The estimation and control of closed orbit in fast cycling synchrotron

The quality of the closed orbit regulation and optimization in synchrotron depends on the composition and the quality of the beam parameters measurements and the methods of the control action development based on this measurements-In the existing closed orbit correction systems the beam position monitors are used as an information source and the dipole corrector magnets are used as the control devices. The algorithms of the control actions are well known in this kind of systems. In the upgrading of the existing accelerators and equipping with the automatic control systems the most important and in some cases the decisive factor of their structure is the minimization of the extra equipment with maximum usage of existing control system. In Yerevan synchrotron the beam observation system consists of the beam intensity monitors and the affairs of making precise BPM were failed because of bad noise immunity. From the other side the closed orbit correction 2 bump scheme doesn't give pure local correction, without distorting the closed orbit in the other part of the ring (the residual distortion is about 25% of the maximum local displacement). Here a set of algorithms of closed orbit estimation and correction on the magnetic field injection level is presented, which do not need the system of BPM