Dynamic aperture of the ALS booster synchrotron

Effects of the anticipated lattice imperfections on the dynamic aperture of the ALS (Advanced Light Source) booster synchrotron were studied using a particle tracking method. The dynamic aperture was found to be sufficiently large at the selected operating points and at the designed repetition rate. Measurements of the Lawrence Berkeley Laboratory engineering model magnets confirm that magnets meet the design specifications conservatively. Based on the tracking computations, it is concluded that the expected lattice imperfections of the ALS booster synchrotron are acceptable for the selected operating conditions. Repetition rates below 2 Hz are definitely acceptable, and operations up to 4 Hz may be possible depending on the accuracy of the injection orbit. A thinner vacuum chamber is required if a higher repetition rate is desired. Power suppliers for the booster magnets are being designed for a repetition rate of 1 Hz.<>