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A Bitter electromagnet or Bitter solenoid is a type of electromagnet made of circular metal plates and insulating spacers stacked in a helical configuration, rather than coils of wire. This design was invented and built in 1933 by American physicist Francis Bitter. In his honor the plates are known as Bitter plates.

Bitter electromagnets are used to produce extremely strong magnetic fields (up to 60 teslas as of 2006). The stacked plate design is mechanically very sturdy, to withstand the outward pressure produced by Lorentz forces, which increase with the square of the magnetic field strength. Additionally, water circulates through holes in the plates as a coolant, since resistive heating also increases with the square of the magnetic field strength.

Despite the drawback of resistive heating, Bitter electromagnets are used where extremely strong fields are required because superconducting electromagnets cannot operate above the field strength at which the magnet materials cease to be superconducting (typically on the order of 10 to 20 teslas, due to flux creep, though theoretical limits are higher).

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