Dubna synchrophasotron. Main characteristics and beams

Fundamental scientific, technical and engineering problems which have been solved in the process of the JINR synchrophasotron modernization to use it as an accelerator of relativistic and polarized nuclei were considered. Data characterizing the operation of a new synchrophasotron injector Lu-20 one-resonator livear accelerator, multiply charged ion sources and beam transport channels are given. The synchrophasotron operates 4000h (5 runs) during a year. About 70% of this time the accelerator operates in the mode of nucleus acceleration. To carry on the investigation program on relativistic nuclear physics and other directions, on the average 85% of the accelerator time is allotted (over 30 users) and 15% - for the investigation and improvement of the modes. Idle accelerator times due to equipment faults don't exceed 6-7% of the planned time. The synchrophasotron modernization will be continued during the current five years. A high-frequency accelerating system of the accelerator will be put into commission as well as vacuum in the annular synchrophasotron chamber will be increased up to 2 x 10-7 torr due to cryogenic pumping. This will permit to increase the intensity and on-large a set of the accelerated nuclei up to argon