Underdense plasma

Interaction of high-intensity laser pulse with supersonic gas-jets delivered by fast electromagnetic valves is the most common technique in LWF experiments worldwide. This kind of target allows a uniform, underdense plasma to be the interaction medium, with a density that can be tuned by managing... 

In this chapter we have reported on theoretical investigations of two different regimes of interaction between ultraintense EM radiation and plasmas, as examples of the application of the theoretical models developed in a previous chapter. First, we have studied the existence of localized spatial distributions of EM radiation, which appear in numerical simulations as a result of the injection of an ultrashort and intense laser pulse into an underdense plasma. Such solitonic structures originating from the equilibrium between the EM radiation pressure, the plasma pressure and the ambipolar field associated with the space charge have been described in the framework of both a relativistic kinetic model and a relativistic fluid approach. It has also been shown that... 

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