Quench development analysis in HTSC coils by use of the universal scaling theory

The theory, describing thermal quench in HTSC devices, was developed. It permits evaluation of thermal quench conditions and development dependent on materials' parameters and cooling. Thermal quench threshold current and time characteristics of the quench can be predicted. The theory has been extensively verified by experiments with different superconducting HTSC devices. Good correspondence between theory and experiments has been observed. We use this theory to analyze the thermal quench emergence conditions that are dependent on cooling, sizes of the device, material properties, etc. It was shown, that with increase of the size of the device threshold thermal quench current may become less than standard determined critical current. Time characteristics of the thermal quench increase with sizes. The analysis is supported by comparison with experiments with different HTSC coils.