Speaker
Bostjan Koncar
(Jožef Stefan Institute)
Description
Thermal radiation analysis of the DEMO tokamak based on the updated CAD design of in-vessel components and magnet system has been carried out. For the purpose of the analysis, Vacuum Vessel Thermal Shield (VVTS), Cryostat Thermal Shield (CTS) and some support structures have been created additionally (on a conceptual level) to complement the overall DEMO CAD design model. The Finite Element (FE) code ABAQUS was used to perform numerical analyses. Thermal radiation simulations in complex geometries can be largely affected by numerical errors due to calculation of geometrical view factors. Hence a special care was taken to adapt the geometry and mesh of the FE model to reduce the energy flux error to an acceptable level. The main simulation results provide thermal loading on different DEMO systems and components that enable also the calculation of refrigeration power required to cool the magnet systems and thermal shields. In addition, different thermal shielding configurations and scenarios were considered. Besides the base case with actively cooled thermal shields, also the configurations with passive Multi Layer Insulation (MLI) were analysed. The study also demonstrates the importance of 3D simulations for optimisation of thermal shielding in order to reduce the local heat load peaks.
Co-authors
Bostjan Koncar
(Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia)
Botond Meszaros
(PPPT, PMU, Eurofusion, Boltzmannstrasse 2, 85748 Garching, Germany)
Martin Draksler
(Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia)
Oriol Costa Garrido
(Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia)
