Study of hot electron beam transport in high density plasma using 3D hybrid-Darwin code Original Research Article

Hot electron transport has been analyzed by our newly developed hybrid-Darwin code, which is aimed to apply the detail analysis of the fast ignition scheme. Our code divides electrons into two species, fast beam electrons and cold background electrons and fast electrons are described as particles, while background electrons and ions are described as fluids. The results show that the beam electron injected into a high density plasma forms a ring structure followed by the breakup into filaments because of the two stream instability. Our recently developed open boundary code shows such a ring formation and the impedance of the straight flow by the concentration of the hot electron beam due to the strong self-generated magnetic filed. The self-pinch and the following divergence of the electron beam after a relatively short propagation are crucial for the achievement of the fast ignition scheme.