<P> Fusion processes require fuel and a highly confined environment with a high temperature and pressure , to create a plasma in which fusion can occur . In stars , the most common fuel is hydrogen , and gravity creates the high temperature and confinement needed for fusion . Fusion reactors generally use hydrogen isotopes such as deuterium and tritium , which react more easily , and create a confined plasma of millions of degrees using inertial methods ( laser ) or magnetic methods ( tokamak and similar ) , although many other concepts have been attempted . The major challenges in realising fusion power are to engineer a system that can confine the plasma long enough at high enough temperature and density , for a long term reaction to occur , and for the most common reactions , managing neutrons that are released during the reaction , which over time can degrade many common materials used within the reaction chamber . </P>
<P> Fusion processes require fuel and a highly confined environment with a high temperature and pressure , to create a plasma in which fusion can occur . In stars , the most common fuel is hydrogen , and gravity creates the high temperature and confinement needed for fusion . Fusion reactors generally use hydrogen isotopes such as deuterium and tritium , which react more easily , and create a confined plasma of millions of degrees using inertial methods ( laser ) or magnetic methods ( tokamak and similar ) , although many other concepts have been attempted . The major challenges in realising fusion power are to engineer a system that can confine the plasma long enough at high enough temperature and density , for a long term reaction to occur , and for the most common reactions , managing neutrons that are released during the reaction , which over time can degrade many common materials used within the reaction chamber . </P>
what is the primary fuel that would be used in fusion reactors
what is the primary fuel that would be used in fusion reactors
hydrogen isotopes
hydrogen isotopes