At the required plasma temperature for fusion (～ 100 million ℃) an isolation of the plasma from any material, is essential. Magnetic confinement is the preferred option for the development of commercial fusion energy exploitation. Two principles of magnetic confinement are presently applied in experimental facilities, namely the stellarator and the tokamak, the latter being more advanced. The arrangement and function of the tokamak is explained. Furthermore plasma phenomena such as turbulence leading to enhanced energy transport and thus to deterioration of the plasma confinement as well as counter measures are discussed.
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