What is stellarator physics?
What is stellarator physics?
A stellarator is a toroidal plasma confinement concept that uses effects that arise in the absence of toroidal symmetry to maintain the magnetic configuration without the need for current drive.
What is the difference between a stellarator and tokamak?
In the tokamak, the rotational transform of a helical magnetic field is formed by a toroidal field generated by external coils together with a poloidal field generated by the plasma current. In the stellarator, the twisting field is produced entirely by external non-axisymmetric coils.
How many tokamaks exist?
Several dozen tokamaks are now in operation around the world. The first to demonstrate fusion at significant scale (10 MW) was the Tokamak Fusion Test Reactor (TFTR) device at the Princeton Plasma Physics Laboratory, though it has since shut down.
What is AZ pinch?
In fusion power research, the Z-pinch (zeta pinch) is a type of plasma confinement system that uses an electric current in the plasma to generate a magnetic field that compresses it (see pinch). The name refers to the direction of the current in the devices, the Z-axis on a normal three-dimensional graph.
Why is confinement such a problem for fusion?
When fuel is injected into a fusion reactor, powerful “rogue” waves might be created that can cause it to escape confinement. These waves can reduce the efficiency or even stop the fusion reaction.
How does a tokamak make electricity?
Inside a tokamak, the energy produced through the fusion of atoms is absorbed as heat in the walls of the vessel. Just like a conventional power plant, a fusion power plant will use this heat to produce steam and then electricity by way of turbines and generators.
How is ITER doing?
As of May 2021 ITER is over 78% complete toward first plasma. Start is scheduled for late 2025. Ground was broken in 2007 and construction of the ITER tokamak complex started in 2013. Machine assembly was launched on 28 July 2020.
How hot is a tokamak?
150 million degrees Celsius
The temperatures inside the ITER Tokamak must reach 150 million degrees Celsius—or ten times the temperature at the core of the Sun—in order for the gas in the vacuum chamber to reach the plasma state and for the fusion reaction to occur.
What are tokamaks used for?
tokamak, Device used in nuclear-fusion research for magnetic confinement of plasma. It consists of a complex system of magnetic fields that confine the plasma of reactive charged particles in a hollow, doughnut-shaped container.
