quadrupole

noun

(physics) A distribution of either electric charge or magnetization equivalent to two dipoles that point in opposite directions.

The quadrupole is used in particle accelerators to focus and steer particle beams.

意味（1）

(physics) A distribution of either electric charge or magnetization equivalent to two dipoles that point in opposite directions.

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).

意味（2）

(physics) A magnet with two north poles and two south poles, used to focus a beam of particles.