Critical Impurity Concentrations for Ignition of Catalyzed-Deuterium Fusion Plasmas

The maximum concentrations, f_zc, of various impurity species that permit ignition of catalyzed-deuterium fusion plasmas have been calculated. If cyclotron radiation is negligible, the values of f_zc at 35 keV, where the fusion power density is maximum, are approximately one-fifth of the values allowed for deuterium-tritium ignited plasmas at 14 keV. For any impurity species, the allowed f_zc decreases nearly linearly with increasing cyclotron radiation loss.