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A Helmholtz coil is a device for producing a region of nearly uniform magnetic field, named after the German physicist Hermann von Helmholtz. It consists of two electromagnets on the same axis, carrying an equal electric current in the same direction.
A gradient-field Maxwell coil has essentially the same geometry of the 3-coil configuration above, but the central coil is removed to leave only the smaller two coils, and the current in one of these is reversed. [3] This produces a uniform-gradient magnetic field near the centre of the two coils.
Helmholtz coil, Maxwell coil - air-core coils which serve to cancel an external magnetic field Degaussing coil - a coil used to demagnetize parts Voice coil - a coil used in a moving-coil loudspeaker , suspended between the poles of a magnet.
A pair of Helmholtz coils produces a uniform and measurable magnetic field at right angles to the electron beam. This magnetic field deflects the electron beam in a circular path. By measuring the accelerating potential (volts), the current (amps) to the Helmholtz coils, and the radius of the electron beam, e/m can be calculated. [8]
Two coils in an anti-Helmholtz configuration are used to generate a weak quadrupolar magnetic field; by convention, the coils are separated along the -axis.In the proximity of the field zero, located halfway between the two coils along the -direction, the field gradient is uniform and the field itself varies linearly with displacement from the field zero.
In some designs of quadrupoles using electromagnets, there are four steel pole tips: two opposing magnetic north poles and two opposing magnetic south poles. The steel is magnetized by a large electric current in the coils of tubing wrapped around the poles. Another design is a Helmholtz coil layout but with the current in one of the coils ...
English: Cross section of B (magnetic field strength) magnitude in a Helmholtz coil (actually consisting of two coils: one at the top, one at the bottom in the plot). The eight contours are for field magnitudes of 0.5 {\displaystyle B_0}, 0.8 {\displaystyle B_0}, 0.9 {\displaystyle B_0}, 0.95 {\displaystyle B_0}, 0.99 {\displaystyle B_0}, 1.01 {\displaystyle B_0}, 1.05 {\displaystyle B_0}, and ...
The higher the coil current, the stronger magnetic field and thus smaller radius of the circular path of the electrons. The strength of the magnetic field and the Lorentz force are proportional to each other, such that when the Lorentz force increases. A larger Lorentz force will deflect the electrons more strongly, so the orbit will be smaller.
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