60 GHz, 200 kW CW gyrotron with high output mode purity
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Description
For the first time, a Varian 60 GHz gyrotron, designed specifically to generate microwaves in a single output mode, has been operated at power levels up to 200 kW CW. High output mode purity is required for the efficient utilization of gyrotrons as high power microwave sources for electron cyclotron resonance heating (ECRH) in magnetic fusion plasmas. Using mode-specific directional couplers, measurements of the output mode content indicated that greater than 95% of the microwave output was in the desired TE/sub 02/ mode, with only small percentages in the neighboring TE/sub 01/ and TE/sub 03/ circular electric modes. The pure …
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Description
For the first time, a Varian 60 GHz gyrotron, designed specifically to generate microwaves in a single output mode, has been operated at power levels up to 200 kW CW. High output mode purity is required for the efficient utilization of gyrotrons as high power microwave sources for electron cyclotron resonance heating (ECRH) in magnetic fusion plasmas. Using mode-specific directional couplers, measurements of the output mode content indicated that greater than 95% of the microwave output was in the desired TE/sub 02/ mode, with only small percentages in the neighboring TE/sub 01/ and TE/sub 03/ circular electric modes. The pure mode CW design uses a 2.5-inch diameter collector. The collector has a magnetic field arrangement which capably avoids excessive heating by distributing the 640 kW CW beam over a sufficient collector area. With pure mode operation, window temperatures are 10/sup 0/C to 15/sup 0/C higher than with mixed mode operation.
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Jory, H.; Felch, K.; Bier, R.; Fox, L.; Huey, H.; Ives, L. et al.60 GHz, 200 kW CW gyrotron with high output mode purity,
article,
January 1, 1984;
United States.
(https://digital.library.unt.edu/ark:/67531/metadc1112050/:
accessed May 30, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
