AGS Lattice Corrections and Tuning Using Backleg Windings

The excitation of a novel backleg winding system has significantly contributed to increasing the intensity of the AGS. The benefits of the improved magnetic lattice properties at fields in the vicinity of injection were demonstrated, both for future operations and for quantitative study of high intensity phenomena. A record intensity of 3.2 ? 1012 protons per pulse was attained when some portions of these windings were activated. This occured approximately two years ago, too late for the previous Conference. The underlying ideas and computations preceded this date by about two years. While many turn backleg windings already existed on the AGS magnets, the appropriate systems connections had to be constructed and installed during a shutdown. It was hoped by now to have experimental studies using all the systems, but time commitments have prevented further work to date. However the ideas used and the particularly simple approach to orbit analysis developed warrants being described.