Materials and machining processes for 140 GHz gyrotron resonators

T. Geist

doi:10.1117/12.2301492

1 December 1990 Materials and machining processes for 140 GHz gyrotron resonators

T. Geist

Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 15142A (1990) https://doi.org/10.1117/12.2301492
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States

Abstract

Excess heating of the high power gyrotron resonator due to ohmic losses may cause irreversible changes of the resonator geometry. Thus the oscillating frequency is shifted and multimoding may be difficult to be prevented. The following questions have been examined in order to support the construction of a TE₀₃ gyrotron resonator at 140 GHz: Do harder copper alloys have any advantages? How do wall losses depend on the manufacturing process? The paper presents the measured surface resistances of oxigene free copper and different copper alloys. These materials have been machined with different processes. The surface resistance is determined by measuring the Q-factor of a cylindrical cavity at 143 GHz.

Citation Download Citation

T. Geist "Materials and machining processes for 140 GHz gyrotron resonators", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15142A (1 December 1990); https://doi.org/10.1117/12.2301492

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