Main magnet of the cyclotron. (a) The whole main magnet. (b) Magnet pole.
A 1/8 TOSCA model of Magnet.
The median plane magnetic field distribution.
Comparison of the FEM predicted magnetic field with the measured values. “Fem_original” is the FEM prediction using the original B-H curve, and “Fem_modified” is the FEM prediction using the modified B-H curve. The isochronous average field is also shown in (a). The coil current is 125 A. (a) Azimuthally average field. (b) Prediction error.
The original B-H curve provided by the steel supplier and its modification.
The isochronous field error . Note that need to be shimmed only in the interval 5.5 cm < r < 28 cm, exclusive of the central region.
A “standard patch” p i and resulted azimuthally average magnetic field change b i .
Representation of the shimming curve with standard patches. (a) The shimming curve. (b) Decomposition of the shimming curve.
The second formal shimming of the main magnet.
Final azimuthally average magnetic field.
Main parameters of the magnet.
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