Nb Cavity

Assembled view of a three piece Nb cavity superconducting resonator. When the cavity is immersed in liquid helium it is a cylindrical electromagnetic resonator with a quality factor of greater than 20 million. Also shown is an exploded view of a Cu cavity, showing the three piece construction. The sample is placed in the center of the cavity, supported on a sapphire rod which enters through the small centered hole in the bottom Cu piece. The temperature of the sample is then independently controlled from that of the resonator walls, and can reach from 2 K to 300K. This cavity is based on a design by Kennedy and Sridhar.

For an example of data collected with this instrument see J. David Kokales, et al., Phys. Rev. Lett. 85, 3696-3699 (2000).

We wish to acknowledge the NSF Division of Materials Research for supporting this research under NSF MRSEC DMR 9632521 and the NSF Division of Electrical and Communication Systems for supporting this research under NSF ECS 9632811. We also acknowledge support from the Maryland MIPS program and the DARPA TASS program.

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