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Description
This paper presents the quench test results and analysis of no-insulation (NI) REBCO (Rare-Earth Barium Copper Oxide) double pancake racetrack coils under conduction cooling conditions. Two racetrack coils, differing in dimensions and number of turns (280 and 488 turns), were tested at a temperature of 50 K each. The current was ramped up to their critical values until quenching occurred, during which the terminal voltage, central magnetic field, and temperature distribution were monitored. To ensure the reliability and reproducibility of the results, each coil underwent quench testing at least three times. Both circuit-based and finite element method (FEM)-based simulations were conducted to analyze the coils' behavior during quench events. Additionally, inverse calculation techniques were employed to estimate peak temperature rises within the coils that could not be directly measured by the temperature sensors. The study also examined the impact of detailed coil design parameters—such as winding geometry and support structures—on quench behavior. Based on these findings, practical design recommendations are proposed to enhance the quench robustness and operational reliability of NI REBCO coils, contributing to the development of more resilient superconducting systems.
