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The results of the first run (December 2020) for the commissioning of the new superconducting synchrotron Booster at the Joint Institute for Nuclear Research are presented. Vacuum conditions and measurements of the lifetime of the single-charged helium ion beam at injection energy of 3.2 MeV per nucleon have been analyzed and the acceleration of ions up to energy of 100 MeV per nucleon has been demonstrated. The measured lifetime of the beam $${{\tau }_{{\exp}}} = (1.32 \pm 0.06)$$ s is compared to the theoretical value $${{\tau }_{{{\text{theor}}}}} = (1.74 \pm 0.50)$$ s calculated with original program code. The results of the first switching-on of the electron cooling system are presented.

The lattice of the NICA collider includes 80 twin-aperture superconducting dipole magnets. Measurements of the magnetic field parameters should be done for both apertures of each collider magnet. For the time being 25% of the magnets are successfully passed the tests. This paper describes the state of serial magnetic measurements and results of test at helium temperature.

The NICA accelerator complex will consist of two injector chains, a new 600 MeV/u superconducting booster synchrotron, the existing superconducting synchrotron—Nuclotron, and the new superconducting collider that has two storage rings each of about 503 m in circumference. The influence of the fringe fields and misalignments of the structure magnets, the field imperfections and natural chromaticity should be corrected by the correction system. The main parameters, arrangements and the field calculations of the corrector magnets are presented.

NICA is an international project accelerator collider complex under construction at the Joint Institute for Nuclear Research in Dubna. The facility is aimed at providing collider experiments with heavy ions up to gold in the center of mass energy from 4 to 11 GeV/u and an average luminosity up to 1 $\times\, 10^{27}$ cm $^\mathbf {-2}$ s $^\mathbf {-1}$ for Au $^{79+}$ . Collision experiments with polarized deuterons and protons are also foreseen. The facility includes two injector chains, a new superconducting booster synchrotron, the existing 6 AGeV superconducting synchrotron Nuclotron, and a new superconducting collider consisting of two rings, each 503 m in circumference. The planned FAIR synchrotron SIS100 has to deliver high-intensity beams for the FAIR project at GSI, Darmstadt. This machine will use fast-cycling 4 T/s magnets with a magnetic field up to 2 T. The NICA booster synchrotron, the NICA collider, and the heavy ion synchrotron SIS100 are based on iron-dominated window frame-type magnets with a hollow superconductor winding analogous to the Nuclotron magnet. Progress in the manufacturing and testing of the NICA magnets and the SIS100 superconducting magnets is presented.

The magnetic system of the NICA collider includes 80 twin-aperture superconducting dipole magnets. Measurements of the magnetic-field parameters should be done for both apertures of each collider magnet. This paper describes the methods, the first results of magnetic measurements, and developments of a dedicated system for mass-produced dipole magnets of the NICA collider.

The quality of booster closed-orbit correction is estimated. The distribution of the maximum orbit distortion in both directions and the results of numerical simulation using the singular value decomposition method are given. The estimation of closed-orbit distortion with the worst correction quality is given.

NICA is a new accelerator complex under construction at JINR in Dubna. For the NICA booster synchrotron and NICA Collider requires more than 390 superconducting magnets. The magnetic system of the booster of NICA project includes 48 quadrupole superconducting magnets. The paper describes a probe designed for series magnetic measurements of the doublet of quadrupole lenses for the booster, as well as methods of measurement. Presents the first results of cryogenic measurements for the two doublets of quadrupole.

The international project “NICA” (Nuclotron-based Ion Collider fAcility) is an accelerator complex which is under construction at the Joint Institute for Nuclear Research (Dubna, Russia). Basing on the NICA project demands NRC “Kurchatov Institute” (Moscow, Russia) designed and manufactured two trial 12 kA 1G current leads (CLs) intended for powering of the JINR superconducting magnets test bench. The main requirements for the CLs were: a reliable and robust design, usage of liquid nitrogen from the NICA cooling circuits as a resistive section coolant, low resistance joints, current ramp rates up to 10 kA/s and the total heat load to the 5 K end not exceeding 0.4 W/kA per one CL. An in-situ cold test of the trial 12 kA CLs held at JINR in 2015 demonstrated the operational reliability of our technological approaches. Following the successful test results the serial production of 20 pairs of 10.5 kA HTS CLs with very few design updates for the accelerator powering started. The first 10 pairs were fabricated, tested and shipped to JINR as a part of the NICA commissioning framework in June 2017. All the CLs fulfilled the acceptance test requirements. The production of the remaining 10 pairs is to be finished in 2018. The paper gives an overview of the 12 kA and 10.5 kA HTS CLs’ design, discusses their thermal, magnetic and electrical characteristics and presents the acceptance tests results. We also compare our CLs with earlier works by other groups in the context of HTS stack-and-soldering technique, joints’ resistances, relative heat loads into the cryogenic environment etc.

