Measurement system for GHz current waveform based on high-Tc superconductor sampler

摘要

A High-Tc superconductor sampler is a device which can measure current waveform with pico-second and micro-ampere resolutions. We are developing a current measurement system which is based on the sampler cooled by a pulse-tube cryo-cooler. The target of the system is measurement of high-frequency current waveform up to 20 GHz flowing through a room temperature sample without contact. Sine wave currents flowing through a micro-strip line have been successfully measured up to 20 GHz with correct periods.