Trajectories of high energy electrons in a plasma focus

The intensity of X-rays from a plasma focus was measured as a function of position, time, energy, and angle of emission. The low energy X-rays emanated from the plasma, but the high energy components came from a small region of the anode surface, on axis. Emission from the focus occurred some 20 ns prior to that from the anode, but the latter continued for 500 ns. X-ray 'shadow' techniques showed that the high energy electrons traveled in a beam almost perpendicular to the anode surface. Spatial plots of X-ray intensity at different energies showed that the electrons gained energy as they approached the anode. No counter-streaming of high energy electrons away from the anode was evident.