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Fast ignition is an alternative concept of laser fusion in which the task ofcompressing the fusion pellet to supersolid densities is accomplished by theconventional high energy nanosecond glass lasers and the task of igniting thecompressed pellet is given to a high intensity, moderate energy pico secondsource which can set the pellet ablaze (with DT fusion reactions) by creatingan adequate size hot spot in it. In this letter, we present a conceptual methodby which energy from carbon dioxide ($ CO_2 $) laser could be coupled to heatup ions produced in situ in the plasma, which in turn produces the required hotspot. An efficient conversion of $ CO_2 $ energy into ion beam energy can thusgive us the required source of energy for the fast ignition laser fusion. Wedemonstrate by using PIC (Particle - In - Cell) simulations that the use ofseveral Kilo Tesla of an external magnetic field in the transverse direction inan inhomogeneous plasma where a cutoff is followed by a resonance can lead tocoupling of laser energy to a lower hybrid ion plasma resonance. Then ions areaccelerated efficiently ($\sim 1 MeV$) by the breaking of lower hybrid wavesand thereby enabling the possibility of fast ignition by ions in a convenientfashion.

Fast Ignition Laser Fusion Using In-Situ Ion Acceleration With Pulsed CO2 Lasers