Post-deflection acceleration
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Post-deflection acceleration was introduced in the early 1950s and was a major factor in the success of the 530/540 series of oscilloscopes.
It does exactly what its name implies: After the electron beam travels through both vertical and horizontal deflection plates, the beam is accelerated by an additional high voltage.
Initially, this was done with a single electrode. Later, multi-band acceleration was introduced that was finally superseded by the spiral accelerator.