The detailed knowledge of the voltage-current characteristicsU(I) of a superconductor and therefore its critical currentICandn-value is a prerequisite for the application of these materials. In the past, we focussed on the high resolutionU(I)-determination under quasi steady-state conditions in order to avoid transient voltage contributions and to average out noise inU(I) . The drawback of this measuring technique is that possible additional effects occurring during the variation of the current such as flux flow instabilities are, in principle, not detected. Therefore, the facility JUMBO was upgraded to allow also continuous high resolution measurements ofU(I) while ramping the current. In addition to the advancement of the measuring equipment, grounding and shielding of the whole facility was improved to reduce the influence of electromagnetic perturbations. In this paper, first measurement results with this new setup are presented and the impact of the current-ramping on theU(I)-measurements is discussed.
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Hornung et al. (2009) studied this question.
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