Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITER
The study aims to estimate the influence of machine scale size on the behavior of plasma with extrinsic seeded impurities in the scrape-off layer (SOL) and divertor. This is performed through the comparison of plasma boundary simulations using the SOLPS-ITER code including drifts and currents of nit...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-05-01
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| Series: | Nuclear Materials and Energy |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179118303120 |
| _version_ | 1819072305190404096 |
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| author | Elizaveta Sytova Richard A. Pitts Elizaveta Kaveeva Xavier Bonnin David Coster Vladimir Rozhansky Ilya Senichenkov Irina Veselova Sergey Voskoboynikov Felix Reimold |
| author_facet | Elizaveta Sytova Richard A. Pitts Elizaveta Kaveeva Xavier Bonnin David Coster Vladimir Rozhansky Ilya Senichenkov Irina Veselova Sergey Voskoboynikov Felix Reimold |
| author_sort | Elizaveta Sytova |
| collection | DOAJ |
| description | The study aims to estimate the influence of machine scale size on the behavior of plasma with extrinsic seeded impurities in the scrape-off layer (SOL) and divertor. This is performed through the comparison of plasma boundary simulations using the SOLPS-ITER code including drifts and currents of nitrogen (N) and neon (Ne) injection in ITER and ASDEX Upgrade (AUG) geometries. Trends are examined between the two seeding species in each individual device and by a comparison of the differences between the two machines. In the modeling results, the radiated power peak is located near the X-point in the inner divertor for the AUG cases and in the vicinity of the strike points in both divertors in ITER. The simulations also find less Ne impurity ions in the divertor volume than N and more significant Ne radiation inside the separatrix for AUG, consistent with published experimental findings. In ITER, both species radiate mostly from the divertor, in agreement with the existing SOLPS-4.3 simulation database obtained without drifts and with a less sophisticated treatment of parallel impurity transport. Drifts are important players in determining the plasma background for AUG and are comparatively less important in ITER. In both devices, the spatial distribution of the impurity ion density is complex, with their parallel flow patterns correlating with the thermal and friction force balance. Within this isolated modeling study, the principal reasons for different behavior between N and Ne on AUG and ITER appear to be the combination of a stronger drift effect and reduced screening of recycled fuel and impurity from divertor to private flux region on AUG leading to a more extended, colder plasma than in ITER. The increased temperature in the confined region just inside the separatrix on ITER also means that impurity ions reaching this zone are fully ionized and do not contribute significantly to the radiation loss there. On the basis of this study, both N and Ne are found to be acceptable low Z radiators on ITER. |
| first_indexed | 2024-12-21T17:35:37Z |
| format | Article |
| id | doaj.art-e5de0492a3864e2da04521cc515bdf7c |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-21T17:35:37Z |
| publishDate | 2019-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-e5de0492a3864e2da04521cc515bdf7c2022-12-21T18:55:46ZengElsevierNuclear Materials and Energy2352-17912019-05-01197278Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITERElizaveta Sytova0Richard A. Pitts1Elizaveta Kaveeva2Xavier Bonnin3David Coster4Vladimir Rozhansky5Ilya Senichenkov6Irina Veselova7Sergey Voskoboynikov8Felix Reimold9ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France; Max-Planck Institute for Plasma Physics, D-85748 Garching, Germany; Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia; Ghent University, Department of Applied physics, Ghent, Belgium; Aix-Marseille Universite, Ecole Doctorale Physique et Sciences de la Matiere, Marseille, France; Corresponding author.ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, FrancePeter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, RussiaITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, FranceMax-Planck Institute for Plasma Physics, D-85748 Garching, GermanyPeter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, RussiaPeter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, RussiaPeter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, RussiaPeter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, RussiaMax-Planck Institute for Plasma Physics, D-17491 Greifswald, GermanyThe study aims to estimate the influence of machine scale size on the behavior of plasma with extrinsic seeded impurities in the scrape-off layer (SOL) and divertor. This is performed through the comparison of plasma boundary simulations using the SOLPS-ITER code including drifts and currents of nitrogen (N) and neon (Ne) injection in ITER and ASDEX Upgrade (AUG) geometries. Trends are examined between the two seeding species in each individual device and by a comparison of the differences between the two machines. In the modeling results, the radiated power peak is located near the X-point in the inner divertor for the AUG cases and in the vicinity of the strike points in both divertors in ITER. The simulations also find less Ne impurity ions in the divertor volume than N and more significant Ne radiation inside the separatrix for AUG, consistent with published experimental findings. In ITER, both species radiate mostly from the divertor, in agreement with the existing SOLPS-4.3 simulation database obtained without drifts and with a less sophisticated treatment of parallel impurity transport. Drifts are important players in determining the plasma background for AUG and are comparatively less important in ITER. In both devices, the spatial distribution of the impurity ion density is complex, with their parallel flow patterns correlating with the thermal and friction force balance. Within this isolated modeling study, the principal reasons for different behavior between N and Ne on AUG and ITER appear to be the combination of a stronger drift effect and reduced screening of recycled fuel and impurity from divertor to private flux region on AUG leading to a more extended, colder plasma than in ITER. The increased temperature in the confined region just inside the separatrix on ITER also means that impurity ions reaching this zone are fully ionized and do not contribute significantly to the radiation loss there. On the basis of this study, both N and Ne are found to be acceptable low Z radiators on ITER.http://www.sciencedirect.com/science/article/pii/S2352179118303120 |
| spellingShingle | Elizaveta Sytova Richard A. Pitts Elizaveta Kaveeva Xavier Bonnin David Coster Vladimir Rozhansky Ilya Senichenkov Irina Veselova Sergey Voskoboynikov Felix Reimold Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITER Nuclear Materials and Energy |
| title | Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITER |
| title_full | Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITER |
| title_fullStr | Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITER |
| title_full_unstemmed | Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITER |
| title_short | Comparing N versus Ne as divertor radiators in ASDEX-upgrade and ITER |
| title_sort | comparing n versus ne as divertor radiators in asdex upgrade and iter |
| url | http://www.sciencedirect.com/science/article/pii/S2352179118303120 |
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