Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations

the ASDEX Upgrade Team

doi:10.1016/j.nme.2016.12.035

Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations

the ASDEX Upgrade Team

Associate Professorship of Plasma-Material-Wechselwirkung

Max Planck Institute for Plasma Physics

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

We discuss the benefits of installing a pair of in-vessel coils with currents |I_fx| ≲ 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.

Original language	English
Pages (from-to)	1037-1042
Number of pages	6
Journal	Nuclear Materials and Energy
Volume	12
DOIs	https://doi.org/10.1016/j.nme.2016.12.035
State	Published - Aug 2017

Keywords

ASDEX Upgrade
Alternative divertor
EMC3-EIRENE
Flux expansion
Power exhaust
Tokamak

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10.1016/j.nme.2016.12.035

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title = "Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations",

abstract = "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 {\textquoteleft}alternative{\textquoteright} 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 = "ASDEX Upgrade, Alternative divertor, EMC3-EIRENE, Flux expansion, Power exhaust, Tokamak",

author = "\{the ASDEX Upgrade Team\} and T. Lunt and H. Zohm and A. Herrmann and A. Kallenbach and M. Dunne and Y. Feng and R. Neu and M. Wischmeier",

note = "Publisher Copyright: {\textcopyright} 2017 The Authors",

year = "2017",

month = aug,

doi = "10.1016/j.nme.2016.12.035",

language = "English",

volume = "12",

pages = "1037--1042",

journal = "Nuclear Materials and Energy",

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T1 - Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations

AU - the ASDEX Upgrade Team

AU - Lunt, T.

AU - Zohm, H.

AU - Herrmann, A.

AU - Kallenbach, A.

AU - Dunne, M.

AU - Feng, Y.

AU - Neu, R.

AU - Wischmeier, M.

PY - 2017/8

Y1 - 2017/8

N2 - 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.

AB - 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.

KW - ASDEX Upgrade

KW - Alternative divertor

KW - EMC3-EIRENE

KW - Flux expansion

KW - Power exhaust

KW - Tokamak

UR - https://www.scopus.com/pages/publications/85015408196

U2 - 10.1016/j.nme.2016.12.035

DO - 10.1016/j.nme.2016.12.035

M3 - Article

AN - SCOPUS:85015408196

SN - 2352-1791

VL - 12

SP - 1037

EP - 1042

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

Proposal of an alternative upper divertor in ASDEX Upgrade supported by EMC3-EIRENE simulations

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Keywords

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