Here, we investigate, through parametrically optimized macroscale simulations, the field\nelectron emission from arrays of carbon nanotube (CNT)-coated Spindts towards the development\nof an emerging class of novel vacuum electron devices. The present study builds on empirical data\ngleaned from our recent experimental findings on the room temperature electron emission from large\narea CNT electron sources. We determine the field emission current of the present microstructures\ndirectly using particle in cell (PIC) software and present a new CNT cold cathode array variant which\nhas been geometrically optimized to provide maximal emission current density, with current densities\nof up to 11.5 A/cm2 at low operational electric fields of 5.0 V/�¼m.
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