Overview of the JET results with the ITER-like wall

F. Romanelli , Wojciech Zabołotny

Abstract

Following the completion in May 2011 of the shutdown for the installation of the beryllium wall and the tungsten divertor, the first set of JET campaigns have addressed the investigation of the retention properties and the development of operational scenarios with the new plasma-facing materials. The large reduction in the carbon content (more than a factor ten) led to a much lower Zeff (1.2–1.4) during L- and H-mode plasmas, and radiation during the burn-through phase of the plasma initiation with the consequence that breakdown failures are almost absent. Gas balance experiments have shown that the fuel retention rate with the new wall is substantially reduced with respect to the C wall. The re-establishment of the baseline H-mode and hybrid scenarios compatible with the new wall has required an optimization of the control of metallic impurity sources and heat loads. Stable type-I ELMy H-mode regimes with H98,y2 close to 1 and βN ~ 1.6 have been achieved using gas injection. ELM frequency is a key factor for the control of the metallic impurity accumulation. Pedestal temperatures tend to be lower with the new wall, leading to reduced confinement, but nitrogen seeding restores high pedestal temperatures and confinement. Compared with the carbon wall, major disruptions with the new wall show a lower radiated power and a slower current quench. The higher heat loads on Be wall plasma-facing components due to lower radiation made the routine use of massive gas injection for disruption mitigation essential.
Collective authorJET EFDA Contributors
Author F. Romanelli - [Associazione EURATOM-ENEA sulla Fusione]
F. Romanelli,,
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, Wojciech Zabołotny (FEIT / PE)
Wojciech Zabołotny,,
- The Institute of Electronic Systems
Journal seriesNuclear Fusion, ISSN 0029-5515, e-ISSN 1741-4326
Issue year2013
Vol53
No10
Pages1-20
Publication size in sheets5200.1
ASJC Classification3104 Condensed Matter Physics; 3106 Nuclear and High Energy Physics
DOIDOI:10.1088/0029-5515/53/10/104002
URL https://iopscience.iop.org/article/10.1088/0029-5515/53/10/104002
Languageen angielski
Score (nominal)45
Score sourcejournalList
ScoreMinisterial score = 40.0, 12-05-2020, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 12-05-2020, ArticleFromJournal
Publication indicators GS Citations = 112.0; Scopus Citations = 81; WoS Citations = 120; Scopus SNIP (Source Normalised Impact per Paper): 2014 = 1.476; WoS Impact Factor: 2013 = 3.243 (2) - 2013=3.237 (5)
Citation count*123 (2020-09-26)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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