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Epoxy Impregnated Solenoid Coil Training Dependence on Boundary Forces and Peak Field

  • T. A. Antaya
  • A. F. Zeller
  • J. DeKamp
  • K. A. Harrison
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 35)

Abstract

Five solenoid coils are required for the axial component of a Minimum B magnetic field of a confined plasma ion source under construction at NSCL. The design requires an inside radius of 0.15 m and a coil current density of 12 kA/cm2 at a Bmax of 3.5 T. The initial fabrication scheme was envisaged to be wet wound coils in pockets on the outside of a stainless steel bobbin, (the inner surface being reserved for a six coil superconducting hexapole magnet that completes the magnetic structure). Finite element analysis indicated the possibility of large internal and boundary stresses on the epoxy/coil composite, and we have completed several empirical studies of this geometry. We have measured bobbin to epoxy bond strengths, and have found that the best, most consistent results are obtained by acid etching the stainless steel for good epoxy adhesion. A test arrangement of three coils with differing boundary conditions (potted in pocket, potted in lineal pocket and a free coil) reached, respectively, 40, 48 and 58 kA/cm2 after training. Finite element analysis indicate the probable failure mode of the fixed coil to be boundary stress and for the free coils, internal shear is the indicated failure mode.

Keywords

Maximum Shear Stress Maximum Principal Stress Electron Cyclotron Resonance Solenoid Coil Circular Coil 
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.
    T. A. Antaya, The Advanced Superconducting ECR Project at NSCL, in: “Intl. Conf. on ECR Ion Sources and their Appli.” East Lansing, Michigan, USA (1987) p. 312.Google Scholar
  2. 2.
    A. F. Zeller, et al, Construction and Testing of a Low Current Beamline Quadrupole, in: “Proc. Ninth Intl. Conf. on Magnet Tech.” Zurich, Switzerland (1985) p. 160.Google Scholar
  3. 3.
    J. C. DeKamp, et al, Construction and Testing of a ± 16u Superconducting Beamline Magnet, IEEE Trans, on Mag Mag-23:524 (1986). CrossRefGoogle Scholar
  4. 4.
    T. A. Antaya, et al, Magnetic Structure for a Superconducting Variable Frequency Electron Cyclotron Resonance Ion Source, IEEE Trans. Mag 25:1671 (1989).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • T. A. Antaya
    • 1
  • A. F. Zeller
    • 1
  • J. DeKamp
    • 1
  • K. A. Harrison
    • 1
  1. 1.National Superconducting Cyclotron LaboratoryMichigan State UniversityMichiganUSA

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