electromagnetic focusing

electromagnetic focusing

[i¦lek·trō·mag′ned·ik ′fō·kəs·iŋ]
(electronics)
Focusing the electron beam in a telelvision picture tube by means of a magnetic field parallel to the beam; the field is produced by sending an adjustable value of direct current through a focusing coil mounted on the neck of the tube.
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Electromagnetic focusing and alignment coils, located below the anode, provide the beam focus and alignment capability needed to ensure that the high velocity stream of electrons being produced passes cleanly through the series of in-line orifices it encounters in traversing the succession of progressively increasing pressure stages.

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