A magnetic mirror, also known as a magnetic trap or sometimes as a pyrotron, is a type of magnetic confinement fusion device used in fusion power to trap high-temperature plasma using magnetic fields.
A basic magnetic mirror machine including a charged particle's motion: The rings in the centre extend the confinement volume horizontally, but they are not strictly needed and are absent in many mirror machines.
Lawrence Livermore's Q-cumber device, seen in 1955 when it was still classified. It was among the first to clearly demonstrate confinement using the mirror effect.
The Baseball II was a superconducting version of the baseball coil design, seen here in 1969 during construction.
The 1978 2X magnetic bottle experiment. Fred Coensgen is pictured. The cylinder holds one set of neutral beam injectors, the mirror itself is not visible.
The polywell is a proposed design for a fusion reactor using an electric and magnetic field to heat ions to fusion conditions.
Magnetic mirror
…particles inside a biconic cusp. The most financed cusp approach is the Compact Fusion Reactor which was supported by Lockheed-Martin starting in 2007. Polywell Magnetic mirror point…
A Farnsworth–Hirsch fusor during operation in star mode, characterized by "rays" of glowing plasma which appear to emanate from the gaps in the inner grid
Figure 2: A plot of the magnetic field generated by the MaGrid inside a polywell. The null point is marked in red in the center.
Figure 4: Illustration of single electron motion inside the polywell. It is based on figures from "Low beta confinement in a polywell modeled with conventional point cusp theories" but is not an exact copy.