Indeed, fusion reactors, if they ever really work, will become inexhaustible sources of clean energy resulting from nuclear fusion processes, like those that go only inside stars. Currently, many scientists are working on the creation of thermonuclear reactors of various types and recently scientists from the Institute of Plasma Physics, Prague, published a video in which you can see with your own eyes what is happening in the chamber of a launched tokamak-type thermonuclear reactor.
The video below was filmed back on January 20, 2016 using a Photron Mini UX100 camera, the lens of which looked into the camera of the COMPASS experimental reactor. This reactor is relatively small; it itself and its plasma chamber are 10 times smaller than the size of the ITER thermonuclear reactor, which is currently under construction in southern France.
This video was shot at variable speed from 1000 to 20,000 frames per second, due to which about two seconds of real time were stretched per minute of video.
Some excerpts from the video have been "wandering" on the net since last year. But only recently, scientists have posted a full video in open access, which shows the sequence of switching on the reactor's magnetic system, the formation of a plasma cord, its heating to a high temperature and "feeding" the plasma with an additional gaseous substance.
The most interesting aspect of the video is the bright spots and flares that occur in the plasma. They are the evaporated particles of the material of the walls of the reactor chamber, which are split off from them at the moments of contact of the walls with the super-temperature plasma. And this speaks of not very satisfactory operation of the magnetic system of the reactor, which should prevent the contact of the plasma with the environment.