Heliotron J is a type of experimental fusion reactor located in Japan, specifically at the National Institute for Fusion Science (NIFS) in Toki, Gifu Prefecture. It is a stellarator, a type of magnetic confinement device designed to contain hot plasma needed for nuclear fusion. Stellarators like Heliotron J use a complex arrangement of magnetic fields to confine the plasma without requiring the large currents typically used in tokamaks.
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