On the Performance of Computer Automatic Tuning at the Unilac

The Unilac is a multi-particle, variable energy linac. Automatic tuning procedures have been used in routine operation for many years. The algorithms were developed for transverse beam optimization at the linac and the transport lines in the experimental area. A successful application demands a thorough understanding of the machine, which results in a good computer modeling. It will be shown that linear treatment of the beam dynamics is normally sufficient, limitations for special sections of the accelerator will be discussed. Complementary, limitations in hardware, e.g. misalignment of components, tolerances in magnetic strengths and in beam diagnostics, affect the effectiveness of the procedures.