The Legnaro CRYSTAL proposal

The conceptual design of a low-energy heavy-ion storage ring, called CRYSTAL, proposed for the experimental demonstration of Crystalline Beams is presented. The design of the project has been optimized for the study of crystalline beams; bru provisions have also been made for carrying out experiments for different nature in nuclear, atomic and molecular physics. The tandel-ALPI heavy-ion facilities of the Laboratori Nazionali di Legnaro is assumed as the injector for the storage ring. For the Crystalline mode the possibility to inject particles from an indipendent low energy source is also considered. The storage ring has a circumference of 70 m, large enough to allow a maximum magnetic rigidity of 3.8 Tm. It has a periodicity of eight, made of eight dipole magnets surrounded by doublet quadrupoles, sextupoles and a drift space free of magnets 3.4 m long. The demonstration of Crystalline beams is feasible with very effective electron and laser cooling and requires dedicated diagnostics. The existence of stable ground state for Crystalline Beams has been demonstrated by computer simulations. The basixc structures are the helices and twisted multiplets. The ground state configurations depend on the focusing parameters of the storage ring. The transition thresholds from one ground state to another depends on the focusing parameters and particles density