Nuclotron-based ion collider facility (NICA) is an international project-accelerator collider complex under construction at the Joint Institute for Nuclear Research in Dubna. The facility is aimed at providing collider experiments with heavy ions up to gold in the center of mass energy from 4 to 11 GeV/u and an average luminosity up to 1·1027 cm−2·s−1 for Au79+. Collision experiments with polarized deuterons and protons are also foreseen. The facility includes two injector chains, a new superconducting booster synchrotron, the existing 6 AGeV superconducting synchrotron Nuclotron, and a new superconducting collider consisting of two rings, each 503 m in circumference. The planned FAIR synchrotron SIS100 has to deliver high intensity beams for the FAIR project at GSI, Darmstadt. This machine will use fast-cycling 4 T/s magnets with a magnetic field up to 2 T. The NICA booster synchrotron, the NICA collider, and the heavy ion synchrotron SIS100 are based on iron-dominated “window frame”—type magnets with a hollow superconductor winding analogous to the Nuclotron magnet. The status on the manufacturing and testing of the NICA magnets and the SIS100 superconducting quadrupole and corrector magnets are discussed.

Nuclotron-based Ion Collider fAсility (NICA) is a new accelerator collider complex currently under construction at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. The facility includes a new superconducting booster synchrotron whose layout includes 40 dipole and 48 quadrupole superferric magnets. Booster magnets are under serial production, assembling and testing at the new test facility at JINR, Dubna. The designs of NICA magnets are based on the Nuclotron magnet design. The dipole magnets for the NICA booster have a length of 2.14 m, an aperture of 128/165 mm, and a curved yoke with bending radius of 14.1 m. Two quadrupole magnets are connected together to form a doublet. Measurement of the magnetic field parameters are assumed for each booster magnet. 80% of the dipole magnets and 10% of the doublets have successfully passed the tests. We present the cold test results that were obtained from the magnetic measurements of dipole magnets and compare them with the requirements of the specification. Preliminary results of cold magnetic measurements of the first serial doublets are summarized here.

In the 1990s, for Nuclotron, the pioneer accelerator using fast ramped superconducting magnets, a novel cable with superconducting strands wrapped around a cooling tube was developed. Such cable fabrication technology was advanced and adopted for the SIS100 or NICA project. In parallel with major application for fast ramped superferric magnets, application for high field magnets with a cosine-theta type is investigated. In this paper, we give an overview of the history of Nuclotron-type cables, list its advantages, and outline its applicability far beyond the original usage field.

Joint Cryogenic Engineering Conference (CEC) / International Cryogenic Materials Conference, ICMC, Hartford, United States, 21 Jun 2019 - 25 Jun 2019; IOP conference series / Materials science and engineering 755, 012133 (2020). doi:10.1088/1757-899X/755/1/012133, Published by IOP Publ., London [u.a.]

The schematic diagram, design, and technical characteristics of the pulsed current source developed and produced for the magnetic-field measurement system of superconducting magnets for accelerators are described. The current source is based on the current regulator with pass transistor bank in the linear mode. Output current pulses (0–100 A) are produced by utilizing the energy of the preliminarily charged capacitor bank (5–40 V), which is additionally charged between pulses. The output current does not have the mains frequency and harmonics ripple. The relative noise level is less than–100 dB (or 10–5) of RMS value (it is defined as the ratio of output RMS noise current to a maximal output current of 100 A within the operating bandwidth, expressed in dB). The work was performed at the Veksler and Baldin Laboratory of High Energy Physics, Joint Institute for Nuclear Research (JINR).

Serial assembly and tests of dipole and quadrupole magnets of the NICA Booster have started at the Laboratory of High Energy Physics of the Joint Institute for Nuclear Research (JINR). The accelerator is fitted with Nuclotron-type magnets with a superconducting winding and an iron yoke for shaping the needed magnetic field. The design of magnets for NICA was optimized (based on the experience gained in constructing and operating the JINR Nuclotron) for the production of magnetic fields of the required configuration in terms of the beam dynamics in the accelerator and the collider. Measurements of parameters of the field of each magnet are expected to be performed in the process of assembly and testing of each module of the magnet-cryostat system of the NICA Booster and Collider. The results of magnetic measurements for the NICA Booster dipole magnet are presented.

