Controlling a new plasma regime

Area of Science:

• Nuclear Fusion Engineering
• Plasma Physics
• Control Systems

Background:

• The UK's Spherical Tokamak for Energy Production (STEP) program requires a sophisticated plasma control system.
• STEP's operational environment and plasma regimes will differ significantly from existing tokamaks.
• Self-organizing plasma behavior during fusion burn presents unique control challenges.

Purpose of the Study:

• To outline the design of a robust plasma control system for the STEP program.
• To address the complexities of controlling plasma from initiation through to safe termination.
• To develop strategies for managing both normal operation and exceptional events.

Main Methods:

• Design of individual controllers for plasma shape, position, and magneto-hydrodynamic instabilities.
• Development of control strategies for heat load management and fusion power regulation.
• Analysis of 'normal' operational scenarios and planning for exception handling.

Main Results:

• Progress in designing individual control components for key plasma parameters.
• Consideration of the unique challenges posed by STEP's spherical tokamak configuration.
• Development of a control philosophy encompassing both standard and off-normal event management.

Conclusions:

• A comprehensive plasma control system is essential for STEP's success.
• Addressing STEP's unique plasma physics and operational constraints is critical for fusion power.
• The proposed control strategy aims to ensure safe and efficient operation, paving the way for fusion energy delivery.