NICA Facility in Polarized Proton and Deuteron Mode

A D Kovalenko,A M Kondratenko,A V Butenko,V A Mikhaylov,Yu N Filatov,M A Kondratenko,V D Kekelidze

doi:10.1142/s201019451660096x

Abstract

NICA project at JINR is aimed at the experiments with polarized protons and deuterons at both as fixed target and colliding mode over beam momentum range from 2 to 13.5[Formula: see text]GeV/c. Polarized beams are injected into collider from the Nuclotron-superconducting synchrotron. Dynamic solenoid “Siberian snakes” are proposed to prevent resonance depolarization of proton beam during acceleration in the Nuclotron up to momentum of 6 GeV/c and further in the collider up to the maximum momentum after storage and stochastic cooling of necessary number of particles in each ring. By means of pair of the Snakes placed in the opposite collider straight sections “spin transparency” mode is provided. Stabilization and control of the polarization is reached due to “weak field” solenoids integrated in the lattice. The proposed scheme of the polarization control is universal and can be used for different ion spices (p, d, t, He3…).

Highlights

NICA project at JINR is aimed at the experiments with polarized protons and deuterons at both as fixed target and colliding mode over beam momentum range from 2 to 13.5 GeV/c
In this paper we briefly describe the status of design the NICA technical concept in the context of polarized proton and deuteron beams
Of NICA complex (Fig. 1) include the heavy ion source and source of polarized ions SPI, with corresponding linacs, existing superconducting accelerator, 6 A · GeV strong-focusing synchrotron — Nuclotron, new superconducting Booster synchrotron, the collider NICA with two detectors — MPD (Multi-Purpose Detector) for heavy ion studies and SPD (Spin Physics Detector), as well as experimental hall for fixed target experiments with beams extracted from the Nuclotron

Summary

NICA Facility in Polarized Proton and Deuteron Mode

Polarized protons To eliminate crossing of numerous dangerous depolarizing spin resonances in Nuclotron in the case of protons, solenoid Siberian snake will be installed into the second straight section of the accelerator ring [9]. The analysis of particle dynamics in the case of a strong coupling of betatron oscillations due to the solenoid snake has been performed It was shown [10], stable operation of the accelerator in polarized mode can be provided without the use of additional compensating quadrupoles. Such approach makes it possible the most effective use of free space and reduce substantially the maximum of the solenoid field amplitude.

Full Snake

Weak solenoid for polarization control number

Findings

Conclusion