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An instrument for low- and variable-temperature millimeter-wave surface impedance measurements under magnetic fields

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4 Author(s)
Hanaguri, Tetsuo ; Department of Advanced Materials Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033SORST, Japan Science and Technology Corporation, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan ; Takaki, Keishi ; Tsuchiya, Y. ; Maeda, Atsutaka

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We describe a low-temperature millimeter-wave (44 GHz) surface impedance measurement instrument based on the cavity perturbation method. In this instrument, all millimeter-wave paths at low temperatures (including the cavity resonator), are located inside a high vacuum tube, which can be inserted into a 7 T superconducting magnet. This design, which is free of exchange gas, enables measurements over a wide temperature range as well as providing stable and reproducible operation. By pumping a 3He pot attached to a cavity, a sample can be cooled well below 1 K. We present experimental results which demonstrate the performance of the instrument. © 2003 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:74 ,  Issue: 10 )