Measurement of the Titanium Vacuum Chamber Eddy Current Fields and Pole Face Winding Corrections for the Zero Gradient Synchrotron (ZGS)

The titanium vacuum chambers (TVC) which will be installed in the ZGS are equipped with pole face windings for correction of the eddy current fields. A prototype of the chamber and correction windings has been installed in a spare magnet block test fixture for measurement of the eddy current fields as a function of radial position and time. The ten difference signals from 20 test coils are read into a SEL-810A computer. The computer displays the measured gradient on a scope, either as a function of radial position at a selected time during the magnet pulse or as a function of time at a selected position. Thus, the result of applying compensating pulses to the pole face windings can be shown directly.