Vacuum system of the Dubna heavy ion storage ring facility K4-K10

Abstract

The complex K4-K10 of two storage rings is intended to provide the beams of exotic neutron deficient and neutron excess nuclei ranging from He to Ni. High momentum resolution of cooled exotic beams ( δp/ p = 10 −5 −10 −6) and maximum energy of 150–200 MeV amu −1 are the purpose of this project. Interactions of heavy ions with the molecules of the important constituents of the residual gas are analysed. For a successful operation of the ring complex, the pressure in the vacuum chambers must not be less than 1 × 10 −8 Pa. The gas load sources are analysed and the vacuum technology of the initial preparation of the vacuum chamber materials and the procedure of reaching the desirable vacuum are defined. The structures of the vacuum systems and their different parts are described. An ultra high vacuum test bench for modelling works and examination of individual parts of the vacuum system is created.