The anode is biased to a high positive voltage (typically +1 kV to +30 kV) relative to the emitter so as to accelerate electrons from the emitter towards the anode, thus creating an electron beam that passes through the Wehnelt aperture.
The anode is energized with a high positive voltage (typically +1 kV to +30 kV) relative to the emitter, which causes electrons emitted from the emitter to be accelerated toward the anode, forming an electron beam that exits through the Wehnelt aperture.