Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-12T19:52:41.606Z Has data issue: false hasContentIssue false
  • English
  • Français

Microwave Absorption by Lossy Ceramic Materials*

Published online by Cambridge University Press:  25 February 2011

Isidoro E. Campisi ,
Lynda K. Summers ,
Keith E. Finger  and
Anne M. Johnson
Isidoro E. Campisi
Affiliation:
Continuous Electron Beam Accelerator Facility 12000 Jefferson Avenue Newport News, VA 23606
Lynda K. Summers
Affiliation:
Continuous Electron Beam Accelerator Facility 12000 Jefferson Avenue Newport News, VA 23606
Keith E. Finger
Affiliation:
Continuous Electron Beam Accelerator Facility 12000 Jefferson Avenue Newport News, VA 23606
Anne M. Johnson
Affiliation:
Continuous Electron Beam Accelerator Facility 12000 Jefferson Avenue Newport News, VA 23606
Get access

Abstract

Microwave energy generated by the electron beam in the superconducting cavities of the Continuous Electron Beam Accelerator Facility (CEBAF) is absorbed by special loads fabricated with a novel lossy ceramic material (AIN-glassy carbon) developed especially for this application. Strict environmental constraints (ultra-high vacuum compatibility, operation at 2 K, brazeability, etc.) are imposed on the materials which can be used. Several other ceramics were sintered with AIN and various minority conductive powders to obtain the desired electrical properties according to the ‘artificial dielectric’ model. Dielectric permittivity data and results of low temperature measurements are reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 157
Copyright
Copyright © Materials Research Society 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

This work was supported by the U.S. Department of Energy under contract DE-AC05-84ER40150

References

REFERENCES

1. Campisi, I. E., Finger, K. E., Summers, L. K., and Johnson, A. M., “Higher-Order-Mode Damping and Microwave Absorption at 2 K,” presented at the Third European Particle Accelerator Conference, Berlin, March 24-28, 1992.Google Scholar
2. Ziman, J. M., Electrons and Phonons (Oxford, 1960), Chap. 9.Google Scholar
3. Seitz, F., The Physics of Metals (McGraw-Hill, 1943), Chap. 21.Google Scholar
4. Newnham, R. E., Jang, S. J., Xu, Ming, and Jones, F., “Fundamental interaction mechanisms between microwaves and matter,” Ceramics Transactions 21, 51–67 (1991).Google Scholar
5. Kenkre, V. M., “Theory of microwave interactions with ceramic materials,” ibid., 69–80.Google Scholar
6. Takeda, Y., “Development of high-thermal-conductive SiC ceramics,” Ceramic Bull. 67 (12), 1961–1963 (1988).Google Scholar
7. Kharadly, M. M. Z. and Jackson, W., “The properties of artificial dielectrics comprising array of conducting elements,” Proc. Institute El. Eng. 9100, 199–212 (1953).Google Scholar
8. Collin, R. E., Field Theory of Guided Waves, 2nd ed. (New York, 1991), Chap. 12.Google Scholar
9. Doyle, W. T. and Jacobs, I. S., “Effective cluster model of dielectric enhancement in metal-insulator composites,” Phys. Rev. B 42, (15), 9319–9327 (1990).Google Scholar
10. Russell, N. E., Garland, J. C., and Tanner, D. B., “Absorption of far-infrared radiation by random metal particle composites,” Phys. Rev. B 23, 632–639 (1981).Google Scholar
11. Jacobs, I. S., “Advanced artificial dielectric materials for millimeter wavelength applications,” Report 90-SRD-001, GE CRD, Schenectady, 1990.Google Scholar
12. Kirkpatrick, S., “Percolation and conduction,” Rev. Mod. Phys. 45, (4) 574–588 (1973).CrossRefGoogle Scholar
13. Cheney, R. F., Daga, R. L., German, R. M., Bose, A., and Burlingame, J. W., “Heavy alloys from rapidly solidified powders,” Proceedings of the 1988 International Powder Metallurgy Conference and Exhibition, Orlando, Florida, June 1988.Google Scholar
14.Sintering done by Ceradyne, Inc., Costa Mesa, Ca.Google Scholar
15.Manufactured by SIGRI, Inc.Google Scholar
16. CRC Handbook of Chemistry and Physics, 62nd ed.Google Scholar
17. Guillot, T. and Bobillot, G., “Mesure en hyperfrequence de la conductivite' electrique d'un grain elementaire d'une poudre conductrice,” presented at SEE Conference, Limoges, 1991.Google Scholar
18. Handbook of Thermophysical Properties of Solid Materials, Vol. IV, (New York, 1961).Google Scholar