Pavel Akishin

Superconducting Magnets for the NICA Accelerator Complex in Dubna

NICA is the new accelerator complex being under design and construction at JINR. The facility is aimed at providing collider experiments with heavy ions up to Uranium in a center of mass energy range from 4 to 11 GeV/u and an average luminosity up to 1027 cm-2 · s-1. The collisions of polarized deuterons are also foreseen. The facility includes two injector chains, a new superconducting Booster synchrotron, the existing 6 A · GeV superconducting synchrotron-Nuclotron, and the new superconducting Collider consisting of two rings of about 500 m circumference each. 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 design and construction of the full size model magnets for the Booster synchrotron as well as for the NICA Collider is presented.

Magnetic Field Analysis for Superferric Accelerator Magnets Using Elliptic Multipoles and Its Advantages

The Facility for Antiproton and Ion Research (FAIR) will build a set of accelerators and storage rings at the Gesellschaft fur Schwerionforschung (GSI). Nearly all of them transport beams of elliptical shape (SIS 100, CR, NESR, RESR, SuperFRS). Magnetic field calculations as well as magnetic measurements provide precise field information, which is used to improve the properties of the machines using numerical simulations. In this report we develop elliptical multipoles fulfilling the Laplace equation which enable us to describe the field within the whole aperture consistently. Further we show how circular multipoles valid within the elliptic aperture can be derived. We illustrate the advantage of this data representation on the FEM calculations performed during the SIS 100 R&D along with an approach to measure such fields using rotating coils and estimate the influence of measurement artifacts.

Superconducting Magnets for the NICA Accelerator Collider Complex

NICA is a new accelerator collider complex under construction at JINR. The facility is aimed at providing collider experiments with heavy ions up to Uranium in a center of mass energy range from 4 to 11 GeV/u and an average luminosity up to 1027 cm -2 s-1. 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 of about 500 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 development of the full size model magnets for the booster synchrotron as well as for the NICA collider is presented. The test results of model magnets are discussed. The status of the creation of a facility for serial tests of superconducting magnets for the NICA project is described.

Superconducting SIS100 Prototype Magnets Test Results and Final Design Issues

The SIS 100 synchrotron is based on Nuclotron type superconducting magnets. These are operated with 4 T/s up to a maximum field of 2 Tesla (dipoles). Based on the experience of the R&D period three full scale dipoles as well as one quadrupole were built. The first dipole was tested intensively this year. We present the operation performance of the first magnet next to the AC losses and apply a concise description of the magnetic field within the complete elliptical beam pipe. We analyse the static and dynamic field quality of the dipoles and compare them to the calculated ones. These test results allow us describing the parameters of the final dipole design for the machine and the field distortions the vacuum chamber creates along with investigations to reduce these artefacts. Based on our preliminary theoretical R&D and the recent measurement results we conclude on the expected operation parameters of an optimized curved dipole with a high current single layer coil and we describe the actual work topics for this magnet.

Status of the Development of Superconducting Magnets for the NICA Project

NICA is a new accelerator complex that is being under design and construction at JINR. The facility is aimed at providing collider experiments with heavy ions up to Uranium in a center of mass energy range from 4 to 11 GeV/u and an average luminosity up to 1027 cm-2 s-1. The collisions of polarized deuterons are also foreseen. The facility includes two injector chains, a new superconducting booster synchrotron, the existing 6 superconducting synchrotron-Nuclotron, and a new superconducting collider consisting of two rings, each of about 503 m in circumference. The booster synchrotron and the NICA collider are based on an iron-dominated “window frame”-type magnets with a hollow superconductor winding analogous to the Nuclotron magnet. The status of the development of the full size model magnets for the booster synchrotron as well as for the NICA collider is presented.

SIS100 Dipole Magnet Optimization and Local Toroidal Multipoles

SIS100 is the worlds second fast ramped synchrotron using superconducting magnets. The foreseen high current operation requires a sound understanding of the field homogeneity next to a field parametrization which allows investigating if the existing inhomogeneity introduces transverse oscillations on the particle beam. The SIS100 dipole magnets are curved so local toroidal multipoles were developed as these follow the orbit of the ion beam. The end of the magnet creates the main field deterioration due to the coil end shape which has to be compensated by a 3D end shim. In this paper we present the Local Toroidal Multipoles next to formulae to derive these from rotating coil probe measurements. Further we outline the possible geometrical options for meeting the field quality target.

Superconducting Magnets for the NICA Accelerator Collider Project

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 · 1027 cm-2s-1 for Au79+. 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.

Superferric rapidly cycling magnets optimized field design and measurement

FAIR will feature two superconducting fast ramped synchrotrons. The dipole magnets for one of them, SIS 100, have been designed and full size magnets were built. The properties of the magnetic field were analysed using OPERA (for DC operation) and ANSYS for dynamic calculations. Elliptic multipoles fulfilling the Laplace Equation in plane elliptic coordinates describe the field within the whole aperture consistently within a single expansion. Further circular multipoles, valid within the ellipse, can be calculated analytically from the elliptic multipoles. The advantage of this data representation is illustrated on the FEM calculation performed for SIS 100 dipoles and quadrupoles currently foreseen for the machine.