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Based on the pervious conceptual design work,we carried out further physical design recently.A 3D FEA model of the magnet is built(as is shown in Fig.1)and the isochronous magnet field is obtained by iterative optimization of the magnet structure.Fig.2 shows the differential phase error of the field,which is within 0.05 percent except the extraction region.After that the accelerating orbit is calculated.In the
Based on the pervious conceptual design work, we carried out further physical design recently. A 3D FEA model of the magnet is built (as shown in Fig. 1) and the isochronous magnet field is obtained by iterative optimization of the magnet structure. .2 shows the differential phase error of the field, which is within 0.05 percent except the extraction region. After that the accelerating orbit is calculated.