Magnetic properties of the ALS booster synchrotron engineering model magnets

The Advanced Light Source (ALS) is designed to be a third generation electron storage ring producing high-brightness VUV (Vacuum in Ultraviolet) and X-ray radiation from wiggler and undulator insertion devices. Engineering models of all lattice magnets that are to be installed in the storage ring and its booster synchrotron have been built and are being tested to verify their performance. Attention is given to the magnets that form the booster lattice: dipoles, quadrupoles, sextupoles, and corrector dipoles (steerers). After a brief outline of measurement techniques and equipment, the major design parameters of these magnets are listed. Measured effective lengths and multipole field errors are then given for each type. All engineering models meet the specifications, and tracking studies including the measured systematic field errors show acceptable performance of the booster synchrotron; the designs are qualified for production. >