X-RAY SYSTEM WITH FIELD EMITTERS AND ARC PROTECTION

An x-ray tube, comprising: a field emitter including an emission surface; an anode; and a focus electrode disposed between the field emitter and the anode; wherein: the focus electrode includes: a first surface that is substantially perpendicular to the field emitter emission surface and nearest to the field emitter; a second surface that is axially nearest to the anode, wherein the field emitter and the anode form an axis; and a third surface that extends between the first surface and the second surface; and a first location on the focus electrode between the first surface and the third surface is further from the anode than a second location on the focus electrode between the third surface and the second surface. 100c lO~c~hK102 Anode z 304 3063-6 106c 30210 Electrode 106 308 308 Field 31 1(n 04 Emitter Anode 416 4414- Field Emitter z