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quadrupole field

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quadrupole field [′kwä·drə‚pōl ‚fēld]
(electromagnetism)
An electric or magnetic field equivalent to that produced by two electric or magnetic dipoles whose dipole moments have the same magnitude but point in opposite directions, and which are separated from each other by a small distance.
The field produced by a quadrupole lens.


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The magnetic field must be oriented in three mutually perpendicular directions with respect to the trap electrodes, which are the source of the external quadrupole field, but with the same magnitude of the magnetic field.
The more complicated quadrupole field would be created by two bar magnets laid end to end with their respective north or south poles touching.
 
 
 
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