The interior of the Versatile Toroidal Facility (VTF) experiment at MIT's Plasma Science. At high temperatures plasmas are generally "frozen" to magnetic field lines. Plasmas can however break free rapidly in a process called "magnetic reconnection." The VTF experiment has enabled researchers to gain significant new insight into the fundamental mechanisms that allow magnetic field lines to break and reconnect at rapid rates. The animation shows the interior of the VTF experiment, including the array of Langmuir probes used to measure densities in the plasma, and also an array of devices for measuring the magnetic field.