The compact toroids (CTs) include Field Reversed Configurations (FRCs) and Spheromaks. They are characterized by the simply-connected configuration that requires no external magnet linking with toroidal plasma. This paper presents an introductory review on CT researches and contains the following chapters ; 1. Magnetic configurations of CT plasmas, 2. Generations of CTs, 3. The tilt instabilities, 4. The equilibrium and beta values of CTs, 5. The MHD relaxation of spheromaks in connection with those of RFPs, and 6. Prospects of DTs to fusion reactors.
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