Fig. 4From: Wide-range Vacuum Measurements from MWNT Field Emitters Grown Directly on Stainless Steel SubstratesEmission characteristics of the electron source with the MWNT emission area of 20 mm2 and the cathode-gate spacing of 100 μm. a I-V curves under cathode-anode spacing of 2 mm and anode voltage of 430 V. b Electron transmittances over the gate grid with the increase of V a/V g ratiosBack to article page