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After the successful fusion ignition at National Ignition Facility, seekingfor a high-gain fusion scheme becomes the next hot-spot in inertial confinementfusion community. Fast ignition provides an alternative due to its potential toreduce the energy of driven lasers and achieve higher target gain, whose corestep is generating fast electron beam using picosecond lasers. The propertiesof the electron beam, such as energy spectra, determines the succeed heatingprocess and the yield. In this study, with 2D particle-in-cell simulations, wefind that the energy transfer ratio would significantly increase, and theenergy spectra would be lifted up in the dual-color injecting scheme, where anextra weak low-frequency laser is injected with the main pulse. These phenomenaare attributed to the longitudinal electric field modulation in low-densityregion and electromagnetically-induced-transparency process in themicrochannels formed near the critical surface. Our results can be applied tofast ignition schemes and experimental designs of super-hot electron generationwith different pulse durations. For example, in the DCI project with a fastignition scheme, such a dual-color intense picosecond laser facility is underconstruction to control the fast electron generation and enhance the lasertransparency.

Control of energy spectra and enhancement of energy conversion of fast electrons generated by dual-color picosecond lasers