Bootstrap current

In a toroidal fusion power device, a plasma is confined within a donut-shaped cylinder. If the gas pressure of the plasma varies across the radius of the cylinder, an electrical current will naturally arise within the plasma. This bootstrap current, and is commonly found in the tokamak reactor design. The tokamak uses a combination of external magnets and a current driven in the plasma to create a stable confinement system. One goal of advanced tokamak designs is to maximize the bootstrap current, and thereby reduce or eliminate the need for an external current driver. This could dramatically reduce the cost and complexity of the device.

References

• "Self Generated “Bootstrap” Current Contains Magnetic Fusion Plasma", General Atomics
• "Plasma Dictionary", Nagoya University