An arrangement of two conducting sheets forming a capactor and giving a radial electrostatic
field which is used to deflect and focus ion beams of different energies. The capacitor
may, for example, be cylindrical, spherical or toroidal.
Source:
PAC, 1991, 63, 1541
(Recommendations for nomenclature and symbolism for mass spectroscopy (including an
appendix of terms used in vacuum technology). (Recommendations 1991))
on page 1544