APPLICATION OF THE BEAM PROFILE MONITOR FOR VEPP-4M TUNING CAS 2005 TRIESTE APPLICATION OF THE BEAM PROFILE MONITOR FOR VEPP-4M TUNING Andrey Zhuravlev The BEAM profile monitor data: The beam kick and beam-beam effects Beam dipole oscillations (black plot) and size Y behavior (red plot) after kick, Ie- =5.4 mA. It is the limit current for the VEPP-4M. The beam losses after a small kick and quadrupole mode instability take place. Beam dipole oscillations (black plot) and size Y behavior (red plot) after kick, Ie- = 220 A. x 64 The beam dipole oscillations (black plot) and Y behavior (red plot) during the beams convergence in the interaction point. Duration of the single turn is 1220 ns. Channel constant is 0.12 mm. Ie+= 3.4 mA, Ie- = 3.0 mA. The convergence of the beams with currents of Iе+=2.4 mA, Iе- =2.9 mA, accompanied by quadrupole instability. Technical parameters Budker Institute of Nuclear Physics The Vepp-4 Facility Technical Parameters VEPP-3 circumference 75 м VEPP-4M circumference 366 м VEPP-3 maximum energy 2000 МэВ VEPP-3 Maximum current 200 мА VEPP-4M maximum energy 6000 МэВ VEPP-4M Maximum electron/positron currents 80 мА VEPP-4M beam size 0,2 х 0,6 мм2 Collider luminosity 1.5*10 32 VEPP-3 period of revolution 0,25 мс VEPP-4M period of revolution 1,22 мс The MAPMT Technical Parameters Size 250 x 100 x 100 mm Interface 100М ethernet Internal memory ~4 М (217 beam profiles at 16 points) Discontinuity of record 1… 28 turns Analyzable frequency range 10 Hz … 1 MHz Single anode size 0.8  16 mm Arrangement and principle of operation The BEAM profile monitor data: the Beam frequencies measurement Qy Qx frequency Time amplitude Layout of the optical diagnostic system. A visible part of the SR is reflected from the cooled metallic mirror and leaves the VEPP-4M vacuum Chamber through a glass window Evolution of the betatron frequencies during scanning The Fourie-spectrum of the betatron fluctuations sy sx The typical MAPMT signal and the operating point for the amplitude measurement Vertical beam size depending on betatron frequencies