Quadrupole magnet

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Notion

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Science and technology

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What Wikipedia says

Quadrupole magnets consist of a group of four magnets laid out so that in the planar multipole expansion of the field, the dipole terms cancel and where the lowest significant terms in the field equations are quadrupole.

Excerpt from the Wikipedia article “Quadrupole magnet”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: K. Aainsqatsi at English Wikipedia, Public domain, via Wikimedia Commons.