Speaker
David Sestak
(Institute of Plasma Physics at the Czech Academy of Science)
Description
This contribution describes the electromagnetic and structural analysis of the new structural design of the COMPASS-U tokamak. The electromagnetic calculations solve force effects on tokamak coils using ANSYS Maxwell 3D code. The calculations were performed for three different combinations of excited coils and for two different plasma positions. The structural analysis was performed then using ANSYS Mechanical.
Electromagnetic set-up considered the central solenoid and poloidal and toroidal field coils, positioned in a cylindrical computational domain. The analysis also includes the plasma column, modelled as a conductive object with a defined electric current. The electromagnetic analysis solves the static magnetic field and forces that act on the tokamak coils.
The support structure, acting forces, and the coils are considered in the structure analysis. FEM model is built to describe the support structure, the stiffness of the tokamak structure was not influenced by the modelling method. The forces calculated in the electromagnetic analysis and the gravitational acceleration are used as the load in the static structural analysis which solves displacement field, stress, and behaviour of the contact interface between the structural parts the COMPASS-U tokamak.
The results of the structural analysis give similar displacement field and stress in all investigated variants. The analysis demonstrates significant torsional displacement of the central parts and high loads due to high pressures that are generated in the central solenoid. The perimeter support shows high stiffness.
The results serve to the team at Institute of Plasma Physics of the Czech Academy of Science to validate and upgrade the structural design of COMPASS-U. The results will be also used to suggest suitable structure design measures to reduce torsional displacements in the tokamak centre and thus to reduce the high mechanical stress in that part of the tokamak.
Co-authors
David Sestak
(Institute of Plasma Physics at the Czech Academy of Science, Tokamak Department, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic)
Jakub Hromadka
(TechSoft Engineering spol. s r.o., Na Pankráci 322/26, 140 00 Praha 4 - Nusle, Czech Republic)
Jindrich Kubak
(TechSoft Engineering spol. s r.o., Na Pankráci 322/26, 140 00 Praha 4 - Nusle, Czech Republic)
Josef Havlicek
(Institute of Plasma Physics at the Czech Academy of Science, Tokamak Department, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic)
Radek Fajtl
(TechSoft Engineering spol. s r.o., Na Pankráci 322/26, 140 00 Praha 4 - Nusle, Czech Republic)
Tomas Bakalar
(TechSoft Engineering spol. s r.o., Na Pankráci 322/26, 140 00 Praha 4 - Nusle, Czech Republic)
