Summary/conclusions
Rieke diagrams provide a useful way of estimating the effect of reflections from the window on gyrotron performance. In some cases, a small change in the reflection coefficient can have a large effect on the output power and on the resonator wall losses. Rieke diagrams can also be useful in determining whether or not a mode will oscillate at all for a given set of parameters and reflection coefficieat.
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References
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Borie, E., Jödicke, B. Rieke diagrams for gyrotrons. Int J Infrared Milli Waves 11, 243–250 (1990). https://doi.org/10.1007/BF01010518
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DOI: https://doi.org/10.1007/BF01010518