The core of a fusion power plant will contain a hot plasma, a unique form of matter which will be described shortly. This energy-producing substance will deliver about 80% of its energy in the form of fast neutrons which will quickly leave the reaction region. The energy of the neutrons is then converted to heat energy in a moderating region surrounding the plasma region. The heated moderator transfers its thermal energy to a working fluid which then directly (if the fluid is water) or indirectly produces steam to drive a turbine (Figure 1).

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