Speaker
Laurent Jung
(National Fusion Research Institute)
Description
An elaborate control of waveforms of poloidal field (PF) coils is prerequisite to ensure a reliable plasma start-up in ITER. An additional requirement in the ITER PF coil scenario development is that coil currents should be optimized to minimize quench risks during a discharge. In this paper, we use the quadratic programming method to optimize ITER PF coil currents at the initial magnetization (IM) state. We set the total magnetic energy of the system as a cost function to be minimized and calculate coil currents satisfying the initial magnetization flux and field null constraints compatible with ITER scenarios. The maximum initial magnetization flux is determined by trade-off between temperature margin and the magnitude of coil current at IM state. On the basis of this parametric study, we propose an optimized constraints and corresponding coil currents of initial ITER PF coil currents. All the optimization package is developed using the ITER Integrated Modeling Analysis Suite (IMAS) data structure for an easy adaptation to the integrated ITER simulator in the future.
Co-authors
Hogun Jhang
(National Fusion Research Institute, Daejeon, South Korea)
Laurent Jung
(National Fusion Research Institute, Daejeon, South Korea)
Sanghee Hahn
(National Fusion Research Institute, Daejeon, South Korea)
Sehoon Ko
(National Fusion Research Institute, Daejeon, South Korea)
