Computer calculations of the magnetic field of alternating gradient synchrotron magnets

The computer program SIBYL for computing the magnetic fields of magnets has been applied to computing the magnetic field of the Brookhaven AGS magnets and a Brookhaven septum magnet. This report presents the SIBYL computer results and compares them with experimentally measured results. The SIBYL computer program was applied to computing the magnetic field along the azimuthal center of the AGS magnets. This calculation gave the magnetic gradient along the azimuthal center of the magnet. In order to investigate the orbits of an accelerator, it is necessary to have information about the azimuthal variation of the magnetic field, or what is usually called the effective length of the magnet. The SIBYL computer program has been applied to the calculation of the effective length of AGS magnets.