Sensitivity of radiation to the superthermal electron population in mildly relativistic plasma

Synchrotron radiation has markedly different behavior in nonrelativistic (T_e ~ 10 keV) and in mildly relativistic (T_e ~ 100 keV) plasma. Superthermal electrons which occupy the tail of velocity distribution function have outsized impact on power loss of ~ 100 keV plasma. If electrons with energy more than a cutoff energy are redistributed while keeping the Maxwellian distribution function below cutoff energy intact, both emission and absorption of synchrotron radiation act to decrease the lost power. [1] Similarly, bremsstrahlung radiation is decreased if superthermal electrons are redistributed. [2] These novel radiation transport effects in non-equilibrium plasma suggest large utility in the deconfinement of high-energy electrons to reduce synchrotron radiation in applications where the radiation is deleterious. In particular, these effects can be significant in pB11 burning plasma.