Studying the Field Emission Cathode-Gate Structure Based on Carbon Nanotubes for Electron-Optical Systems with a Sheet Beam

摘要

Results of studying the cathode-gate structure based on carbon nanotubes (CNTs) are presented. Experimental samples of a matrix field emission cathode-gate structure based on a vertical array of CNTs with a cell diameter of 1 mu m and microstructure period of 5 mu m have been manufactured. Based on experimental data, an electron-optical system with a ribbon-type field emission CNT based cathode with a linear convergence of 6.25 and beam-current density of 4.46 A/cm(2) has been proposed. Results of modeling a sheet 0.16-mm-thick electron beam formed by an electron gun with a CNT cathode demonstrated the possibility to obtain a low-perveance flow with a small deformation in the 0.3 x 0.8-mm beam tunnel of a slow wave 25-mm-long structure.