W transport and accumulation control in the termination phase of JET H-mode discharges and implications for ITER

JET Contributors

doi:10.1088/1361-6587/aabf52

W transport and accumulation control in the termination phase of JET H-mode discharges and implications for ITER

JET Contributors

United Kingdom Atomic Energy Authority
Austrian Academy of Sciences
TU Wien
ITER
CIEMAT
University of Lisbon
Commissariat à l’énergie atomique et aux énergies alternatives
Culham Science Centre
Jülich Research Centre
Institute for Plasma Research
Queen's University Belfast
University of Helsinki
VTT Technical Research Centre of Finland Ltd.
National Institutes for Quantum Science and Technology
University of Naples Federico II
National Distance Education University
National Research Council of Italy
Russian Research Centre Kurchatov Institute
University of Naples Parthenope
Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile
Troitsk Institute for Innovation and Fusion Research
Uppsala University
The National Institute for Cryogenics and Isotopic Technology
Max Planck Institute for Plasma Physics
University of Catania
Fusion for Energy
National Institutes of Natural Sciences - National Institute for Fusion Science
Massachusetts Institute of Technology
Aalto University
University of Latvia
Imperial College London
University of Oxford
EUROfusion Programme Management Unit
Oak Ridge National Laboratory
Karlsruhe Institute of Technology
University of York
KTH Royal Institute of Technology
Maritime University Of Szczecin
Institute of Nuclear Physics PAN
Czech Academy of Sciences
University of Trento
Swiss Federal Institute of Technology Lausanne
Wigner Research Centre for Physics
Comenius University
Lviv Polytechnic National University
University of Milan - Bicocca
The National Institute for Optoelectronics
Fourth State Research
University of Texas at Austin
Belgian Nuclear Research Center
National Centre for Nuclear Research
Princeton Plasma Physics Laboratory
Physique des Interactions Ioniques et Moléculaires
University of Cagliari
University of Warwick
Andrzej Soltan Institute for Nuclear Studies
Dutch Institute for Fundamental Energy Research
National Institute for Laser, Plasma and Radiation Physics
Ghent University
Jožef Stefan Institute
Université de Lorraine
CAS - Institute of Plasma Physics
University of California at San Diego
Royal Military Academy
Horia Hulubei National Institute of Physics and Nuclear Engineering
Chalmers University of Technology
European Commission
Technical University of Madrid
University of Campania Luigi Vanvitelli
Warsaw University of Technology
University of Basilicata
Barcelona Supercomputing Center (BSC)
Aix Marseille Université
University of Seville
Centro Brasileiro de Pesquisas Físicas
Aix-Marseille Université
University of Rome Tor Vergata
RAS - Ioffe Physico Technical Institute
General Atomics
University of Innsbruck
University of Toyama
University of Strathclyde
National Technical University of Athens
Tuscia University
Technical University of Denmark
Korea Advanced Institute of Science and Technology
Seoul National University
University College Cork
University of Opole
Daegu University
National Fusion Research Institute
Dublin City University
PELIN LLC
Arizona State University
Complutense University
University of Basel
Universidad Carlos III de Madrid
Consorzio CREATE
Demokritos National Centre for Scientific Research
Purdue University
ULB-Campus Plaine
University of California
Universidade de São Paulo
Lithuanian Energy Institute
HRS Fusion
Polytechnic University of Turin
University of Cassino and Southern Lazio
University of Electronic Science and Technology of China

