SYNCHROTRON-RADIATION COMPLEX ISI-800

Basis considerations for the choice of a synchrotron light source dedi cated for Ukrainian National Synchrotron Centre is presented. Consider ing experiments and technological processes to be carried out 800 MeV compact four superperiod electron ring of third generation was chosen. The synchrotron light generated by the electron beam with current up to 200 mA and the radiation emittance of 2.710(-8) m*rad would be uti lized by 24 beam lines. Each line will provide the light beam with spe ctral brightness of (2-9)10(20) phot/(m(2)*rad(2)) within 0.01% bandw idth. Two wigglers and an undulator will be inserted into the magnet l attice. The lattice is to provide large enough dynamic aperture and to decrease sensitivity to collective effects. The central magnet of eac h superperiod can be optionally replaced by a superconducting one to h arden photon spectrum. The 120 MeV traveling wave linac is intended to employ as an injector. The injector is placed below the ring to provi de room for more beamlines. For this purpose the injecting system and the RF cavity share the same long straight section.