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이현정,오영국,김웅채,박수환,김형찬,김기만,Lee, H.J.,Oh, Y.K.,Kim, W.C.,Park, S.H.,Kim, H.C.,Kim, K. 한국초전도학회 2007 Progress in superconductivity Vol.8 No.2
Since the margins for the minimum quench energy and for the operating current in the superconducting magnet determine the operating regime of the magnet, a thermal stability analysis for the KSTAR superconducting magnet system is performed using 1-D Gandalf code. The result shows that the minimum quench energy is about 500 mJ/cc and the operating current margin is about 70 %. These values are larger than those of the KSTAR design criteria and the KSTAR superconducting magnet system can be operated stably under various experimental environments.
KSTAR PF 초전도자석의 크기 및 재료에 따른 결합손실 특성 분석
이현정,추용,이상일,박영민,박현택,오영국,Lee, H.J.,Chu, Y.,Lee, S.,Park, Y.M.,Park, H.T.,Oh, Y.K. 한국초전도저온학회 2009 한국초전도저온공학회논문지 Vol.11 No.3
It is important to predict AC loss in $Nb_3Sn$ and NbTi cable-in-conduit-conductor (CICC) reliably for the design and operation of large superconducting coils. The hysteresis loss in the superconducting filaments and coupling loss within strands and among strands in a cable or composite are dominant ac losses in superconducting magnets. The coupling loss in a superconductor can be characterized by identifying the coupling constant time $n{\tau}$. To reduce the coupling loss, all the strands (superconductor and Cu) in KSTAR (Korea Superconducting Tokamak Advance Research) are chromium plated with thickness of $l{\pm}0.5{\mu}m$. The ac losses of PF1, PF5 and PF6 coils has been measured by calorimetric method while applying trapezoidal current pulses with various ramp rate from 0.5 kA/s to 2 kA/s. The coupling time constants for $Nb_3Sn$ coils are $25{\sim}55$ ms and the values are not co-related with the coil size, the time constants for NbTi coil is 30 ms.