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Magnetic field calculation for a 10 MeV positron emission tomography cyclotron
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Image of FIG. 1.
FIG. 1.

Main magnet of the cyclotron. (a) The whole main magnet. (b) Magnet pole.

Image of FIG. 2.
FIG. 2.

A 1/8 TOSCA model of Magnet.

Image of FIG. 3.
FIG. 3.

The median plane magnetic field distribution.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

The original B-H curve provided by the steel supplier and its modification.

Image of FIG. 6.
FIG. 6.

The isochronous field error . Note that need to be shimmed only in the interval 5.5 cm < < 28 cm, exclusive of the central region.

Image of FIG. 7.
FIG. 7.

A “standard patch” and resulted azimuthally average magnetic field change .

Image of FIG. 8.
FIG. 8.

Representation of the shimming curve with standard patches. (a) The shimming curve. (b) Decomposition of the shimming curve.

Image of FIG. 9.
FIG. 9.

The second formal shimming of the main magnet.

Image of FIG. 10.
FIG. 10.

Final azimuthally average magnetic field.


Generic image for table
Table I.

Main parameters of the magnet.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic field calculation for a 10 MeV positron emission tomography cyclotron