A sextupole magnet is a type of electromagnet or permanent magnet that produces a magnetic field with a sextupole configuration. In terms of multipole fields, a sextupole refers to the term in the multipole expansion that has a magnetic field that varies with the third power of the distance from the center, typically noted as \(B\) (magnetic field strength) depending on the radial position \(r\) as \(B \propto r^3\).
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