Abstract
The cavity, constructed of Cu with a surface deposit of the superconductor being tested, was fastened directly to the bottom of a liquid He reservoir. It was about 14 cm in diameter, 14 cm in length, and was resonant at 2856 Mc in the TE/sub 011/ mode. An important feature was a variable coupling mechanism consisting of a ciosed wire loop suspended by a moveable dielectric arm, which extends into the cavity through a small hole in the cavity end plate. The Q of the cavity was measured by the decrement method. Measurements were made on an unpolished electroplated lead surface and on several types of tin surfaces. A curve shows variation of cavity Q with temperature. A table shows values of surface resistivity obtained. (A.G.W.)
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