A New Method for Measuring the Low-Temperature Dielectric Property of a Low-Loss Material with a Superconducting Resonant Cavity

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概要

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• A superconducting 6.5 GHz cylindrical TE011 mode cavity was used to measure the small dielectric loss of polytetrafluoroethylene at liquid helium temperature. First, the Q value and the resonance frequency of the unperturbed niobium cavity was measureJ by the decrement method. Then a thin cylindrical rod sample, suspended from the magnetic loop, was inserted into it through the coupling port. By the use of a gate valve and a vacuum. by-pass the sample can be drawn out and reassembled without introducing air into the cavity. From the decrease of the Q value and the shift of the resonance frequency, the complex dielectric constant was obtained (ε'/ε_0=1.9 and ε"/ε_0=4.4×10^<-6> at 1.3 K). Loss tangent tan δ was estimated as 2.4×10^<-6>.

• 社団法人応用物理学会の論文
• 1976-11-05

著者

• Isagawa Shigeru

  Department Of Physics Faculty Of Science University Of Tokyo:(present Address) National Laboratory F

関連論文

• A New Method for Measuring the Low-Temperature Dielectric Property of a Low-Loss Material with a Superconducting Resonant Cavity

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