Superconducting magnets for the RAON electron cyclotron resonance ion source

Abstract

The RAON linear accelerator of Rare Isotope Science Project has been developed since 2011, and the superconducting magnet for ECRIS was designed. The RAON ECR ion source was considered as a 3rd generation source. The fully superconducting magnet has been designed for operating using 28 GHz radio frequency. The RAON ECRIS operates in a minimum B field configuration which means that a magnetic sextupole field for radial confinement is superimposed with a magnetic mirror field for axial confinement. The highest field strength reaches 3.5 T on axis and 2 T at the plasma chamber wall for operating frequency up to 28 GHz. In this paper, the design results are presented of optimized superconducting magnet consisting of four solenoids and sextupole. The prototype magnet for ECRIS was fabricated and tested to verify the feasibility of the design. On the basis of test results, a fully superconducting magnet will be fabricated and tested.

Achromatic and isochronous lattice design of P2DT bending section in RAON accelerator

“…Firstly the IF system takes a diver linac which consists of the 28 GHz superconducting electron cyclotron resonance ion source (ECR-IS) [3], the main low energy beam transport (LEBT) section, the 500 keV/u RFQ (radio-frequency quadrupole) accelerator, the medium energy beam transport (MEBT) section [4], the 18.5 MeV/u low energy superconducting linac (SCL1), the charge stripper section (CSS), and the high energy superconducting linac (SCL2). Unlike this IF system, the ISOL system investigated in this paper uses 70 MeV cyclotron as a driver to deliver 70 kW beam power to the target.…”

A study on the design of hexapole in an 18-GHz ECR ion source for heavy ion accelerators

“…Therefore the Lorentz force should be reduced. The Lorentz force F in the hexapole coils can be calculated by [5] dv B J F   d (2) where B is the magnetic flux density and J is a differential current element.…”

“…In the minimum B configuration, the magnetic field from a hexapole is used for radial confinement [2]. Hexapoles could have several design structures.…”

Electromagnetic characteristics of a superconducting magnet for the 28 GHz ECR ion source according to the series resistance of the protection circuit

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A linear accelerator, called RAON, has been being developed as a part of Rare Isotope Science Project (RISP) by Institute for Basic Science (IBS) [1]. The linear accelerator utilizes an electron cyclotron resonance (ECR) ion source for providing intense highly charged ion beams to the linear accelerator.

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