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Electromagnetic Analysis and Cold Test of a Distributed Window for a High Power Gyrotron

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Abstract

A novel distributed window for output radiation from a high power 110 GHz gyrotron is made of thin slats of sapphire interleaved and brazed to hollow metal vanes. We report the results of electromagnetic theory and cold test of this distributed window. We calculate the frequency dependence of the reflectivity of a Gaussian beam from the window. The theory indicates a significant frequency shift of the minimum reflectivity with temperature rise of the sapphire slab. This effect is of great importance for high power operation. In cold test, the distributed window reflectivity was measured while the window was heated. The cold test results are in good agreement with the theory.

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Authors and Affiliations

  1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139

    M. A. Shapiro & R. J. Temkin

  2. General Atomics, P.O. Box 85608, San Diego, California, 92186

    C. P. Moeller

Authors
  1. M. A. Shapiro
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  2. C. P. Moeller
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  3. R. J. Temkin
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Shapiro, M.A., Moeller, C.P. & Temkin, R.J. Electromagnetic Analysis and Cold Test of a Distributed Window for a High Power Gyrotron. International Journal of Infrared and Millimeter Waves 20, 533–542 (1999). https://doi.org/10.1023/A:1022676102770

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  • DOI: https://doi.org/10.1023/A:1022676102770

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