The Facility for Rare Isotope Beams under construction at Michigan State University, a new national user facility funded by the U.S. Department of Energy Office of Science will provide exotic rare isotope beams at energies of at least 200 MeV/u at a beam power of 400 kW. After the production target in the hot cell of the FRIB fragment separator there are seven quadrupole singlets that operate in a high-radiation environment. The designs of these large bore (up to 0.6 m), superferric quadrupoles with gradients as high as 13.3 T/m and effective lengths of 650 and 800 mm are presented. The current design is “warm iron” magnets with nominal yoke lengths of 650 and 730 mm and pole radii of 200 and 300 mm. The coil design is based on wet wound epoxy impregnated radiation tolerant Polyimide insulated conductor that provides ample current and temperature margins. This paper presents the detailed magnet design including coil forces, coil restraint system, coil properties, conductor stability, quench analysis and full mechanical details.

Superferric Cold Iron Quadrupole Magnets for FRIB Fragment Separator

The Facility for Rare Isotope Beams (FRIB) Project has entered the phase of beam commissioning starting from the room-temperature front end and the superconducting linac segment of first 15 cryomod...

/pdf/advances-of-the-frib-project-3t9i0yyvrx.pdf

Advances of the FRIB project

One of the challenges in the Facility for Rare Isotope Beams at Michigan State University is the 30 degree bending dipoles in the fragment separator operating in a high radiation environment. It is known that high temperature superconductors (HTS) have a much larger thermal margin due to high critical temperature > 90 K and high upper critical field > 100 T, which allows HTS magnets to operate stably so as to tolerate very high heat loads due to radiation. The HTS dipole magnets will utilize ReBCO conductor technology and operate at 38 K cooled by helium gas. High radiation deposits a large amount of heat into the iron yoke, cryostat, bobbin and HTS coil itself. For certain beams, over-bent particles will hit the cryostat with high intensity in the beam down-stream. Another difficulty is that the dipole coils generate significant Lorentz forces that need to be contained. All of these challenges have been analyzed separately and then integrated to find novel approaches. These approaches have been applied to optimize the magnet structure and enhance the 38 K helium gas cooling system. We present project status and progress of this HTS ReBCO dipole magnets and lay out a plan for magnet manufacturing.

Design and Engineering of an HTS Dipole in the FRIB Fragment Separator

The acceleration chain of the ISAC facility boosts the energy of both radioactive and stable light and heavy ions for beam delivery to both a medium energy area in ISAC-I and a high energy area in ISAC-II. The post-accelerator comprises a 35.4 MHz RFQ to accelerate beams of A/q ≤ 30 from 2 keV/u to 150 keV/u and a post stripper, 106.1 MHz variable energy drift tube linac (DTL) to accelerate ions of A/q ≤ 6 to a final energy between 0.15 MeV/u to 1.5 MeV/u. A 40 MV superconducting linac further accelerates beam from 1.5 MeV/u to energies above the Coulomb barrier. All linacs operate cw to preserve beam intensity.

The ISAC post-accelerator

Modern heavy ion accelerators require intense heavy ion beams with high charge state. Electron cyclotron resonance (ECR) sources are the primary tool for generating such beams, making them indispensable devices for heavy ion physics research. Remarkable performance advancements were obtained during the last decades. At present, state of the art “third generation” ECR ion sources are based on magnets built with NbTi conductor. However, future nuclear physics facilities will require significant improvement in beam intensity and quality, which can only be met by ECR sources operating at higher frequency and field. These fourth generation machines will need to incorporate a sophisticated sextupole magnet built with high performance Nb3Sn or NbTi conductor. In this paper, we review the technical challenges and worldwide progress in developing high performance superconducting ECR ion sources, and discuss the development of both third and fourth generation ECR ion source magnets at IMP.

Superconducting Magnets for High Performance ECR Ion Sources

The Facility for Rare Isotope Beams (FRIB) at MSU includes a driver linac that can accelerate all stable isotopes to energies beyond 200 MeV/u at beam powers up to 400 kW. The linac consists of 330 superconducting quarter- and half-wave resonators operating at 2 K temperature. Physical challenges include acceleration of multiple charge states of beams to meet beam-on-target requirements, efficient production and acceleration of intense heavy-ion beams from low to intermediate energies, accommodation of multiple charge stripping scenarios (liquid lithium, helium gas, and carbon foil) and ion species, designs for both baseline in-flight fragmentation and ISOL upgrade options, and design considerations of machine availability, tunability, reliability, maintainability, and upgradability. We report on the FRIB accelerator design and developments with emphasis on technical challenges and progress.

http://inspirehep.net/record/1364104/files/tu1a04.pdf

Frib accelerator status and challenges

The Facility for Rare Isotope Beams, a new national user facility funded by the U.S. Department of Energy Office of Science to be constructed and operated by MSU, is currently being designed to provide intense beams of rare isotopes to better understand the nuclear physics, nuclear astrophysics, fundamental interactions, and industrial and medical applications. The FRIB driver linac can accelerate all stable isotopes to energies beyond 200 MeV/u at beam powers up to 400 kW. Key technical R&D programs include low- CW SRF cryomodules and highly efficient charge stripping using a liquid lithium film. Accelerator-physics challenges include acceleration of multiple charge states of beams to meet beam-on-target requirements, efficient production and acceleration of intense heavy-ion beams from low energies, accommodation of multiple charge stripping scenarios and ion species, designs for both baseline in-flight fragmentation and ISOL upgrade options, and design considerations of machine availability, tunability, reliability, maintainability, and upgradability.

The frib project - accelerator challenges and progress*

The Facility for Rare Isotope Beams (FRIB) will be a world-leading, DOE Office of Science national user facility for the study of nuclear structure, reactions, and astrophysics on the campus of Michigan State University (MSU). A superconducting, heavy-ion, driver linac will be used to provide stable beams of >200 MeV/u at beam powers up to 400 kW (~650 electrical micro-amps for uranium). The stable beams will be used to produce rare isotopes by in flight fragment separation. After fragment selection, the rare isotopes will be used at velocity (~0.5c), stopped, or reaccelerated. An overview of the project, project challenges, and mitigating strategies is presented.

Technical challenges in design and construction of frib

FRIB Accelerator Beam Dynamics Design and Challenges

Facility for Rare Isotope Beams is a high-power heavy ion accelerator facility now under construction at Michigan State University. An overall commissioning plan for its driver linac is established with emphasis on safety, which is presented in this paper together with hazard mitigation and machine protection assumed during commissioning.

Commissioning plan for the frib driver linac

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