Impact of The High-Energy Product Materials on Magnetic Circuit Design

Abstract

Many devices that employ magnetic fields are encumbered by massive solenoids with their equally bulky power supplies or by inefficient permanent-magnet structures designed for use with obsolescent magnet materials. This paper describes how the high-energy product materials are employed in several structures to afford mass and bulk reductions of an order of magnitude or more. Also discussed are novel designs that are not attainable with the older materials such as the alnicos. Substitution of solenoids with permanent magnets also eliminates considerable energy consumption and the attendant problems arising from generation of heat. In many cases, all this is accomplished within leakage-free systems. Among the designs described are: nuclear magnetic resonance imagers; cylindrical solenoidal field structures for klystrons and nonperiodic field TWT’s; cylindrical field structures with arbitrary axial gradients for advanced gyrating beam sources; annular field sources for high harmonic gyrotrons; helical transverse field sources for circularly polarized radiation sources; miniature periodic permanent-magnet configurations; and clad permanent-magnet circuits for biasing fields in millimeter-wave filters. Where alternate designs exist, they are compared with regard to performance, bulk, and economy. All of the structures are in various stages of design and construction, and, for completed structures, comparisons are made between theoretical projections and actual performance.

This is a preview of subscription content, access via your institution.

References

  1. 1

    H. C. Roters, Electromagnetic Devices, Chapters 4 & 5, (Wiley, New York, (1941).

    Google Scholar 

  2. 2

    R. J. Parker and R. J. Studders, Permanent Magnets and Their Application, Chapters 4 & 5, (Wiley, New York, London, 1962).

  3. 3

    H. A. Leupold, in Proceedings of the Fifth International Workshop on Rare-Earth-Cobalt Permanent Magnets and Their Applications, Roanoke, VA, June 7–10 1981, p. 270.

  4. 4

    H. A. Leupold, “A Magnetic Design Primer,” Part V, summer short course, Modern Permanent Magnets, Applications and Design, May 19–23, 1986, p. 140.

  5. 5

    W. Neugebauer and E. M. Branch, “Applications of Cobalt Samarium Magnets to Microwave Tubes,” Technical Report, Microwave Tube Operation, General Electric (15 March 1972).

  6. 6

    F. Rothwarf, H. A. Leupold and L. J. Jasper, Jr., Proc. of the Third International Workshop on Rare-Earth Magnets and Their Applications, p. 255, Ed. K. J. Strnat (1978).

  7. 7

    A. Tauber, H. A. Leupold and F. Rothwarf, Proc. of the Eighth International Workshop on Rare Earth Magnets and Their Applications, p. 103, Ed. K. J. Strnat (1985).

  8. 8

    J. P. Clarke and H. A. Leupold, IEEE Transactions on Magnetics, MAG 22, No. 5, p. 1063 (1986).

    Article  Google Scholar 

  9. 9

    E. Potenziani II and H. A. Leupold, IEEE Transactions on Magnetics, MAG 22, No. 5, p. 1078 (1986).

    Article  Google Scholar 

  10. 10

    D. S. Furuno, D. B. McDermott, and N. C. Luhmann, Jr., Proceedings of IEDM, p. 346, Los Angeles, CA, December 7–10 1986.

  11. 11

    D. B. McDermott, N. C. Luhmann, Jr., D. S. Furuno, A. Kupiszewski, and H. R. Jory, Int. J. I. R. and Millimeter Waves 4, 639 (1983).

    Article  Google Scholar 

  12. 12

    N. J. Dionne, Proceedings of IEDM, p. 513, Los Angeles, CA, Dec. 7–10, (1986).

  13. 13

    J. P. Clarke, E. Potenziani II, and H. A. Leupold, 31st Annual Conference on Magnetism and Magnetic Materials, Paper BP-17, Baltimore, MD, Nov. 17–20 (1986). (To be published in J. A. P.)

  14. 14

    J. H. Battacletti and T. A. Knox, IEEE Trans. Magn., MAG 21 (5), 1874 (1985).

    Article  Google Scholar 

  15. 15

    H. A. Leupold, J. P. Clarke, W. E. Lockwood, and D. J. Meyers, Proceedings of IEDM, p. 693, Los Angeles, CA, Dec. 7–10 (1986).

  16. 16

    H. A. Leupold and J. P. Clarke, submitted for publication in Electron Devices Society Transactions; Part II, Vacuum Electron Devices.

  17. 17

    Klaus Halbach, Proceedings of the Eighth International Workshop on Rare-Earth Magnets and their Applications, p. 128, Dayton, OH, May 1985.

  18. 18

    A. B. C. Morcos, University of Dayton, School of Engineering, M.S. Thesis, November, 1985.

  19. 19

    H. A. Leupold and E. Potenziani II, Intermag Paper GH–12, Tokyo, Japan, April 14–17, 1987.

  20. 20

    H. A. Leupold and E. Potenziani, IEEE Trans., Magnetics, (to appear September, 1987).

  21. 21

    R. M. Phillips, IRE ED-7, p. 231 (1960).

  22. 22

    R. H. Jackson and D. E. Pershing, Proceedings of IEDM, p. 86, Los Angeles, CA, Dec. 7–10, 1986.

  23. 23

    A. B. C. Morcos, E. Potenziani II, and H. A. Leupold, IEEE Transactions on Magnetics, MAG 22, No. 5, p. 1066, 1986.

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Herbert A. Leupold.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Leupold, H.A., Potenziani, E., Clarke, J.P. et al. Impact of The High-Energy Product Materials on Magnetic Circuit Design. MRS Online Proceedings Library 96, 279 (1987). https://doi.org/10.1557/PROC-96-279

Download citation