Correction of eddy current errors in electron beam deflection

When electron beams are to be rapidly and accurately deflected by magnetic means, there are some cases in which the deflection yoke is surrounded by a conducting magnetic tube. Eddy currents are set up in the tube which result in time-dependent positional errors. A simplified treatment of the problem shows how the positional errors can be reduced by means of compensating coil pairs or hybridized saddle-toroidal yokes. © 1973 American Institute of Physics.