Technical drawing of the quadrupole resonator with attached sample and thermometry chamber housing a dc heater and temperature sensors.2
Surface resistance of a reactor grade bulk niobium sample for three frequencies as a function of temperature, measured at a magnetic field of about 15 mT. The solid lines show least squares fits to BCS theory. In the normal conducting regime above T c the surface resistance was also derived from 3 dB bandwidth measurements.
Quench field B max, RF of the bulk niobium sample in clean and dirty condition, measured in CW.
Critical field under RF (short pulses) of the clean bulk niobium sample.
Critical field under RF (short pulses) of the niobium film sample.
Material parameters derived from low field surface resistance measurements below 4.5 K.
Critical RF field of the bulk niobium sample.
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