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</script>Novel power exhaust solutions are being developed to address the challenge of integrating a high performance fusion plasma with a well protected divertor, should the Single Null configuration not scale to a reactor device. This work aims to elucidate the physics mechanisms responsible for the reduction in peak target heat flux in configurations with multiple X-points. Experimental studies on TCV in the Snowflake Minus are extended to a novel configuration with three nearby divertor X-points, termed a Jellyfish, allowing us to enhance the expected effects of an additional divertor X-point. These studies are complemented by 1D scrape-off layer (SOL) modelling with the SPLEND1D code and interpretative modelling, applying edge transport code EMC3-EIRENE to the Snowflake Minus, to further elucidate the key underlying processes. We find that these configurations exhibit reductions in peak target heat flux and earlier detachment onset compared to the Single Null. A strong correlation is experimentally observed between the radially localised radiated power and connection length. While this does not necessarily map to higher total divertor radiative losses for multiple X-point configurations, it can provide some control over the radial position of the radiation distribution. Experiments exhibit inter-null radial striations in the emissivity of multiple spectral lines. Although comparisons with EMC3-EIRENE simulations support enhanced inter-null cross-field transport, additional transport physics is required to obtain a quantitative match with experiment. No significant differences in divertor-core compatibility are attributed to the presence of additional divertor X-points. However, impurity source optimisation is required to ensure a low core impurity content.
Physical sciences, FOS: Physical sciences
Physical sciences, FOS: Physical sciences
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