Abstract
Generation of fast and slow upper hybrid waves by two plasmon decay of non-resonant beating mode of two counter-propagating X-mode lasers is modelled in magnetized plasma. Two counter-propagating lasers having frequencies and wave-vectors (ω1,k1) and (ω2,k2), respectively, generate a non resonant beat wave at frequency difference ω0≈ω1∼ω2 and wave number k→0≈k→1+k→2 which parametrically excites a pair of copropagating fast and slow upper hybrid waves at ω0≈2ωh+(3k12vth2/ωh) (1−ωh/ω1) where ωh and vth are the upper hybrid frequency and electron thermal speed, respectively. The fast upper hybrid wave can be utilized for electron acceleration because its phase velocity is close to c. The growth rate of decay process is Γ∼ωp/10 at scattering angle θs∼5π/6 and magnetic field ∼90 T, which is one order higher as compared to the growth rate of Raman process. The growth rate can be further enhanced (∼20%) by increasing the magnetic field ∼450 T.
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