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CRP64 - Progress on Conceptual Design of the K-DEMO Magnet System

Progress on Conceptual Design of the K-DEMO Magnet System

Keeman Kim1, Sangjun Oh1, Jong Sung Park1, Kihak Im1, Hyung Chan Kim1, Gyung-Su Lee1, George Neilson2, Thomas Brown2, Charles Kessel2, Peter Titus2, and Yuhu Zhai2
1National Fusion Research Institute, 169-148 Gwahak-ro, Daejeon 305-806, the Republic of Korea
2Princeton Plasma Physics Laboratory, Princeton, NJ 08543, U.S.A.
Abstract — Korean Fusion Energy Development Promotion Law (FEDPL) was enacted in 2007 and a following step, a conceptual design study for a steady-state Korean fusion demonstration reactor (K-DEMO) has been initiated in 2012.
One special concept of K-DEMO is a two-staged development plan. At first, K-DEMO is designed not only to demonstrate a net electricity generation and a self-sustained tritium cycle (Tritium Breeding Ratio > 1.05), but also to be used as a component test facility. Then, at its second stage, a major upgrade is carried out by replacing in-vessel components in order to show a net electric generation on the order of 500 MWe. After a thorough 0-D system analysis, the major radius and minor radius are chosen to be 6.8 m and 2.1 m, respectively, considering practical engineering feasibilities. In order to minimize the deflection of wave and maximize the efficiency, a top launch high frequency (> 200 GHz) electron cyclotron current drive (ECCD) system is considered and, for matching the high frequency ECCD, a high magnetic field is required and it can be achieved by using high performance Nb3Sn-based superconducting magnet and the peak magnetic field is approaching to 16 T with the magnetic field at the plasma center ~7 T. As advantages of using high magnetic field, the operation limits of maximum plasma current and density can be increased and also a higher fusion power can be achieved with a same reactor construction cost. The K-DEMO magnet system consists of 16 TF coils, 8 central solenoid (CS) coils, and 12 poloidal field (PF) coils. Internally cooled cable-in-conduit conductors (CICC’s) are used in all of the K-DEMO coils. Key features of the K-DEMO magnet system include the use of two TF coil winding packs, each of a different conductor design, to reduce the construction cost and save the space for the magnet structure material. The conceptual design of K-DEMO magnet system is presented together with preliminary design parameters.
This work is supported by the Ministry of Science, ICT and Future Planning, the Republic of Korea.
Keywords (Index Terms) — K-DEMO, superconducting magnet, graded TF Coil, helical cooling spiral, rectangular CICC.
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), January 2016. 
Submitted Novermber 13, 2015; Selected November 13, 2015. Reference No. CRP64; Category 6. 

This plenary presentation 2PL_01 was given at MT-24. Not submitted to IEEE Trans. Appl. Supercond. for possible publication.