Abstract
A system with a high sensitivity is developed to measure an ac magnetization curve of superconducting wires for ac uses. A design method of this system is discussed and main points to increase the sensitivity are made clear. As a result, the equation to estimate the error of the designed system is provided and therefore the dependence of some design parameters on the error can be calculated. A system is manufactured as an experiment, and its functions are made certain that the sensitivity is very high as designed. Data of the ac magnetization curve of the superconducting ac wire can be obtained successfully by using this system.
