Authors: S. Jung, D. Kim, S.K. Seol
Affilation: Korea Electrotechnology Research Institute, Korea
Pages: 185 - 187
Keywords: field emission, X-ray source, electron beam
A field-emission X-ray source for dental imaging with an anode voltage of 70 kV and an anode current of more than 1 mA was designed and assembled using an anisotropically focused electron beam. With up to 3 kV (5 V/um) applied to a grid, the emitted electrons from a carbon nanotube based cathode were shaped into an elliptical beam by an anisotropic electron lens. The electron beam was accelerated by an 13.5-degree angled stationary anode target and focused to a small spot size, which results in an circular-shaped effective X-ray focal spot with a diameter of less than 400 um. Acknowledgment This study was supported by the research fund from Seoul R&BD program (grant # CR070054).