Study on Grid structure Effect for Field Enhancement Factor in Triode type CNT X-ray source

W.S. Chang, S.K. Seol, D. Kim, B.S. Kim, W.M. Bae, K.C. Park, S. Jung
Korea Electrotechnology Research Institute, KR

Keywords: CNT, field enhancemen factor, triode, X-ray source

Summary:

we demonstrate that the grid structure significantly affects the FEF of the planar type CNT emitter in triode structure. In our experiment, field emission characteristics are measured by adjusting the grid-CNT emitter gap distances and grid mesh size. The results clearly show that the variation of grid structure - a decrease of the grid mesh size and an increase of the gap distance - induces modification of local electric field on individual CNT, resulting in an effective increase of the FEF.