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This allows the implementation of almost every cathode material.
This obviates the need to model the complicated phenomena at the cathode surface itself.
The principles described are quite general and may be applied to other cathode-ray tube and camera tube designs.
This method is useful for applications, such as field-emission lamps and x-ray tubes, which do not require nanofabricated cathode structures.
Moreover, experimental results indicate the possibility for further simplification of the cathode manufacture.
The experiments indicate that such cathodes ensures emission current densities averaged over the cathode surface of about 0.5 A/cm2 and can be used in high-voltage devices including microwave electronic instruments as well as portable X-ray sources.
If this success continues as more properties of the cathode are investigated, it may never be necessary to perform the long sought for experiment to prove which theory is correct.
The unique combination of efficient cathode emission and hot injection possible in these devices suggests that a solid state analogue of the cathode ray tube may be realizable.
Emission images of the cathode surface prove that the plasma layer forms on the cathode surface, and the production mechanism of the high-current electron beams is explosive electron emission.
Proceedings ArticleDOI
Zhifei Wen, Rebecca Fahrig, Norbert J. Pelc 
05 Jun 2003
11 Citations
We conclude that fixed anode x-ray tubes can be used in a magnetic field although its desired electron optics must be fairly “straight” and the cathode-anode axis must be well aligned with the field.