The GERDA collaboration is performing a search for neutrinoless double beta decay of 76 Ge with the eponymous detector. The experiment has been installed and commissioned at the Laboratori Nazionali del Gran Sasso and has started operation in November 2011. The design, construction and first operational results are described, along with detailed information from the R&D phase.
This paper presents a study of frequency dependence of the overcurrent characteristics of high-temperature superconducting (HTS) tape. Fault currents with different amplitudes and frequencies are applied to HTS tape, and the relationship between the overcurrent characteristics and current parameters are obtained after processing and analyzing the experimental results. In addition, a phase difference between the current peak and voltage peak is found in these experiments. Using both simulations and experiments, studies are carried out to find the reason for this phenomenon. Conclusions given in this paper provide useful information for optimizing the design of superconducting apparatus.
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