Single-slot tubular cathode

FIG. 1 is a first isometric view of a single-slot tubular cathode showing the new design;

FIG. 2 is a second isometric view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a second side view thereof;

FIG. 7 is a first end view thereof; and,

FIG. 8 is a second end view thereof.

The broken lines illustrate the environmental structure and form no part of the claimed design.