An interatomic potential for W-N interactions

N-2 gas is routinely used as a seeding species in fusion plasma to control the amount of power emitted from the plasma by radiation to the tungsten walls of an ITER-like divertor. Nitrogen atoms interact with the plasma-facing materials beryllium and tungsten, and form chemical bonds with the wall surfaces, as well as with plasma hydrogen isotopes, thus raising a special interest in W-N and N-H interactions in the fusion community. In this work we describe the development of an analytical interatomic potential for W-N interactions and benchmark the potential against DFT calculation results for N defects in tungsten.Peer reviewe