The Facility for Antiproton and Ion Research (FAIR) is currently being constructed at GSI Darmstadt. Around 500 superconducting magnets are being procured for the heavy ion synchrotron SIS100, and around 180 are being procured for the Super Fragment Separator (Super-FRS). All these magnets have to be tested at cryogenic temperature in order to verify and guarantee their performances before they are installed in the tunnel. Test stations, measurement equipment, and the required infrastructure are being built up at the host laboratory and, due to the large number of magnets and testing requirements, at CERN and JINR. We report on the plans, testing strategy, developments, and, particularly, the status of preparations for testing of the SIS100 dipoles at GSI.

Nuclotron-based Ion Collider fAcility (NICA) is a new accelerator collider complex under construction at the Joint Institute for Nuclear Research. The facility is aimed at providing collider experiments with heavy ions up to Gold in the center of mass energy from 4 to 11 GeV/u and an average luminosity up to 1 · 10 27 cm -2 s -1 for Au 79+ . The collisions of polarized deuterons are also foreseen. The facility includes two injector chains, a new superconducting booster synchrotron, the existing 6-AGeV superconducting synchrotron Nuclotron, and a new superconducting collider consisting of two rings, each 503 m in circumference. The booster synchrotron and the NICA collider are based on an iron-dominated “window frame”-type magnet with a hollow superconductor winding analogous to the Nuclotron magnet. The status of the serial production and test of the magnets for the booster synchrotron and the development of the full-size model magnets for the NICA collider is presented. The test results of magnets are discussed. The status of the construction of the facility for serial tests of superconducting magnets for the NICA project is described.

SIS100, i.e., the core component of the FAIR project, is now heading into the realization phase. While the First of Series SIS100 dipole has already been produced and tested, the main quadrupole magnets are now being designed with the first magnets being built. For these magnets, we report on the first experience of production technology adjustment concentrated on field quality optimization. Along these high-current magnets, the low-current correctors and the special quadrupoles of the injection and extraction modules are made of a Nuclotron cable with insulated strands. This design implies significant different cooling conditions and was first implemented in the chromaticity sextupole. This sextupole was produced last year and was thoroughly tested this year. We report on the status of the various magnets, comment on the optimizations on the first step toward series production, and report on the test results of the first low-current corrector magnet.

Journal of Instrumentation 15(12), T12013 - T12013 (2020). doi:10.1088/1748-0221/15/12/T12013, Published by IOP Publ., London

Particle accelerator complex NICA (Nuclotron-based Ion Collider fAcility) comprises superconducting Booster and Nuclotron synchrotrons which magnets operating at pulse mode in opposite phase with period of about 4 seconds. Summary stored energy of Booster and Nuclotron magnets will vary from 1 to 2.6 MJ during the period. NICA power supply system can be significantly improved by Superconducting Magnetic Energy Storage (SMES) application that will help to move the energy back and force between Booster and Nuclotron. The useful energy at this SMES must be about 1.6 MJ so the maximum total SMES energy should be 3-5 MJ. SMES with this energy should have several Tesla magnetic fields to keep a reasonable size. SMES operating current can be not less than Booster and Nuclotron magnets current so it might be 10-12 kA. It is better to make such a SMES magnet from an HTS (high temperature superconductor) cable for the stability at 6-7 T and 4 s pulse mode. The SMES magnet is planned to be wound as a short solenoid (Brooks coil) of cables optimized for several coaxial sections. HTS cables with helical structure similar to well-known CORC (conductors on round core) cables are under the development at JINR. The HTS cabling technology is based on the same principle as Nuclotron type cable manufacturing technology. HTS tapes, cables and magnets experimental study and testing methods are being developed on the base of an existing test facility at LHEP. First HTS cable short sample with 6 HTS tapes was prepared and tested at 77 K in self-field. Its critical current is about 800 A that will allow achieve required operating currents of SMES magnet with a reasonable amount of HTS tapes in cables. Developments of high field high current fast cycling HTS magnets for accelerators are also being planned at JINR.

Generation of magnetic field in units of booster synchrotron for the NICA project is one of the most important conditions for getting the required parameters and qualitative accelerator operation. Research of linear and nonlinear dynamics of ion beam 197Au31+ in the booster have carried out with MADX program. Analytical estimation of magnetic field errors tolerance and numerical computation of dynamic aperture of booster DFO-magnetic lattice are presented. Closed orbit distortion with random errors of magnetic fields and errors in layout of booster units was evaluated.

NICA is a new accelerator collider complex under construction in JINR, Dubna. More than 390 SC-magnets are needed for the NICA booster and collider. One of the parameters measured during the cold testing of superconducting magnets for the NICA project is the dynamic heat releases in the magnet at pulse operation mode. These losses are due to eddy currents, hysteresis losses and other effects. The system for measuring of dynamic heat releases in the SC-magnets by electrical method that is implemented at the facility for testing of superconducting magnets at JINR is described. The results of measured dynamic heat releases in the dipole magnets at series tests are presented.