Abstract
With the increase of the application of turbomolecular pumps in plasma physics the problem of strong magnetic fields in the vicinity of the turbomolecular pumps comes up more and more frequently. If the rotor of a turbomolecular pump turns with high speed in a magnetic field eddy currents in the rotor will cause undesirable heating of the pump. The maximal magnetic flux density specific for each turbomolecular pump is determined by experiment for a series of pumps. For higher densities of the magnetic field shielding elements must be applied, because excessive heating of the pump rotor would cause destruction of the pump.
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