Title :
DC-Current Control Using SQUID-Gradiometer Systems
Abstract :
A dc-current control using a commercial-type of RF superconducting quantum interference device (SQUID) system has been developed for high-resolution nuclear magnetic resonance (NMR) experiments. The control unit is a superposed regulator designed to increase the stability of ordinary current sources with resistive feedback loops. Thus currents in the range 0.1 A to 1 A have been stabilized to better than 0.01 ppm/h.
Keywords :
Circuits; Coils; Control systems; Nuclear magnetic resonance; Resistors; SQUIDs; Stability; Superconducting devices; Superconducting magnets; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1980.4314944
