Particle-In-Cell Simulations of Electron Focusing for a Compact X-Ray Tube Comprising CNT-Based Electron Source and Transmission Type Anode

摘要: For real-time computed tomography (CT), a temporal resolution lower than 30 ms is required, which cannot be delivered by conventional CT architectures with rotation gantry. Stationary architecture can achieve eliminating the physical of gantry and electronically sweeping X-ray beams across utilizes two separate arrays, one for distributed sources another detectors. These individual are required to compact, fast, individually addressable in order acquire 200+ projections successful reconstruction ms. A compact tube that fits these requirements being developed. The aim this paper was design an electrostatic electron focusing lens first-generation prototype primarily consisting carbon nanotube-based source transmission-type anode studying multiple variables affect focal spot size (FSS) comparing different types lenses help simulations. This multivariable simulation study conducted using object-oriented particle-in-cell code, OOPIC PRO. results simulations showed following: Einzel FSS (lower 1 mm); aperture, thickness, location used as coarse control over FSS, whereas potential fine control; chromatic spherical aberrations reduced if used.