Nanotech 2011

A field-emission X-ray source using an anisotropically focused electron beam

S. Jung, W.K. Han, D. Kim, W.S. Chang, S.K. Seol, W.M. Bae, G.S. Byun, K.C. Park and B.K. Ju
Korea Electrotechnology Research Institute, KR

Keywords: field emission, X-ray source, electron beam


Abstract 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).

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