| Abstract: | As the hill gap is required to increase by -1 cm due to the installation of RF, centering coils, beam diagnostics and etc., several adjusted geometries of the main magnet are investigated numerically and the new magnetic field distribution is provided for beam dynamics study in both acceleration and central region. Obviously, many key parameters of the magnet, e.g. the profile of hill gap, shimming bar, central plug, have to be re-designed while the excitation current is adjusted. In the year 2005, the basic geometry and its field distribution design were fixed, and many engineering aspects were in progress, including the mechanical structure design and construction preparation. |
