Quadrupole magnets abide of groups of four magnets laid out so that in the multipole amplification of the acreage the dipole agreement abolish and area the everyman cogent agreement in the acreage equations are quadrupole. Quadrupole magnets are advantageous as they actualize a alluring acreage whose consequence grows rapidly with the adorable ambit from its longitudinal axis. This is acclimated in atom axle focusing.
The simplest alluring quadrupole is two identical bar magnets alongside to anniversary added such that the arctic pole of one is next to the south of the added and carnality versa. Such a agreement would accept no dipole moment, and its acreage will abatement at ample distances faster than that of a dipole. A stronger adaptation with actual little alien acreage involves application a k=3 halbach cylinder.
In some designs of quadrupoles application electromagnets there are four animate pole tips: two opposing alluring arctic poles and two opposing alluring south poles. The animate is magnetized by a ample electric accepted that flows in the coils of tubing captivated about the poles. Another architecture is a Helmholtz braid blueprint but with the accepted in one of the coils reversed.1
The simplest alluring quadrupole is two identical bar magnets alongside to anniversary added such that the arctic pole of one is next to the south of the added and carnality versa. Such a agreement would accept no dipole moment, and its acreage will abatement at ample distances faster than that of a dipole. A stronger adaptation with actual little alien acreage involves application a k=3 halbach cylinder.
In some designs of quadrupoles application electromagnets there are four animate pole tips: two opposing alluring arctic poles and two opposing alluring south poles. The animate is magnetized by a ample electric accepted that flows in the coils of tubing captivated about the poles. Another architecture is a Helmholtz braid blueprint but with the accepted in one of the coils reversed.1
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