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For sustained, controlled fusion
reactions, a fission bomb
obviously cannot be used to trigger the reaction. The
difficulties of controlled
fusion center on the containment of the nuclear fuel at
the extremely high temperatures
necessary for fusion for a time long enough to allow the
reaction to take place.
For deuterium-tritium fusion, this time is about 0.1 sec.
At such temperatures
the fuel is no longer in one of the ordinary states of
matter but is instead a
plasma , consisting of a mixture of electrons and charged
atoms. Obviously, no
solid container could hold such a hot mixture; therefore,
containment attempts
have been based on the electrical and magnetic properties
of a plasma, using magnetic
fields to form a “magnetic bottle.” Another method has
used laser beams aimed
at tiny pellets of fusion fuel.
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