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Time-Resolved Plasma Expansion Measurements in a Formed Ferrite Plasma Cathode X-Ray Diode

Time-resolved measurements of plasma expansion in a plasma cathode X-ray and electron-beam generator using a formed ferrite plasma source have been made by means of streak-camera photography. The obtained streak images were analyzed in detail by a high-resolution image processing system (spatial resolution: 67 µ m/ pixel, time resolution: 6.5 ns/pixel) to derive the time-dependent expansion velocities. Time-averaged expansion velocities over periods (0.4-1.2 µ s) for plasma growth were 1-1.5 cm/µ s and ∼0.5 cm/µ s for the cathode plasma and for the secondary plasma from the anode, respectively. Measurements also show the influence of the cathode driving voltage and the acceleration field intensity upon the plasma expansion.