Assertion: electron's field | /r/CreatedBy | the anode
Facets:
Source sentences:
text: With tungsten cathodes, emission current densities about 100 mA/mm2 can be achieved, but only a small portion of the emitted electrons takes part in beam formation, depending on the electric field produced by the anode and control electrode voltages.
text: They are then accelerated and formed into a narrow convergent beam by an electric field produced by three electrodes: the electron emitting strap, the cathode connected to the negative pole of the high (accelerating) voltage power supply (30 - 200 kV) and the positive high voltage electrode, the anode.