/JZAM04]
- Engineering and Physical Sciences Research Council [EP/G054940/1, EP/G056803/1] Funding Source: researchfish
- EPSRC [EP/G054940/1, EP/G055165/1, EP/G056803/1] Funding Source: UKRI
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Attosecond electron bunches produced at the surface of nanometer- scale droplets illuminated by a two-cycle laser pulse are investigated for the purpose of determining their optimal emission characteristics. Significant departures from Mie theory are found for electron bunch emission from droplets whose radii satisfy the condition delta(r) < R < 10 delta(r), where delta(r) = gamma(1/2)c/omega(p) is the plasma relativistic skin depth; an effect which can be accounted for by induced transparency. Scattering from such droplets is subject to a transitional regime which is neither accounted for by optical Mie theory valid for R >> delta, where delta is the usual plasma skin depth, norwith the Rayleigh regime (R < delta << lambda). Instead the angular emission of the bunches is to a good approximation described by the nonlinear ponderomotive scattering model. Subsequently, the bunches are subject to further deflection by the ponderomotive pressure of the copropagating laser field in vacuum, depending on the initial droplet parameters. Final emission angles are estimated, together with the energy spectrum of the bunches.
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