A monolithic structure includes an x y matrix of electron source cathodes and a pair of grid arrays successively spaced from {HEAD ~ the matrix} with {TAIL ~ holes} therethrough adjacent to and aligned with the cathodes selectively to form and individually control the intensity of an electron beam from each of said cathodes 
A monolithic structure includes an x y matrix of electron source cathodes and a pair of grid arrays successively spaced from { HEAD ~ the matrix } with { TAIL ~ holes } therethrough adjacent to and aligned with the cathodes selectively to form and individually control the intensity of an electron beam from each of said cathodes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH