Speaker
Sungjin Kwon
(DEMO Technology Division)
Description
The preliminary conceptual design study on the Korean fusion demonstration reactor (K-DEMO) tokamak consists of the vacuum vessel, the in-vessel components, and the superconducting magnet system, and so on [1]. The K-DEMO superconducting magnet system contains 16 toroidal field (TF) coils, 8 central solenoid (CS) coils and 12 poloidal field (PF) coils. The magnetic field at the plasma center is about 7.4 T and the peak field is as high as ~16 T. The magnetic fields induced by these coils enormously influence the design of divertor modules as the form of electromagnetic (EM) loads. EM loads caused by the major disruption, the vertical disruption event of plasma or the magnet fast discharge are one of the most severe external force for divertor modules as well as the thermal loads caused by high heat flux on the divertor target. The aim of this study is to estimate the EM loads on the K-DEMO divertor module by EM analyses using ANSYS-EMAG. The conceptual model of the K-DEMO divertor module including outboard and inboard targets, dome, and the cassette body with connecting supports were developed to carry out EM analyses. A water-cooled divertor concept applying tungsten monoblock type has been primarily considered [2]. Since the reduced activation ferritic martensite (RAFM) steel has been taken into account as the heat sink material for the divertor target, Maxwell force caused by the magnetization of RAFM was also estimated as well as Lorentz force induced by the magnetic field and eddy current.
[1] Keeman Kim et al., “Design of K-DEMO for Near-Term Implementation”, Nuclear Fusion 55 (2015) 053027.
[2] K. Im, J. S. Park, and S. Kwon, “A Preliminary Development of the K-DEMO Divertor Concept”, Submitted to IEEE Transactions on Plasma Science, 2015
Co-authors
Jong Sung Park
(DEMO Technology Division, NationalFusionResearchInstitute, Daejeon, South Korea)
Kihak Im
(DEMO Technology Division, NationalFusionResearchInstitute, Daejeon, South Korea)
Sungjin Kwon
(DEMO Technology Division, NationalFusionResearchInstitute, Daejeon, South Korea)
