Modeling resistive-inductive evolution of currents in Wendelstein 7-X
This research investigates the temporal evolution of the toroidal plasma current in the Wendelstein 7-X (W7-X) stellarator under different heating, fueling, and current drive scenarios. The THRIFT code has been modernized and its predictions of the evolution of the toroidal current have been compare...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/adaed3 |
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| author | L. van Ham S.A. Lazerson J.C. Schmitt B.F. Lee M. Beurskens K.J. Brunner N. Chaudhary G. Fuchert J. Geiger M. Hirsch J. Knauer A. Langenberg J.W. Oosterbeek N. Pablant E. Pasch K. Rahbarnia G. Weir the W7-X Team |
| author_facet | L. van Ham S.A. Lazerson J.C. Schmitt B.F. Lee M. Beurskens K.J. Brunner N. Chaudhary G. Fuchert J. Geiger M. Hirsch J. Knauer A. Langenberg J.W. Oosterbeek N. Pablant E. Pasch K. Rahbarnia G. Weir the W7-X Team |
| author_sort | L. van Ham |
| collection | DOAJ |
| description | This research investigates the temporal evolution of the toroidal plasma current in the Wendelstein 7-X (W7-X) stellarator under different heating, fueling, and current drive scenarios. The THRIFT code has been modernized and its predictions of the evolution of the toroidal current have been compared against experimentally measured currents in W7-X. Good agreement is found with respect to the characteristic timescale between experimentally measured and simulated toroidal currents. The total bootstrap current is under-predicted owing to the applicability of the BOOTSJ model for the plasma collisionalities in question. Edge plasma resistivity is found to play an important role in the asymptotic behavior of the evolution of the current, indicating a possible limitation of the minimum plasma temperature when applying this model. Simulations of ECCD and heating power steps show THRIFT is capable of capturing the dynamical evolution of the current in response to changes in current sources. Future uses of THRIFT include validating and benchmarking other non-inductive current models. |
| format | Article |
| id | doaj-art-27ba0edd8ce84dd2ba1c7e100fc5a3c9 |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-27ba0edd8ce84dd2ba1c7e100fc5a3c92025-02-07T09:01:26ZengIOP PublishingNuclear Fusion0029-55152025-01-0165303600110.1088/1741-4326/adaed3Modeling resistive-inductive evolution of currents in Wendelstein 7-XL. van Ham0https://orcid.org/0009-0002-6815-0200S.A. Lazerson1https://orcid.org/0000-0001-8002-0121J.C. Schmitt2https://orcid.org/0000-0002-9407-7636B.F. Lee3https://orcid.org/0000-0002-3606-8467M. Beurskens4https://orcid.org/0000-0002-3354-0279K.J. Brunner5https://orcid.org/0000-0002-0974-0457N. Chaudhary6https://orcid.org/0000-0001-5075-2487G. Fuchert7J. Geiger8https://orcid.org/0000-0003-4268-7480M. Hirsch9J. Knauer10A. Langenberg11https://orcid.org/0000-0002-2107-5488J.W. Oosterbeek12N. Pablant13https://orcid.org/0000-0001-6617-8459E. Pasch14K. Rahbarnia15https://orcid.org/0000-0002-5550-1801G. Weir16https://orcid.org/0000-0002-2370-409Xthe W7-X Team17Max-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyGauss Fusion GmbH , 85748 Garching bei München, GermanyAuburn University , Auburn, AL, United States of AmericaPrinceton University Plasma Physics Laboratory , Princeton, NJ, United States of AmericaMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyPrinceton University Plasma Physics Laboratory , Princeton, NJ, United States of AmericaMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyMax-Planck-Institut fur Plasmaphysik , 17491 Greifswald, GermanyThis research investigates the temporal evolution of the toroidal plasma current in the Wendelstein 7-X (W7-X) stellarator under different heating, fueling, and current drive scenarios. The THRIFT code has been modernized and its predictions of the evolution of the toroidal current have been compared against experimentally measured currents in W7-X. Good agreement is found with respect to the characteristic timescale between experimentally measured and simulated toroidal currents. The total bootstrap current is under-predicted owing to the applicability of the BOOTSJ model for the plasma collisionalities in question. Edge plasma resistivity is found to play an important role in the asymptotic behavior of the evolution of the current, indicating a possible limitation of the minimum plasma temperature when applying this model. Simulations of ECCD and heating power steps show THRIFT is capable of capturing the dynamical evolution of the current in response to changes in current sources. Future uses of THRIFT include validating and benchmarking other non-inductive current models.https://doi.org/10.1088/1741-4326/adaed3Wendelstein 7-Xbootstrap currentcurrent driveTHRIFTBOOTSJ |
| spellingShingle | L. van Ham S.A. Lazerson J.C. Schmitt B.F. Lee M. Beurskens K.J. Brunner N. Chaudhary G. Fuchert J. Geiger M. Hirsch J. Knauer A. Langenberg J.W. Oosterbeek N. Pablant E. Pasch K. Rahbarnia G. Weir the W7-X Team Modeling resistive-inductive evolution of currents in Wendelstein 7-X Nuclear Fusion Wendelstein 7-X bootstrap current current drive THRIFT BOOTSJ |
| title | Modeling resistive-inductive evolution of currents in Wendelstein 7-X |
| title_full | Modeling resistive-inductive evolution of currents in Wendelstein 7-X |
| title_fullStr | Modeling resistive-inductive evolution of currents in Wendelstein 7-X |
| title_full_unstemmed | Modeling resistive-inductive evolution of currents in Wendelstein 7-X |
| title_short | Modeling resistive-inductive evolution of currents in Wendelstein 7-X |
| title_sort | modeling resistive inductive evolution of currents in wendelstein 7 x |
| topic | Wendelstein 7-X bootstrap current current drive THRIFT BOOTSJ |
| url | https://doi.org/10.1088/1741-4326/adaed3 |
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