Electromagnetic modelling package speeds design of active electron optic X-ray tubes

The 3D version of Vector Fields' electromagnetic modelling algorithm for charged particle beams is playing a key role in the development cycle of Philips Medical Systems' first commercial X-ray imaging systems with 'active optics'.

Active beam technology supports dynamic focusing and positioning of the electron beam during investigation procedures, greatly improving the resolution and quality of imaging in CT and cardiovascular scanning equipment.

Vector Fields' solver for charged particle beams has helped Philips to overcome the design challenge of actively focusing an X-ray tube, which is subject to complex space-charge effects. Space charge impacts emission efficiency and distorts beam trajectory, and its effects are exacerbated as emission current increases - which itself is highly desirable in X-ray equipment for both speed of operation and the ability to image denser material.

The company's Opera electromagnetic modelling suite is being used to help design the emitting elements and an 'electromagnetic lens' beam focusing system. The software has been useful in understanding focusing at higher beam current levels. The software allows users to model performance using a combination of emission effects including the Langmuir-Fry current limits.