different between quadrupole vs sextupole

English

quadrupole (plural quadrupoles)

(physics) A distribution of either electric charge or magnetization equivalent to two dipoles that point in opposite directions.
- 1975, David M. Cook, The Theory of the Electromagnetic Field, page 123,
  Consider a linear quadrupole consisting of a point charge of strength 2q at the origin and point charges of strength —q at (0, 0, a) and (0, 0, —a).
(physics) A magnet with two north poles and two south poles, used to focus a beam of particles.

sextupole (plural sextupoles)

(physics) a distribution of either electric charge or magnetization equivalent to three dipoles that point in different directions
(physics) a magnet with three north poles and three south poles, used to focus or contain a beam of particles

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