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Upper hybrid turbulence and resonant absorption of high-power laser light by underdense plasma

Effects of the self-generated magnetic field in a plasma irradiated with a high-power laser beam are discussed, mainly in the context of fast-ignition fusion. In addition to the well-known collimation and filamentation of the laser light, a reduction in nonlinear absorption through the decay instability in the electron acceleration (i) and possible turbulence (ii) may affect the ignition efficiency. In contrast to the collimation, both latter effects influence the efficiency adversely.