Candace Goodson is assembling a superconducting sapphire microwave resonator for her research on the effects that carrier doping has on the superconducting thin films. She uses the resonator to determine the critical temperature of the superconductor and to look at how the surface resistance of the superconductor depends nonlinearly on current. Both of these properties are influenced by doping. Candace has developed a procedure to control the doping using a gas flow tube furnace.