Superconducting Ring Cyclotron Research Articles

Mechanical design of sector magnets for the RIKEN superconducting ring cyclotron

A six-sector superconducting ring cyclotron (SRC) is being constructed as a primary post accelerator of the existing accelerator complex for the RI beam factory. Mechanical design of the main coil vessel of the SRC is described.

Design of structure and quench-stability of sector magnets for RIKEN superconducting ring cyclotron

Design, especially about the structure and quench stability, of the superconducting sector magnets for the RIKEN superconducting ring cyclotron is described. Special features of the sector magnets are the triangular shape superconducting coil, cold pole arrangement for supporting of the huge magnetic forces and the cryogenic stable coils. A full-scale superconducting model is now under construction as a prototype sector magnet.

Trim coil system design of a superconducting ring cyclotron

The trim coil system of a superconducting ring cyclotron currently under design at RIKEN is composed of five sets of superconducting and twenty sets of normal-conducting coils. A major correction for isochronization of the magnetic field is accomplished by the superconducting coils, and a fine correction by the normal-conducting coils. For an optimal design of the system, a numerical procedure was developed to generate isochronous fields for design nuclei and consequently current settings on the main and trim coils, employing an iteration of a least-squares fitting to minimize orbital frequency errors. The main and normal-conducting coils can also be used to correct unwanted harmonic fields with sector dependent and/or radially localized excitations. The correction schemes were conceived for presumed error fields, alignment tolerances being estimated based upon beam optics requirements. On the other hand, a new trim coil design was envisaged, which comprises only superconducting trim coils. The subcoils in the present five-set design can be independently excited to replace the normal-conducting coils. This option may be more economical, but complications on the superconducting coil system raise a reliability concern.

理研ＲＩビームファクトリー用超電導リングサイクロトロン

A cascade of two ring cyclotrons for the RIKEN RI beam factory are being constructed to provide primary heavy ions, up to uranium ions, with energies exceeding 100MeV/nucleon. The one in the second stage is a large-scale superconducting ring cyclotron with six sector magnets. The concept of the superconducting ring cyclotron design and status of the construction of its full-scale prototype are described. Compact superconducting cyclotrons now operating around the world are also introduced.

理研超電導リングサイクロトロン用セクター電磁石の開発 基本設計

Superconducting sector magnets are to be the main components of the superconducting ring cyclotron for the RIKEN RI beam factory. A full-scale prototype sector magnet is being developed and constructed. One of the critical points of the design is how to support the huge magnetic force exerted on the superconducting main coil. A cold-pole arrangement is adopted as the solution to this problem. Unbalanced magnetic forces were measured using 1/6-scaled-Cu/Fe magnets. A cryogenic stabilizing method is applied to make the main and trim coils quench-free. The whole structure, magnetic force and its support structure, quench protection, eddy current loss in the cold-pole, and helium cooling system are described.

理研超電導リングサイクロトロン用セクター電磁石の開発 超電導コイルとその冷却安定化

Superconducting sector magnets are to be the main components of the superconducting ring cyclotron for the RIKEN RI beam factory. The sector magnet has superconducting main and trim coils. A cryogenic stabilization method is applied to both coils in order to make them quench-free. Both superconducting coils and their wires, design of stabilization, quench simulation, and measurement of the stabilized currents using small test coils are described.

RIKEN RI-Beam Factory project

The RIKEN Accelerator Research Facility has proposed the `RI-Beam Factory' project. In the 1997 fiscal year, the construction budget for the first phase of this project has been formally approved. The factory is aimed at providing the world's most intense radio-isotope beams at energies of several hundred MeV/nucleon over the whole range of atomic masses. For that purpose, a cascade of a ring cyclotron and a superconducting ring cyclotron will boost the energy of heavy-ion beams from the existing ring cyclotron up to 400 MeV/nucleon for light ions and more than 100 MeV/nucleon for very heavy ions. Multi-use experimental storage rings (MUSES) consisting of an accumulator-cooler ring, a booster synchrotron ring and double storage rings will also be used as a new generation of experimental installation. The MUSES will enable us to conduct various types of unique colliding experiments.

RIKEN RI beam facility and its physics programme

A construction of the radioactive ion beam facility has been started at RIKEN, which is a project to construct a four-sector ring cyclotron (IRC-4) and a six-sector superconducting ring cyclotron (SRC-6), experimental storage rings (MUSES) and an experimental facility. Heavy ions are to be accelerated to energies of up to for light nuclei and for the heaviest nuclei by the SRC-6 and up to in the MUSES. Wide varieties of radioactive nuclear beams are to be supplied as secondary beams. Electrons, stable nuclei, and highly charged ions in addition to radioactive nuclei can be stored in the storage rings. The MUSES provides various collision methods, such as colliding, merging and internal target modes. A few of the new nuclear-physics opportunities are discussed briefly.

RI beam factory project

The RI Beam Factory is being proposed at RIKEN, which is a project to construct a set of equipment which includes a superconducting ring cyclotron (SRC) and experimental storage rings (MUSES). Heavy ions are to be accelerated to energies of up to 400 A MeV for light nuclei and 150 A MeV for the heaviest nuclei by the SRC and up to 1400 A MeV in the MUSES. Radioactive nuclear beams are to be supplied as secondary beams. Electrons, stable nuclei, and highly charged ions in addition to radioactive nuclei can be stored in the storage rings. The MUSES provide various collision methods, such as colliding, merging, and internal target modes. A few of the new nuclear physics opportunities are discussed.

Ri beam factory project

Abstract The RI Beam Factory is being proposed at RIKEN, which is a project to construct a set of equipment which includes a superconducting ring cyclotron (SRC) and experimental storage rings (MUSES). Heavy ions are to be accelerated to energies of up to 400 A MeV for light nuclei and 150 A MeV for the heaviest nuclei by the SRC and up to 1400 A MeV in the MUSES. Radioactive nuclear beams are to be supplied as secondary beams. Electrons, stable nuclei, and highly charged ions in addition to radioactive nuclei can be stored in the storage rings. The MUSES provide various collision methods, such as colliding, merging, and internal target modes. A few of the new nuclear physics opportunities are discussed.

Magnet Sector Design for a 15-GeV Superconducting Cyclotron

Pole shape designs are presented which maintain focused and isochronous orbits in the two stages of a superconducting ring cyclotron kaon factory (CANUCK). The first stage of 15 sectors takes a 100 μA proton beam extracted from TRIUMF to 3.5 GeV. The second stage of 42 sectors continues the acceleration to 15 GeV. The orbit properties have been determined using a median plane magnetic field computed from the current distribution in the coils and in current sheets simulating the saturated steel. The design process and the effects of various factors, including softness of the edges, cross-section of the coils and negative field gullies, will be described.