Beam Imaging of a High-Brightness Elliptic Electron Gun

Zhou, Jing; Bemis, T.; Chen, Chiping; Lawrence, Michael H.; Gold, Steven H.; Nusinovich, Gregory S.

doi:10.1063/1.3520379

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Experimental Setup and Electron Gun Assembly1

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2014

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“…Zhou et al 30 used a 10-15 lm of P-43 phosphor (Gd 2 O 2 S:Tb) on an indium tin oxide (ITO) coated glass disk to test their elliptical electron gun. In order to prevent damage to the screen from overheating, the beam must be pulsed.…”

Section: Experimental Setup and Electron Gun Assemblymentioning

confidence: 99%

Design and characterization of electron beam focusing for X-ray generation in novel medical imaging architecture

et al. 2014

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A novel electron beam focusing scheme for medical X-ray sources is described in this paper. Most vacuum based medical X-ray sources today employ a tungsten filament operated in temperature limited regime, with electrostatic focusing tabs for limited range beam optics. This paper presents the electron beam optics designed for the first distributed X-ray source in the world for Computed Tomography (CT) applications. This distributed source includes 32 electron beamlets in a common vacuum chamber, with 32 circular dispenser cathodes operated in space charge limited regime, where the initial circular beam is transformed into an elliptical beam before being collected at the anode. The electron beam optics designed and validated here are at the heart of the first Inverse Geometry CT system, with potential benefits in terms of improved image quality and dramatic X-ray dose reduction for the patient. V C 2014 AIP Publishing LLC. [http://dx

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Section: Experimental Setup and Electron Gun Assemblymentioning

confidence: 99%