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This paper shows first quantitative analysis of the detachment processes inthe MAST Upgrade Super-X divertor (SXD). We identify an unprecedented impact ofplasma-molecular interactions involving molecular ions (likely $D_2^+$),resulting in strong ion sinks (Molecular Activated Recombination - MAR),leading to a reduction of ion target flux. The MAR ion sinks exceed thedivertor ion sources before electron-ion recombination (EIR) starts to occur,suggesting that significant ionisation occurs outside of the divertor chamber.In the EIR region, $T_e \ll 0.2$ eV is observed and MAR remains significant inthese deep detached phases. The total ion sink strength demonstrates thecapability for particle (ion) exhaust in the Super-X Configuration.  Molecular Activated Dissociation (MAD) is the dominant volumetric neutralatom creation process can lead to an electron cooling of 20\% of $P_{SOL}$. Themeasured total radiative power losses \emph{in the divertor chamber} areconsistent with inferred hydrogenic radiative power losses. This suggests thatintrinsic divertor impurity radiation, despite the carbon walls, is minor inthe divertor chamber. This contrasts previous TCV results, which may beassociated with enhanced plasma-neutral interactions and reduced chemicalerosion in the detached, tightly baffled SXD.  The above observations have also been observed in higher heat flux (narrowerSOL width) type I ELMy H-mode discharges. This provides evidence that thecharacterisation in this paper may be general.

The role of plasma-atom and molecule interactions on power \& particle balance during detachment on the MAST Upgrade Super-X divertor