BROWSE
Detail
Conference Paper
Modeling and Simulation of Electron Beam Trajectories from Carbon Nanotube Field Emitters in X-ray Tubes
Cited - time in 
Share 
Share
- Authors
- Yujung Ahn, Hyojin Jeon, Eunsol Go, Jeong-Woong Lee, Yoon-Ho Song, Sora Park, Jin-Woo Jeong, Jae-Woo Kim, Jun-Tae Kang, Ki Nam Yun, Ji-Hwan Yeon, Sunghee Kim
- Issue Date
- 2019-07
- Citation
- International Vacuum Nanoelectronics Conference (IVNC) 2019, pp.1-2
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- The focal spot size (FSS) is one of the main specifications of an x-ray tube in terms of its spatial resolution. In accurately predicting and estimating the FSS, it is very important to trace electron-beams (e-beams) from the cathode to anode. In the case of the x-ray tube with carbon nanotube (CNT) field emitters, modeling and simulation of individual CNT emitters based on 3-dimensional finite element method (3D FEM) is very difficult because of the complexity of CNT shape along with mesh scales from subnanometer to several tens millimeter. To allow proper computation of e-beam trajectories, we newly modeled CNT field emitter cathode with a medium representing the macro- and micro structural effect through its initial velocity parameters of emitted electrons. The calculated e-beam trajectories from the proposed medium model have been compared with the experimental ones that were evaluated using a triode configuration with a fluorescent anode. As a result, the proposed medium model of CNT emitters could successfully predict their e-beam trajectories relatively well matched with the experimental tendencies.
- KSP Keywords
- 3-dimensional finite element method(3-D FEM), CNT field emitter, Carbon nano-tube(CNT), E-beam, Electron beam, Finite Element(FE), Finite-element method(FEM), Focal spot, Micro structural, Modeling and Simulation, Spot size