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

Tokamak operation with W PFCs is associated with specific challenges for impurity control, which may be particularly demanding in the transition from stationary H-mode to L-mode. To address W control issues in this phase, dedicated experiments have been performed at JET including the variation of the decrease of the power and current, gas fuelling and central ion cyclotron heating (ICRH), and applying active ELM control by vertical kicks. The experimental results obtained demonstrate the key role of maintaining ELM control to control the W concentration in the exit phase of H-modes with slow (ITER-like) ramp-down of the neutral beam injection power in JET. For these experiments, integrated fully predictive core+edge+SOL transport modelling studies applying discrete models for the description of transients such as sawteeth and ELMs have been performed for the first time with the JINTRAC suite of codes for the entire transition from stationary H-mode until the time when the plasma would return to L-mode focusing on the W transport behaviour. Simulations have shown that the existing models can appropriately reproduce the plasma profile evolution in the core, edge and SOL as well as W accumulation trends in the termination phase of JET H-mode discharges as function of the applied ICRH and ELM control schemes, substantiating the ambivalent effect of ELMs on W sputtering on one side and on edge transport affecting core W accumulation on the other side. The sensitivity with respect to NB particle and momentum sources has also been analysed and their impact on neoclassical W transport has been found to be crucial to reproduce the observed W accumulation characteristics in JET discharges. In this paper the results of the JET experiments, the comparison with JINTRAC modelling and the adequacy of the models to reproduce the experimental results are described and conclusions are drawn regarding the applicability of these models for the extrapolation of the applied W accumulation control techniques to ITER.

Original language	English
Article number	074008
Journal	Plasma Physics and Controlled Fusion
Volume	60
Issue number	7
DOIs	https://doi.org/10.1088/1361-6587/aabf52
State	Published - 5 Jun 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 IOP Publishing Ltd.

Funding

ITER is the Nuclear Facility INB no. 174. The views and opinions expressed herein do not necessarily reflect those of the ITER Organisation. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053 and from the RCUK Energy Programme [grant number EP/P012450/1]. To obtain further information on the data and models underlying this paper please contact [email protected]. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funders	Funder number
Euratom research and training programme 2014–2018
Horizon 2020 Framework Programme	633053
Research Councils UK	EP/P012450/1

Keywords

H-mode termination
ITER
JET
W transport
integrated modeling

Access to Document

10.1088/1361-6587/aabf52

Cite this

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title = "W transport and accumulation control in the termination phase of JET H-mode discharges and implications for ITER",

abstract = "Tokamak operation with W PFCs is associated with specific challenges for impurity control, which may be particularly demanding in the transition from stationary H-mode to L-mode. To address W control issues in this phase, dedicated experiments have been performed at JET including the variation of the decrease of the power and current, gas fuelling and central ion cyclotron heating (ICRH), and applying active ELM control by vertical kicks. The experimental results obtained demonstrate the key role of maintaining ELM control to control the W concentration in the exit phase of H-modes with slow (ITER-like) ramp-down of the neutral beam injection power in JET. For these experiments, integrated fully predictive core+edge+SOL transport modelling studies applying discrete models for the description of transients such as sawteeth and ELMs have been performed for the first time with the JINTRAC suite of codes for the entire transition from stationary H-mode until the time when the plasma would return to L-mode focusing on the W transport behaviour. Simulations have shown that the existing models can appropriately reproduce the plasma profile evolution in the core, edge and SOL as well as W accumulation trends in the termination phase of JET H-mode discharges as function of the applied ICRH and ELM control schemes, substantiating the ambivalent effect of ELMs on W sputtering on one side and on edge transport affecting core W accumulation on the other side. The sensitivity with respect to NB particle and momentum sources has also been analysed and their impact on neoclassical W transport has been found to be crucial to reproduce the observed W accumulation characteristics in JET discharges. In this paper the results of the JET experiments, the comparison with JINTRAC modelling and the adequacy of the models to reproduce the experimental results are described and conclusions are drawn regarding the applicability of these models for the extrapolation of the applied W accumulation control techniques to ITER.",

keywords = "H-mode termination, ITER, JET, W transport, integrated modeling",

author = "\{JET Contributors\} and F. K{\"o}chl and A. Loarte and \{de la Luna\}, E. and V. Parail and G. Corrigan and D. Harting and I. Nunes and C. Reux and Rimini, \{F. G.\} and A. Polevoi and M. Romanelli and X. Litaudon and S. Abduallev and M. Abhangi and P. Abreu and M. Afzal and Aggarwal, \{K. M.\} and T. Ahlgren and Ahn, \{J. H.\} and L. Aho-Mantila and N. Aiba and M. Airila and R. Albanese and V. Aldred and D. Alegre and E. Alessi and P. Aleynikov and A. Alfier and A. Alkseev and M. Allinson and B. Alper and E. Alves and G. Ambrosino and R. Ambrosino and L. Amicucci and V. Amosov and Sund{\'e}n, \{E. Andersson\} and M. Angelone and M. Anghel and C. Angioni and L. Appel and C. Appelbee and P. Arena and M. Ariola and H. Arnichand and S. Arshad and A. Ash and N. Ashikawa and V. Aslanyan and D. Borodin",

