Abstract
In this work we calculate the radiation power losses as a function of temperature (T) and as a function of density (ne). The radiation losses strongly influence the fusion power density and attainability of ignition. Radiation power loss include recombination radiation (PR), bremsstrahlung radiation (PB), line radiation (PL), and cyclotron radiation (PC) for plasma in toroidal fusion reactors. We do these calculation because the radiation power losses decrease the net power we get from fusion reactors and losing the plasma particles so we must determine these losses to understanding how can we reduced these losses to increase the net fusion reactors power through confining the plasma particles as long as possible .