@article{Kodaka_Noguchi_2021, title={INVESTIGATION ON STABILITY OF PANCAKE COILS WOUND WITH BUNDLED MULTIPLE REBCO CONDUCTORS}, volume={1}, url={https://js.ugd.edu.mk/index.php/etima/article/view/4525}, abstractNote={<p><strong>Abstract</strong><br>REBCO (Rare-Earth Barium Copper Oxide) pancake coils without turn-to-turn insulation, called noinsulation<br>(NI) winding technique, have shown a high thermal stability against normal state transition. REBCO<br>is the 2nd-generation high-temperature superconductor (HTS) with great properties. In recent years, NI REBCO<br>coils have been desired for practical ultra-high magnetic field applications. It has been reported, as an<br>experimental result, that the excitation delay, which is a problem of the conventional NI REBCO pancake coils,<br>is improved by coils wound with multi-bundled REBCO conductor (MB NI REBCO coils). As an operating current<br>may not be evenly distributed in each bundled tape due to the different inductances, the current distribution in<br>MB NI coils is complicated. Therefore, we must clarify the excitation characteristics and the current and thermal<br>stability of MB NI REBCO pancake coils using numerical simulation. We also compared the cases with and<br>without insulation between turns. For a current simulation, an MB NI REBCO coil is modeled using a Partial<br>Element Equivalent Circuit (PEEC) method. From the simulation results, it was confirmed that the excitation<br>delay was improved by a multi-bundled REBCO conductor. Furthermore, we found that the MB NI REBCO coil<br>without turn-to-turn insulation was the most stable because the current could be distributed widely, not<br>concentrated.<br><strong>Key words</strong><br>HTS magnets, No-insulation, thermal-stability, ultra-high field.</p&gt;}, number={1}, journal={ETIMA}, author={Kodaka, Kazuma and Noguchi, So}, year={2021}, month={Oct.}, pages={336-342} }