The quasi-continuous exhaust regime in JET
The quasi-continuous exhaust (QCE) regime is a regime that is naturally type-I ELM-free. It combines the high density at the plasma edge needed for power exhaust with the high normalised energy confinement typical for H-mode operation. In the QCE regime large-scale ELMs are avoided and high-frequenc...
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| 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/adaa86 |
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| author | M. Faitsch M. Dunne E. Lerche P. Lomas I. Balboa P. Bilkova P. Bohm A. Kappatou D. Kos B. Labit S. Menmuir O. Sauter S. Silburn E.R. Solano H.J. Sun A. Tookey E. Viezzer U. Stroth JET Contributors the EUROfusion Tokamak Exploitation Team |
| author_facet | M. Faitsch M. Dunne E. Lerche P. Lomas I. Balboa P. Bilkova P. Bohm A. Kappatou D. Kos B. Labit S. Menmuir O. Sauter S. Silburn E.R. Solano H.J. Sun A. Tookey E. Viezzer U. Stroth JET Contributors the EUROfusion Tokamak Exploitation Team |
| author_sort | M. Faitsch |
| collection | DOAJ |
| description | The quasi-continuous exhaust (QCE) regime is a regime that is naturally type-I ELM-free. It combines the high density at the plasma edge needed for power exhaust with the high normalised energy confinement typical for H-mode operation. In the QCE regime large-scale ELMs are avoided and high-frequency, low-amplitude filaments are present leading to the name-giving quasi-continuous edge transport of particles and energy. This contribution reports that for the first time the QCE regime was successfully achieved in JET with a metal wall. Moreover, it was demonstrated in the recent JET deuterium-tritium campaign DTE3 that the regime is compatible with D–T operation. Porting the QCE regime to JET strongly benefited from the experimental and modelling efforts at the medium sized tokamaks ASDEX Upgrade and TCV. Using the physics picture developed from the ASDEX Upgrade experimental results, the route to the QCE regime in JET reported here is following closely the approach that was successful in ASDEX Upgrade. First, strong plasma shaping—large elongation and triangularity and the highly correlated closeness to double null—is developed. Second, sufficient fuelling to achieve high enough density at the pedestal foot, close to the separatrix, is applied. In addition, neon seeding proved to be very beneficial to avoid type-I ELMs when reducing the main ion fuelling. |
| format | Article |
| id | doaj-art-612f06ae64444341a99bccd48f1d63e5 |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-612f06ae64444341a99bccd48f1d63e52025-01-22T15:16:37ZengIOP PublishingNuclear Fusion0029-55152025-01-0165202400310.1088/1741-4326/adaa86The quasi-continuous exhaust regime in JETM. Faitsch0https://orcid.org/0000-0002-9809-7490M. Dunne1https://orcid.org/0000-0002-5259-9970E. Lerche2P. Lomas3I. Balboa4https://orcid.org/0000-0002-5665-2222P. Bilkova5https://orcid.org/0000-0002-6156-9773P. Bohm6https://orcid.org/0000-0003-2590-4420A. Kappatou7https://orcid.org/0000-0003-3341-1909D. Kos8https://orcid.org/0000-0002-9550-4329B. Labit9https://orcid.org/0000-0002-0751-8182S. Menmuir10O. Sauter11https://orcid.org/0000-0002-0099-6675S. Silburn12https://orcid.org/0000-0002-3111-5113E.R. Solano13https://orcid.org/0000-0002-4815-3407H.J. Sun14https://orcid.org/0000-0003-0880-0013A. Tookey15https://orcid.org/0009-0009-6089-7634E. Viezzer16https://orcid.org/0000-0001-6419-6848U. Stroth17https://orcid.org/0000-0003-1104-2233JET Contributorsthe EUROfusion Tokamak Exploitation TeamMax-Planck-Institute for Plasma Physics , Boltzmannstr. 2, D-85748 Garching, GermanyMax-Planck-Institute for Plasma Physics , Boltzmannstr. 2, D-85748 Garching, GermanyLaboratory for Plasma Physics LPP-ERM/KMS , B-1000 Brussels, Belgium; United Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandUnited Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandUnited Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandInstitute of Plasma Physics of the CAS , Prague, Czech RepublicInstitute of Plasma Physics of the CAS , Prague, Czech RepublicMax-Planck-Institute for Plasma Physics , Boltzmannstr. 2, D-85748 Garching, GermanyUnited Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandEcole Polytechnique Federale de Lausanne, Swiss Plasma Center , CH-1015 Lausanne, SwitzerlandUnited Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandEcole Polytechnique Federale de Lausanne, Swiss Plasma Center , CH-1015 Lausanne, SwitzerlandUnited Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandLaboratorio Nacional de Fusión, CIEMAT , Madrid, SpainUnited Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandUnited Kingdom Atomic Energy Authority, Culham Science Centre , Abingdon, Oxon OX14 3DB, United Kingdom of Great Britain and Northern IrelandDepartment of Atomic, Molecular and Nuclear Physics, University of Seville , Seville, SpainMax-Planck-Institute for Plasma Physics , Boltzmannstr. 2, D-85748 Garching, Germany; Physik Department E28, Technische Universität München , 85748 Garching, GermanyThe quasi-continuous exhaust (QCE) regime is a regime that is naturally type-I ELM-free. It combines the high density at the plasma edge needed for power exhaust with the high normalised energy confinement typical for H-mode operation. In the QCE regime large-scale ELMs are avoided and high-frequency, low-amplitude filaments are present leading to the name-giving quasi-continuous edge transport of particles and energy. This contribution reports that for the first time the QCE regime was successfully achieved in JET with a metal wall. Moreover, it was demonstrated in the recent JET deuterium-tritium campaign DTE3 that the regime is compatible with D–T operation. Porting the QCE regime to JET strongly benefited from the experimental and modelling efforts at the medium sized tokamaks ASDEX Upgrade and TCV. Using the physics picture developed from the ASDEX Upgrade experimental results, the route to the QCE regime in JET reported here is following closely the approach that was successful in ASDEX Upgrade. First, strong plasma shaping—large elongation and triangularity and the highly correlated closeness to double null—is developed. Second, sufficient fuelling to achieve high enough density at the pedestal foot, close to the separatrix, is applied. In addition, neon seeding proved to be very beneficial to avoid type-I ELMs when reducing the main ion fuelling.https://doi.org/10.1088/1741-4326/adaa86power exhaustELM-freequasi-continuous exhaustdeuterium-tritiumplasma edge |
| spellingShingle | M. Faitsch M. Dunne E. Lerche P. Lomas I. Balboa P. Bilkova P. Bohm A. Kappatou D. Kos B. Labit S. Menmuir O. Sauter S. Silburn E.R. Solano H.J. Sun A. Tookey E. Viezzer U. Stroth JET Contributors the EUROfusion Tokamak Exploitation Team The quasi-continuous exhaust regime in JET Nuclear Fusion power exhaust ELM-free quasi-continuous exhaust deuterium-tritium plasma edge |
| title | The quasi-continuous exhaust regime in JET |
| title_full | The quasi-continuous exhaust regime in JET |
| title_fullStr | The quasi-continuous exhaust regime in JET |
| title_full_unstemmed | The quasi-continuous exhaust regime in JET |
| title_short | The quasi-continuous exhaust regime in JET |
| title_sort | quasi continuous exhaust regime in jet |
| topic | power exhaust ELM-free quasi-continuous exhaust deuterium-tritium plasma edge |
| url | https://doi.org/10.1088/1741-4326/adaa86 |
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