Fusion Approach
Tokamak Parameters
Major Radius (m)Minor Radius (m)Plasma Current (MA)Toroidal Magnetic Field (T)Duration (s)
Publications Describing Device

On the confinement modeling of a high field spherical tokamak ST40

Overview of ST40 results and planned upgrades

ST Path to Fusion: First Results from ST40


ST40 is a high field spherical tokamak with a major radius of 40cm at Tokamak Energy. The device utilizes a 4m tall stainless steel vessel with copper toroidal field coils which produce magnetic fields up to 3T. ST40 uses a novel merging-compression method for plasma start-up. The objective of ST40 is to demonstrate burning plasma conditions in a high-field, low aspect ratio spherical tokamak.

Affiliated Organizations
In Operation

2017 - present