Wiktionary
n. (context physics English) A magnetic device used to confine a plasma, especially one used to sustain nuclear fusion
Wikipedia
A stellarator is a device used to confine hot plasma with magnetic fields in order to sustain a controlled nuclear fusion reaction. It is one of the earliest controlled fusion devices, first invented by Lyman Spitzer in 1950 and built the next year at what later became the Princeton Plasma Physics Laboratory. The name refers to the possibility of harnessing the power source of the sun, a stellar object.
Stellarators were popular in the 1950s and 1960s, but the much better results from tokamak designs led to them falling from favor in the 1970s. More recently, in the 1990s, problems with the tokamak concept have led to renewed interest in the stellarator design, and a number of new devices have been built. Some important modern stellarator experiments are Wendelstein 7-X in Germany, the Helically Symmetric Experiment (HSX) in the USA, and the Large Helical Device in Japan.
Usage examples of "stellarator".
The final product design reminded me of the old stellarator systems I worked on back in undergraduate school.
The stellarators were really weird arrangements of electromagnets that were used to create tight fields.
The interval of many days between actually left little to do, except for making astronomical observations, checking on the performance of the stellarators, setting a watch against the damage caused by meteors and micrometeors, and following the ordinary procedures of meals and sleep periods.