Superconducting Magnets/Rare Isotope Accelerators

Paper Title Page
MPPT031 Radiation Resistant Magnets for the RIA Fragment Separator 2200
  • A. Zeller, V. Blideanu, R.M. Ronningen, B. Sherrill
    NSCL, East Lansing, Michigan
  • R.C. Gupta
    BNL, Upton, Long Island, New York
  Funding: Supported in part by Michigan State University and the U.S. DOE.

The high radiation fields around the production target and the beam dump in the fragment separator at the Rare Isotope Accelerator requires that radiation resistant magnets be used. Because large apertures and high gradients are required for the quadrupoles and similar demanding requirements for the dipole and sextupoles, resistive coils are difficult to justify. The radiation heating of any materials at liquid helium temperatures also requires that superconducting versions of the magnets have low cold-masses. The final optical design has taken the practical magnets limits into account and sizes and fields adjusted to what is believed to be achievable with technology that is possible with sufficient R&D. Designs with higher obtainable current densities and having good radiation tolerances that use superconducting coils are presented, as well as the radiation transport calculations that drive the material parameters.

MPPT048 Test Results of HTS Coil and Magnet R&D for RIA 3016
  • R.C. Gupta, M. Anerella, M. Harrison, W. Sampson, J. Schmalzle
    BNL, Upton, Long Island, New York
  • A. Zeller
    NSCL, East Lansing, Michigan
  Funding: Work supported by the U.S. Department of Energy and by the National Science Foundation.

Brookhaven National Laboratory is developing quadrupole magnets for the proposed Rare Isotope Accelerator (RIA) based on commercially available High Temperature Superconductors (HTS). These quadrupoles will be used in the Fragment Separator region and are one of the more challenging elements in the RIA proposal. They will be subjected to several orders of magnitude more energy and radiation deposition than typical beam line and accelerator magnets receive during their entire lifetime. The proposed quadrupoles will operate in the 20-40 K temperature range for efficient heat removal. HTS coils that have been tested so far indicate that the coils meet the magnetic field requirements of the design. We will report the test results of about 10 HTS coils and of a magnetic mirror configuration that simulates the magnetic field and Lorentz force in the proposed quadrupole. In addition, the preliminary design of an HTS dipole magnet for the Fragment Separator region will also be presented.