VACUUM-SYSTEM OF THE DUBNA HEAVY-ION STORAGE-RING FACILITY K4-K10

The complex K4-K10 of two storage rings is intended to provide the bea ms of exotic neutron deficient and neutron excess nuclei ranging from He to Ni. High momentum resolution of cooled exotic beams (delta p/p = 10(-5)-10(-6)) and maximum energy of 150-200 MeV amu(-1) are the purp ose of this project. Interactions of heavy ions with the molecules of the important constituents of the residual gas are analysed. For a suc cessful operation of the ring complex, the pressure in the vacuum cham bers must not be less than 1 x 10(-8) Pa. The gas load sources are ana lysed and the vacuum technology of the initial preparation of the vacu um chamber materials and the procedure of reaching the desirable vacuu m are defined. The structures of the vacuum systems and their differen t parts are described. An ultra high vacuum test bench for modelling w orks and examination of individual parts of the vacuum system is creat ed.