Beam Dynamics on ACO

After a shut down of several months during which some improvements were made on ACO such as a computer control of the power supplies, and a new detector for high energy experiments was installed, an extensive beam experiment program was started. This mainly concerned the beam-beam effect with and without small beam separation at the crossing point, the cure of transverse instabilities with new sextupolar coils placed inside the quadrupoles, the check of power supplies stabilizations by means of the synchrotron frequencies, and the development of a new ACO structure with low ß´s. During the same period new measurements of the neutral modes of the ¿o were started on ACO. Finally a beam of synchrotron light extending up to 10 Ã… will soon be put in operation for molecular, atomic, and solid state physics. The typical luminosity at 510 MeV is now about 3.4.1032 cm-2.h-1 with 35 mA in each beam, and this new improvement seems to be related to a better power supplies stabilization.