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| 001 | 852579 | ||
| 005 | 20240711113529.0 | ||
| 024 | 7 | _ | |a 10.1016/j.fusengdes.2017.04.016 |2 doi |
| 024 | 7 | _ | |a 0920-3796 |2 ISSN |
| 024 | 7 | _ | |a 1873-7196 |2 ISSN |
| 024 | 7 | _ | |a 2128/19732 |2 Handle |
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| 037 | _ | _ | |a FZJ-2018-05491 |
| 082 | _ | _ | |a 620 |
| 100 | 1 | _ | |a Zammuto, I. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Implementation of ferritic steel as in vessel wall: Lessons learnt and follow up |
| 260 | _ | _ | |a New York, NY [u.a.] |c 2017 |b Elsevier |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a ASDEX Upgrade (AUG) is the only tokamak in Europe to have low activation ferritic steel as the inner vessel wall facing component. Together with the massive tungsten tiles in the lower divertor, AUG is the tokamak with the closest DEMO wall. The project is a first step towards the extensive use of ferritic steel in future fusion reactors. For example, the test blanket module of ITER is planned to have a ferritic steel wall and thick tungsten tiles as a plasma facing component.The ‘ad hoc’ ferritic steel built with low activation capability is known as Eurofer. As the low activation property is not a requirement for AUG, the material selected for the project is the martensitic steel P92 which is the most similar material to Eurofer from a magnetic point of view. The purpose of the project is to improve understanding of the magnetic perturbation of the ferritic steel both on the plasma and magnetic probes, evaluating and controlling these effects. Additionally, the effect of the additional forces on the supporting structure has been addressed.Bearing this in mind, in 2013 a step wise program has been started and part of the W coated graphite tiles in the region of the inner column were replaced by steel tiles [1]. The first campaign did not suffer any particular issue related to the new material. According to the calculations, the plasma was almost unperturbed, thanks also to the toroidal symmetry of the tiles inside the vessel, and the magnetic probe measurements were properly corrected [2].Inspection of the machine pointed out some hardware problems. The graphite tiles adjacent to the steel tiles were damaged. The graphite tiles had broken edges in 5 from 64 positions and notches in many others. The coating of the graphite and steel tiles, made of tungsten and TiO respectively, was damaged. At first glance it was clear that the steel tiles were moving but it was definitely unexpected. In understanding the process, the location of the damage was the crucial hint. In fact all failures were located at the boundary between 2 vacuum vessel octants. To justify this failure mode inside the vessel, a hypothesis (about current flowing in the heat shield supporting structure) was made and FEM analyses were carried out in this direction. With extreme caution, in 2015 just one additional row of steel tiles was added together with diagnostics that confirmed the hypothesis. Now that a clear understanding of the problem has been reached, the project to add further rows of steel tiles can be continued. For the next campaign it is planned to replace all the tiles in the middle region of the heat shield together with stiffening and modification of the supporting structure.In this paper the learning process from the damage of the tiles and its causes, from the FEM analysis results to the data diagnostics will be reported. The future plans for steel tiles in AUG will be discussed. |
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| 700 | 1 | _ | |a Giannone, L. |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Herrmann, A. |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a Houben, A. |0 P:(DE-Juel1)157772 |b 3 |
| 700 | 1 | _ | |a Kallenbach, A. |0 P:(DE-HGF)0 |b 4 |
| 700 | 1 | _ | |a Schuhbeck, K. H. |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Sieglin, B. |0 P:(DE-HGF)0 |b 6 |
| 700 | 1 | _ | |a Vorbrugg, S. |0 P:(DE-HGF)0 |b 7 |
| 773 | _ | _ | |a 10.1016/j.fusengdes.2017.04.016 |g Vol. 124, p. 297 - 301 |0 PERI:(DE-600)1492280-0 |p 297 - 301 |t Fusion engineering and design |v 124 |y 2017 |x 0920-3796 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/852579/files/1-s2.0-S0920379617304118-main-1.pdf |y Restricted |
| 856 | 4 | _ | |y Published on 2017-04-23. Available in OpenAccess from 2019-04-23. |u https://juser.fz-juelich.de/record/852579/files/Zammuto_Implementation.pdf |
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