The NICA (Nuclotron-based Ion Collider fAcility) accelerator complex consists of a collider and an injection complex. The injection complex of heavy ions includes ion source, linear accelerator, a 25 T m SC Booster synchrotron, a 38 T m SC synchrotron Nuclotron, and beam transfer lines. One of the main tasks in complex commissioning and tuning are the measurement and correction of the beam closed orbit. The software, written for orbit correction, was successfully tested during the commissioning runs. The paper describes the software and hardware developments for orbit measurement and correction.

One of the key facilities in the chain of heavy ion injection of the NICA Collider is a new 25 T m superconducting booster synchrotron (Booster). Since commissioning of the facility in December 2020, four runs with beams of various ions have been carried out, two of which were accompanied by experiments at the BM@N facility. The first results of studying the magneto-optic characteristics of the Booster and measuring beam parameters using the correction system of the leading magnetic field are presented. The prospects of such studies in experiments and research on tuning the injection complex and the NICA Collider are also discussed.

The NICA accelerator complex intended for studying baryonic matter and research in spin physics is currently at the stage of construction and mounting at the JINR. The NICA injection complex was designed to produce heavy ions with an energy of 1–3.9 GeV/u. The injection complex consists of two new accelerators: Heavy Ion Linear Accelerator, HILAC, and the superconducting synchrotron, Booster, and the modernized superconducting synchrotron, Nuclotron. The injection facility provides heavy ion beams for the NICA collider and the fix target experiments. The results of the fourth Booster-Nuclotron beam run for fix target experiments on the BM@N setup are discussed. The completion of the facility equipment construction and mounting are also presented along with the plans of first collider runs.

The injection chain of the NICA Collider (JINR, Dubna) consists of various ion sources, two linear accelerators, a 25 T m superconducting (SC) Booster synchrotron, the existing SC synchrotron Nuclotron, and beam transfer lines. Construction of the Booster synchrotron was finished in 2020 and the first machine Run with ion beam was successfully carried out in December. So far, three commissioning Runs with various ion beams have been successfully completed. The tuning processes, the study of the beam parameters, and optical characteristics of the Booster during these Runs are presented.

In November +/- December 2020 and in September 2021, the first two beam runs of the Booster Synchrotron - a new cyclic accelerator of the NICA (Nuclotron-based Ion Collider fAcility) complex - were performed at the Laboratory for High Energy Physics, Joint Institute for Nuclear Research. New technologies (previously not used in Russia) were developed for the Booster's construction based on new physical and technological solutions. We describe these technologies and solutions and also the methods used in constructing and testing the accelerator systems. We present the results of the first two runs.

The NICA accelerator complex is developed on the JINR base in Dubna for performing physical experiments on colliding beams of heavy ions. It consists of the injection complex, booster synchrotron, upgraded Nuclotron synchrotron, and heavy-ion collider. The booster is currently under assembly. The system, developed at the LHEP JINR to perform precise temperature measurements of superconducting magnets of the booster synchrotron, is described. The thermometry system includes more than 240 resistive TVO-type temperature sensors, the National Instruments data acquisition system, software based on Tango Controls technology, and a web-client application.

NICA (Nuclotron-based Ion Collider fAcility) is a new accelerator complex being constructed at the Joint Institute for Nuclear Research (Dubna, Russia). NICA will provide collider experiments with heavy ions at a maximum energy up to 4.5 GeV/u and polarized protons at energy up to 12.6 GeV. It will consist of injection complex, superconducting booster synchrotron, the Nuclotron, and two collider rings. This report describes structure, main features, and current status of a control system (CS) based on TANGO for the booster synchrotron.

Cycling equipment was developed for the Booster accelerator of the NICA complex in the form of a VME3U crate with a set of digital and optical input/output modules, which are controlled using the FPGA module.

RestDS2 is a Tango class which implements the C++ Tango REST API. It is developed at LHEP JINR to provide web access to Tango devices of the control system of the NICA accelerator complex. The module organization, its usage, results of tests, the access control system and development progress are described.

