Overview of Tokamak Energy's Fusion Pilot Plant Program

This submission presents an overview of Tokamak Energy's pre-concept design of its fusion pilot plant, ST-E1 - based on a high-field, low aspect ratio tokamak with high-temperature superconducting magnets. The design team has taken an iterative, integrated approach and has gone through multiple iterations of the design. Two-week iterations were followed by several two-month iterations, and finally one six-month iteration[PB1] . The team has remained similar in size throughout this work, emphasising integration and self-consistency over local, more detailed work. The final pre-conceptual design point, ST-E1 revision D, is a 5.0m major radius, aspect ratio of 2.3 and on-axis toroidal field of 5.25[PB2] T machine with a net power electric output of 450-750MW, depending on technology and physics assumptions. Crucially, the design of the maintenance scheme, and its implications on other systems, was considered very early on and is shown to be compatible with reactor-level performance and availability factor. The inclusion of an outboard-only liquid lithium breeder blanket allows for a tritium breeding factor of 1.2. This submission presents an overview of the program, its workflow and design point selection, as well as the overall design and key engineering decisions.