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Discharge kinetics and emission characteristics of a large-area-cold cathode flash X-ray tube: parametric study and numerical modelling.

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Steyer,  M.
Abteilung Laserphysik, MPI for biophysical chemistry, Max Planck Society;

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Citation

Steyer, M. (1990). Discharge kinetics and emission characteristics of a large-area-cold cathode flash X-ray tube: parametric study and numerical modelling. Journal of Physics D-Applied Physics, 23(1), 18-25. doi:10.1088/0022-3727/23/1/004.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-0E74-A
Abstract
A pulsed X-ray tube is described which consists of a large-area (80-400 cm2) cold carbon felt cathode and a tantalum foil anode arranged in transmission geometry. It is driven by a Marx generator with an output voltage between 60 and 140 kV. The dose and the dose rate of the X-ray flash together with the diode current are studied as a function of anode-cathode distance, the cathode area and the charging voltage. The tube characteristics are numerically well described by a simple model which considers cathode plasma migration and a space-charge limited current in the remaining vacuum gap.