Cryogenic design of tokamak COMPASS Upgrade

The COMPASS-U tokamak, currently being built at IPP Prague, will employ cryo- genically cooled copper coils and other components operating near 80 K. This thesis presents the design of the cryogenic systems required for its operation. It includes eval- uation of coolants, operating pressures and cooling schemes, as well as thermal analysis and cooling-channel design for the coils and support structure, using both simplified and three-dimensional models. The work further defines the main operating modes of the cryoplant, designed to deliver up to 200 kW of cooling power, and develops the corre- sponding process flow diagrams and system requirements. Heat budgets and thermal insulation of the tokamak assembly are analysed, and an insulation test apparatus is designed and built to validate the proposed solutions. The results provide a coherent overview of COMPASS-U cryogenics and outline future development directions.