SPD Introduction

The opportunity to have high luminosity collisions of polarized protons and deuterons in the NICA collider allows for studies of a great variety of spin and polarization dependent effects in hadron-hadron collisions:

  • Drell-Yan pair, J/ψ and prompt-photon production with longitudinally and transversely polarized p and d beams aiming at extraction of unknown (poorly known) parton distribution functions;
  • spin effects in baryon, meson and photon production in various exclusive reactions;
  • diffractive processes;
  • multiquark states and correlations;
  • studies of cross sections, spin asymmetries (Krisch effect) and spin-dependent amplitudes in elastic scattering.

The principal aim of this project is to elaborate a design concept for a Spin Physics Detector, capable to exploit the mentioned above spin physics potential of the NICA collider. The physics program,requirements for the detector and the design ideas are based on the submitted in 2014 and endorsed by the JINR Physics Advisory Committee (PAC) for Particle Physics Letter of Intent. A formal JINR project for conceptual and technical design of the SPD project was presented at the PAC meeting in January 2019 and supported by the committee.

The SPD facility is foreseen to be allocated in the south beam interaction point of the NICA collider. The aim is to have yet simple but universal detector that could be relatively easily reconfigured and/or upgraded. The current design foresees three modules: two end-caps and a barrel section. Each part has an individual magnet system: the endcaps – solenoidal coils, the barrel – toroidal magnetic system. The main detector systems are as follows: Range System (RS) (for muon identification), Electromagnetic calorimeter (ECal), PID/Time-of-Flight system, Main Tracker (TR) and Vertex Detector (VD). The proposed three-module design gives a possibility for upgrade and modification of each of the main detector subsystems and for performing measurements with different detector configurations.