STATIC AND DYNAMIC BEHAVIOR OF THE SIS DIPOLE MAGNET

The dipole magnet of the Heavy Ion Synchrotron SIS is operated at fiel ds of up to 1.8 T. Thus the non-linearity of the magnetisation and hys teresis effects of the order of 0.1% cannot he neglected. The effectiv e length is not constant, but varies with the magnetization of the mag net. Eddy currents due to the planned high ramp rate of 4 T/s in the l aminations, the magnet coil, and in the vacuum chamber affect the fiel d quality of the magnet. Long time;constants of almost one second due to field components orthogonal to tile laminations were observed.