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Optimization of the snowflake divertor for power and particle exhaust on NSTX–U

Author(s): Vail, PJ; Izacard, O; Kolemen, Egemen

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dc.contributor.authorVail, PJ-
dc.contributor.authorIzacard, O-
dc.contributor.authorKolemen, Egemen-
dc.date.accessioned2020-04-01T13:22:27Z-
dc.date.available2020-04-01T13:22:27Z-
dc.date.issued2019en_US
dc.identifier.citationVail, PJ, Izacard, O, Kolemen, E. (2019). Optimization of the snowflake divertor for power and particle exhaust on NSTX–U. Nuclear Materials and Energy, 19 (516 - 523. doi:10.1016/j.nme.2019.03.003en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1cn4c-
dc.description.abstractIn this paper, simple analytical modeling and numerical simulations performed with the multi-fluid edge transport code UEDGE are used to identify optimal snowflake divertor (SFD) configurations for heat flux mitigation and sufficient cryopumping performance on the National Spherical Torus eXperiment Upgrade (NSTX–U). A model is presented that describes the partitioning of sheath-limited SOL power and particle exhaust in the SFD as a result of diffusive transport to multiple activated strike points. The model is validated against UEDGE predictions and used to analyze a database of 70 SFD-minus equilibria. The optimal location for the entrance to a divertor cryopumping system on NSTX–U is computed for enabling sufficient pumping performance with acceptable power loading in a variety of SFD-minus configurations. UEDGE simulations of one promising equilibrium from the database indicate that a significant redistribution of power to the divertor legs occurs as a result of neutral particle removal near one of the SFD-minus strike points in the outboard scrape-off layer. It is concluded that pump placement at the optimal location is advantageous as the large number of compatible equilibria reduces the precision required of real-time SFD configuration control systems and enables acceptable divertor solutions even if UEDGE-predicted power redistribution slightly reduces the achievable pumping performance.en_US
dc.format.extent516 - 523en_US
dc.language.isoen_USen_US
dc.relation.ispartofNuclear Materials and Energyen_US
dc.rightsFinal published version. This is an open access article.en_US
dc.titleOptimization of the snowflake divertor for power and particle exhaust on NSTX–Uen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1016/j.nme.2019.03.003-
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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