MEASUREMENT OF MICROWAVE PARAMETERS OF A SUPERCONDUCTING NIOBIUM CAVITY

This paper describes a method for direct measurement of the amplitude–frequency characteristics and the Q factor of empty superconducting niobium radio frequency Tesla-type cavities. An automated measuring complex that permits recording the superconductivity effect and measuring high Q values has been developed. Measurements have been made of the Q factors of the investigated objects (the fi rst domestic 1.3-GHz niobium cavities) at a level no lower than 0.1·10⁹ (with a maximum value of ~1.2·10¹⁰) and a level of relative losses lower than ~130 dB (with a minimum factor of ~139.7 dB) at liquid nitrogen temperature.
This paper describes a method for direct measurement of the amplitude–frequency characteristics and the Q factor of empty superconducting niobium radio frequency Tesla-type cavities. An automated measuring complex that permits recording the superconductivity effect and measuring high Q values has been developed. Measurements have been made of the Q factors of the investigated objects (the fi rst domestic 1.3-GHz niobium cavities) at a level no lower than 0.1·10⁹ (with a maximum value of ~1.2·10¹⁰) and a level of relative losses lower than ~130 dB (with a minimum factor of ~139.7 dB) at liquid nitrogen temperature.
Author:  N. S. Azaryan, M. A. Baturitskii, Yu. A. Budagov, D. L. Demin, S. E. Dem′yanov, V. A. Karpovich, V. V. Kniga, R. M. Krivosheev, N. V. Lyubetskii, S. I. Maksimov, I. L. Pobol′, V. N. Rodionova, G. D. Shirkov, N. M. Shumeiko, and S. V. Yurevich
Keywords:  steam–molybdenum reaction, metallographic analysis, evaporation, repeated flooding, shut-down cooling
Page:  242