0 the negative electrode in an electrolytic cell. -- cực âm
1 the positive terminal of a voltaic cell such as a battery. -- cực catot
However, these par ts are unnoticeable in the diagrams of erosion area distribution along the cathode length.
The zero electric field regulates injection of electrons abundantly available at the cathode surface, essentially controlling the diode current.
The wall curvature can be neglected because the cathode radius is much larger than the sheath thickness.
The main frequency of the virtual cathode is also deduced.
The frequency of the virtual cathode oscillation can be approximately given as half the reflected electron oscillation.
Here we do not care about the preliminary stage of the formation of the virtual cathode.
While the new electron subsequently starts to accelerate toward the anode, it leaves behind the ion which moves relatively slowly toward the cathode.
In the first mode, the plasma diffuse channel was growing, initiated by nonuniformity on the cathode.
