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Divertor plasma detachment is likely needed for the function of magneticallyconfined nuclear fusion. It greatly reduces the particle and heat flux incidenton a target, and thus reduces the sputtering and heat loading on the target. Itis therefore advantageous to have accurate simulations of plasma behaviour inthe divertor to design future Tokamak divertors. A common simulation packageused for this purpose is SOLPS-ITER, which has previously been observed to beunderestimating the contribution of molecular effects to plasma detachment. Tocorrect this, its reaction rate for molecular charge exchange was altered. Thisalteration resulted in a significant increase in the density of $D_2^+$ ionswithin the divertor. The particle balance and $D\alpha$ emission data was thencomputed from the simulation outputs. These were compared to experimental dataand a set of post-processing routines for the original simulations thatpredicts the effect of a corrected charge exchange rate. In comparison to thepost-processing predictions: the increase in Molecular activated Recombinationand the depth of the target flux rollover was less than predicted. This is dueto the post-processing not being self consistent and it does not account forhow the alterations in reaction rate would affect the background plasma.Compared to the experimental data: the correction showed a significantimprovement in the agreement of general trends, such as the increased MARreaction rate and the rollover of target flux. However, there were stillsignificant disagreements in the magnitudes of various reaction rates,suggesting further improvements to SOLPS-ITER are still needed.

Investigation of atomic and molecular rates in plasma-edge simulations through experiment-simulation comparisons