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Design, Fabrication, and Testing of the Aliss Superconducting Mine-Countermeasures Magnet

  • M. Heiberger
  • A. R. Langhorn
  • W. P. Creedon
  • S. Chapelle
  • R. A. Guzman
  • T. E. Harris
  • D. G. Morris
  • J. E. Medrano
  • J. Tannenbaum
  • M. E. Golda
  • T. H. Fikse
  • D. Waltman
  • G. F. Green
  • J. N. Chafe
  • J. D. Walters
  • C. Prenger
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

A conduction-cooled lightweight 7.5 MJ superconducting (SC) magnet capable of sustaining 100 g shock loads has been built and has undergone initial testing in support of the U.S. Navy’s mine warfare program1. The solenoid magnet coil uses Cu:NbTi (4:1) superconductor wire and operates at a steady state temperature of less than 5 K while being cooled by two Gifford McMahon rare earth cryocoolers. The cryocoolers are detachable via a cold sleeve. Oxygen and ethane heat pipes thermally link the coil to the cryocooler’s first stages to reduce cooldown time. The coil’s cold-to-warm support structure comprises a series of re-entrant cylinders made of fiberglass reinforced epoxy composite. The vacuum vessel and thermal shields are constructed from formed aluminum isogrid panels which maximize the strength-to-weight ratio. The magnet uses grain-aligned YBCO high-Tc current leads operating between 30 K and 4 K, and the maximum design current is 147 Amps. The magnet has demonstrated stable operation up to 6.7 K at 60% of rated current. Operation of the magnet and its ancillary systems along with monitoring of all critical performance parameters is accomplished via a laptop computer. Additional tests are planned during which the magnet and its control system will be readied for participation in a joint Army-Navy Advanced Technology Demonstrator program involving mine sweeping exercises in 1998. During these exercises, the SC magnet system will be mounted on a small Naval craft designed to demonstrate new shallow water mine countermeasures technologies at sea.

Keywords

Heat Pipe Magnetic Dipole Moment Vacuum Vessel Coil Temperature Coil Diameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Program supported by the DOD, Naval Surface Warfare Center, Carderock Division, Annapolis Detachment, contract N61533–95-C-0080 with General Atomics.Google Scholar
  2. 2.
    R.X. Maix, D. Salathe, “Practical Scaling Formulas for the Determination of the Critical Currents in NbTi Superconductors, “Proceedings at the 9th International Conf. on Magnet Technology, Zurich, Switzerland”, 1985Google Scholar
  3. 3.
    M. Heiberger, et al. “A Lightweight Rugged Conduction-Cooled NbTi Superconducting Magnet for U.SNavy Minesweeper Applications”, Advances in Cryogenic Engineering, Volume 41, Plenum Press, New York, 1996.Google Scholar
  4. 4.
    A.R. Langhorn, J.D. Walters, M. Heiberger, “Development and Testing of a Demountable Cryocooler Thermà Interface”, Proceedings from the 9th International Cryocooler Conf., Waterville Valley, New Hampshire, 1996.Google Scholar
  5. 5.
    C. Prenger, et al. “Heat Pipes for Enhanced Cooldown of Cryogenic Systems”, Proceedings from the 9th International Cryocooler Conference, Waterville Valley, New Hampshire, 1996.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • M. Heiberger
    • 1
  • A. R. Langhorn
    • 2
  • W. P. Creedon
    • 1
  • S. Chapelle
    • 1
  • R. A. Guzman
    • 1
  • T. E. Harris
    • 1
  • D. G. Morris
    • 1
  • J. E. Medrano
    • 1
  • J. Tannenbaum
    • 3
  • M. E. Golda
    • 3
  • T. H. Fikse
    • 3
  • D. Waltman
    • 3
  • G. F. Green
    • 3
  • J. N. Chafe
    • 3
  • J. D. Walters
    • 3
  • C. Prenger
    • 4
  1. 1.General AtomicsSan DiegoUSA
  2. 2.Startech IncSolana BeachUSA
  3. 3.Carderock Division, Annapolis Detachment (NSWCCD)Naval Surface Warfare CenterAnnapolisUSA
  4. 4.Los Alamos National LabLos AlamosUSA

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