Energy transfer in a collisionless plasma

Energy transfer of the decay of electron temperature break in a collisionless plasma was investigated by the numerical simulation method to study energy transfer processes in a laser plasma, electron heat conduction in particular. Spatial, time and temperature dependences were considered for energy flux. Energy flux transferred out from a region with heated electrons to the neighbouring region with cold electrons is shown not to achieve free-molecular boundary at the absence of external energy sources in a collisionless plasma. The flux is maximum at the point of initial temperature break, it is proportional to the temperature of hot electrons in the degree 3/2, and it is about twofold smaller than the flux into vacuum. There is a substantial dependence of the flux on the coordinate which is symmetrical in relation to the point of initial temperature break, time dependence being weaker. The backcurrent of cold electrons to the region previously occupied by hot electrons is observed at the numerical experiment along with a characteristic reduction and subsequent increase near the point of X=0 of electron density undergoing fluctuations. The ions are shown to be carried away by electrons