Speaker
Описание
NICA (Nuclotron-based Ion Collider fAcility) collider complex is under comissioning at JINR (Dubna, Russia). The initial configuration of the collider will support collisions of fully stripped heavy ions 124Xe and 209Bi, for investigation of phase transition in the quark-gluon plasma in the energy range 1÷4.5 GeV/u per beam. Commissioning of the collider injection chain has been started in 2021. The complex includes two linacs, Booster and Nuclotron superconducting synchrotrons to provide the beam injection in to the 503 m collider rings at the collision energy up to 3.9 GeV/u. The design luminosity is ~10^27 cm−2∙s−1 at the beam energy 4.5 GeV/u. The heavy ions are generated in the electron string ion source with intensity ~5∙10^8 per pulse. After acceleration by the linac and Booster ring the beam stripping and nucleus are accelerated by the Nuclotron ring and injecting into the Collider. The electron cooling at 3.2 MeV/u in Booster used for accumulating of the beams in the Booster ring with multi times injections. The electron and stochastic cooling are used in each of collider ring to support beam accumulation and to prevent emittance growth due to intrabeam scattering. Three RF systems of the collider are used for longitudinal phase space manipulations: RF-1 – barrier bucket system for the beam accumulation, RF-2 makes initial bunching to 22 bunches from a costing beam, and RF-3 at the 66th revolution harmonic operating at the collisions.
Status of commissioning of the NICA accelerators complex are shortly discussed.
