focusing coil

focusing coil

[′fō·kəs·iŋ ‚kȯil]
(electronics)
A coil that produces a magnetic field parallel to an electron beam for the purpose of focusing the beam.
References in periodicals archive ?
The proton detector, a CsI scintillator, is situated on top of the storage volume; the decay protons are accelerated and focused onto it through a potential difference in the storage volume and an additional focusing coil around the detector.