title: Note: Radio frequency surface impedance characterization system for superconducting samples at 7.5 GHz.
abstract: A radio frequency (RF) surface impedance characterization (SIC) system that uses a novel sapphire-loaded niobium cavity operating at 7.5 GHz has been developed as a tool to measure the RF surface impedance of flat superconducting material samples. The SIC system can presently make direct calorimetric RF surface impedance measurements on the central 0.8 cm(2) area of 5 cm diameter disk samples from 2 to 20 K exposed to RF magnetic fields up to 14 mT. To illustrate system utility, we present first measurement results for a bulk niobium sample.
authors.affiliation: Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
authors.forename: B P
authors.initials: BP
authors.lastname: Xiao
authors.forename: C E
authors.initials: CE
authors.lastname: Reece
authors.forename: H L
authors.initials: HL
authors.lastname: Phillips
authors.forename: R L
authors.initials: RL
authors.lastname: Geng
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: F
authors.initials: F
authors.lastname: Marhauser
authors.forename: M J
authors.initials: MJ
authors.lastname: Kelley