Accelerator Diagnosis ? hd Control by Neural Nets

Neural Nets(NN) have been described as a solution looking for a problem. In the last conference, Artificial InteIligence(A1) was considered in the accelerator context. While good for local surveillance and control, its use for large complex systems(LCS) was much more restricted. By contrast, NN provide a good metaphor for LCS. It can be argued that they are logically equivalent to multi-loop feedback/forward control of faulty systems and therefore provide an ideal adaptive control system. Thus, where AI may be good for maintaining a 'golden orbit: NN should be good for obtaining it via a quantitative approach to 'look and adjust' methods like operator tweaking which use pattern recognition to deal with hardware and software limitations, inaccuracies or errors aa well as imprecise knowledge or understanding of effects like annealing and hysteresis. Further, insights from NN allow one to define feasibility conditions for LCS in terms of design constraints and tolerances. Hardware and software implications are discussed and several LCS of current interest are compared and contrasted.