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Enhanced fast-electron generation by optimizing the crossing point of two picosecond laser pulses with large angles
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- Journal:
- High Power Laser Science and Engineering / Volume 14 / 2026
- Published online by Cambridge University Press:
- 07 July 2026, e82
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- Article
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The under-construction high-energy laser facility SG-X for the double-cone ignition scheme will deliver multiple picosecond laser beams with the crossing angle up to $60{}^{\circ}$
. Here, we investigate the generation and transport of fast electrons driven by two relativistic picosecond laser pulses with an angle by particle-in-cell simulations. When the angle reaches $60{}^{\circ}$
, the fast-electron generation decreases compared to that with an optimized angle around $20{}^{\circ}$
. The decrease is associated with weaker and less stable interference-induced surface structures. The fast-electron generation can be significantly enhanced by shifting the crossing point of the pulses from the vacuum–plasma boundary into the plasma interior. The optimal crossing point is near the laser hole boring depth. We also find that an externally applied magnetic field can effectively guide fast-electron transport in this optimized geometry. The guiding saturates around a strength of $0.5\;\mathrm{kT}$
under the present simulation parameters, which is achievable in previous experiments.
