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Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations
We discuss the benefits of installing a pair of in-vessel coils with currents |Ifx| ≲ 50 kAt in the upper divertor of ASDEX Upgrade (AUG) to study a series of ‘alternative’ divertor configurations, like the Snowflake (SF) and the X-divertor (XD), that are currently considered as alternative solutions for the power exhaust problem. The possibility of operating the standard lower single-null (SN) and double-null (DN) would be preserved. Potential effects to reduce the peak parallel- and/or perpendicular heat flux are predicted from a simple geometrical-diffusive model as well as by numerical EMC3-EIRENE simulations for pure deuterium attached conditions with spatially constant diffusion coefficients. Beyond that a series of other potential transport- and radiation related heat flux mitigation effects are identified and could be studied experimentally with the modified upper divertor in the high-power divertor Tokamak AUG. Keywords: Power exhaust, Alternative divertor, ASDEX Upgrade, EMC3-EIRENE, Tokamak, Flux expansion
Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations
We discuss the benefits of installing a pair of in-vessel coils with currents |Ifx| ≲ 50 kAt in the upper divertor of ASDEX Upgrade (AUG) to study a series of ‘alternative’ divertor configurations, like the Snowflake (SF) and the X-divertor (XD), that are currently considered as alternative solutions for the power exhaust problem. The possibility of operating the standard lower single-null (SN) and double-null (DN) would be preserved. Potential effects to reduce the peak parallel- and/or perpendicular heat flux are predicted from a simple geometrical-diffusive model as well as by numerical EMC3-EIRENE simulations for pure deuterium attached conditions with spatially constant diffusion coefficients. Beyond that a series of other potential transport- and radiation related heat flux mitigation effects are identified and could be studied experimentally with the modified upper divertor in the high-power divertor Tokamak AUG. Keywords: Power exhaust, Alternative divertor, ASDEX Upgrade, EMC3-EIRENE, Tokamak, Flux expansion
Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations
T. Lunt (author) / H. Zohm (author) / A. Herrmann (author) / A. Kallenbach (author) / M. Dunne (author) / Y. Feng (author) / R. Neu (author) / M. Wischmeier (author)
2017
Article (Journal)
Electronic Resource
Unknown
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