The Nuclotron-based Ion Collider fAcility (NICA) is under construction in JINR. The NICA goals are providing of colliding beams for studies of hot and dense strongly interacting baryonic matter and spin physics. The accelerator facility of collider NICA consists of following elements: acting Alvarez-type linac LU-20 of light ions at energy 5 MeV/u, constructed a new light ion linac at ion energy 7 MeV/u with additional acceleration section for protons at energy 13 MeV, acting heavy ion linac HILAC with RFQ and IH DTL sections at energy 3.2 MeV/u, superconducting booster synchrotron at energy up 600 MeV/u, acting superconducting synchrotron Nuclotron at gold ion energy 4.5 GeV/n and two collider storage rings with two interaction points. The status of acceleration complex NICA is under discussion.

A few improvements have been made in order to enhance the resolution of the Q-measurement system such as development of the new amplification system for picking up signals. It was developed using diode detection technique, analog filtering and real-time gain adjusting to allow carry out measurements during beam injection and acceleration. Results and tests performed with the Nuclotron beam are presented.

Separate systems and devices for the future accelerator complex are developed in the framework of the NICA project. The multivariant injection scheme with five pulsed power supply sources of the inflector plates will be applied for the Nuclotron Booster. The startup variant includes one source with the largest maximum voltage equal to 62 kV. This study presents the pulsed power-supply source of the inflector plates for the Nuclotron Booster injection system. The equipment and the high voltage source control system are described and the results of testing with equivalent load are given.

WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection. This module allows carrying out both monitoring and management of TANGO devices. The module also has several modes of operation. Depending on the selected mode, you can control one or more of required tango devices. The exchange of messages between the client and the server is in JSON format.

The layout of beam extraction from a cyclic accelerator using a pulsed septum magnet is presented. The magnetic field pulse duration is about 10 μs; the amplitude is about 1 T. The conceptual design of the septum and the power-supply circuit are described. The power-supply pulse generator provides a current of about 100 kA in the current loop with an inductance of 1 μH.

TANGO Controls is a basis of the NICA control system. The report describes the software which integrates the Nuclotron beam slow extraction subsystem into the TANGO system of NICA. Objects of control are power supplies for resonance lenses. The software consists of the subsystem device server, remote client and web-module for viewing the subsystem data.

Precise temperature control in various parts of the magnet and thermostat is one of the vital problems during cryogenic tests. The report describes design of the thermometry system, developed at LHEP JINR. This system is the operational prototype for the NICA thermometry system. Besides, the report describes generic software tools, developed for the TANGO-based control system web client software design.

The Nuclotron is a 6 GeV/n superconducting proton synchrotron operating at JINR, Dubna since 1993. It will be the core of the future accelerating complex NICA which is under construction now. The TANGO based control system of the accelerating complex is under development now. The report describes its structure, main features and present status.

A betatron tune measurement system was developed and tested at the Nuclotron. A white noise and chirp signals were used for transverse beam motion excitation. A custom FlexRIO digitizer module was developed which provides excitation signal generation for kicker electrodes and real-time signal acquisition from pickup electrodes. A high resolution FFT algorithm was implemented inside a NI PXI FPGA module, connected to digitizer. The measurement system is integrated with the NICA control system based on the TANGO Controls. Results and tests performed with the Nuclotron beam are presented.

The design of the complex envisions the installation of three pairs of electric deflecting plates in the booster ring. These plates are designed to carry out the ion-beaminjection into the booster in regimes of single-turn, multiturn, and multiple injection. We present a feasible scheme of a power-supply circuit that allows for all the prospective injection regimes through independent unipolar charging and discharging of the plates.

The new scheme of injection kicker elements distribution is described. Parameters of the circuit main elements are estimated. The system allows producing flat top of the injection pulse with high evenness. The suggested design allows building reliable and cost effective injection system satisfying the project parameters.