In fusion plasmas, where electron temperatures range from keV to hundreds of keV, bremsstrahlung radiation constitutes a significant energy loss mechanism. While various thermal average fitting formulas exist in the literature, their accuracy is limited, particularly for keV with error . Additionally, non-relativistic fitting formulas become invalid for keV. The accurate calculation of bremsstrahlung radiation is important for fusion gain study, especially of advanced fuels fusion. In this work, we develop new but still simple fitting formulas that are valid for electron temperatures ranging from small ( keV) to extreme relativistic range, with errors of less than 1% even for high atomic number ions (e.g. Z = 30), which could be sufficient for fusion plasma applications. Both electron–ion (e–i) and electron–electron (e–e) bremsstrahlung radiations are considered. Both polynomial fitting with truncated () and one-fit-all formulas are provided. Additionally, we offer fitting formulas for e–i and e–e specifically for electron energies, which could prove useful in non-Maxwellian bremsstrahlung radiation studies.
This paper presents new, accurate analytical fitting formulas for calculating bremsstrahlung radiation power in fusion plasmas, covering a wide range of electron temperatures from low to extreme relativistic. The formulas consider both electron-ion and electron-electron bremsstrahlung, with errors less than 1% even for high atomic number ions. These improved models are crucial for fusion gain studies, especially for advanced fuels.