note = "Publisher Copyright: {\textcopyright} 2018 IOP Publishing Ltd.",

year = "2018",

month = jun,

day = "5",

doi = "10.1088/1361-6587/aabf52",

language = "אנגלית",

volume = "60",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

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TY - JOUR

T1 - W transport and accumulation control in the termination phase of JET H-mode discharges and implications for ITER

AU - JET Contributors

AU - Köchl, F.

AU - Loarte, A.

AU - de la Luna, E.

AU - Parail, V.

AU - Corrigan, G.

AU - Harting, D.

AU - Nunes, I.

AU - Reux, C.

AU - Rimini, F. G.

AU - Polevoi, A.

AU - Romanelli, M.

AU - Litaudon, X.

AU - Abduallev, S.

AU - Abhangi, M.

AU - Abreu, P.

AU - Afzal, M.

AU - Aggarwal, K. M.

AU - Ahlgren, T.

AU - Ahn, J. H.

AU - Aho-Mantila, L.

AU - Aiba, N.

AU - Airila, M.

AU - Albanese, R.

AU - Aldred, V.

AU - Alegre, D.

AU - Alessi, E.

AU - Aleynikov, P.

AU - Alfier, A.

AU - Alkseev, A.

AU - Allinson, M.

AU - Alper, B.

AU - Alves, E.

AU - Ambrosino, G.

AU - Ambrosino, R.

AU - Amicucci, L.

AU - Amosov, V.

AU - Sundén, E. Andersson

AU - Angelone, M.

AU - Anghel, M.

AU - Angioni, C.

AU - Appel, L.

AU - Appelbee, C.

AU - Arena, P.

AU - Ariola, M.

AU - Arnichand, H.

AU - Arshad, S.

AU - Ash, A.

AU - Ashikawa, N.

AU - Aslanyan, V.

AU - Borodin, D.

PY - 2018/6/5

Y1 - 2018/6/5

N2 - Tokamak operation with W PFCs is associated with specific challenges for impurity control, which may be particularly demanding in the transition from stationary H-mode to L-mode. To address W control issues in this phase, dedicated experiments have been performed at JET including the variation of the decrease of the power and current, gas fuelling and central ion cyclotron heating (ICRH), and applying active ELM control by vertical kicks. The experimental results obtained demonstrate the key role of maintaining ELM control to control the W concentration in the exit phase of H-modes with slow (ITER-like) ramp-down of the neutral beam injection power in JET. For these experiments, integrated fully predictive core+edge+SOL transport modelling studies applying discrete models for the description of transients such as sawteeth and ELMs have been performed for the first time with the JINTRAC suite of codes for the entire transition from stationary H-mode until the time when the plasma would return to L-mode focusing on the W transport behaviour. Simulations have shown that the existing models can appropriately reproduce the plasma profile evolution in the core, edge and SOL as well as W accumulation trends in the termination phase of JET H-mode discharges as function of the applied ICRH and ELM control schemes, substantiating the ambivalent effect of ELMs on W sputtering on one side and on edge transport affecting core W accumulation on the other side. The sensitivity with respect to NB particle and momentum sources has also been analysed and their impact on neoclassical W transport has been found to be crucial to reproduce the observed W accumulation characteristics in JET discharges. In this paper the results of the JET experiments, the comparison with JINTRAC modelling and the adequacy of the models to reproduce the experimental results are described and conclusions are drawn regarding the applicability of these models for the extrapolation of the applied W accumulation control techniques to ITER.

AB - Tokamak operation with W PFCs is associated with specific challenges for impurity control, which may be particularly demanding in the transition from stationary H-mode to L-mode. To address W control issues in this phase, dedicated experiments have been performed at JET including the variation of the decrease of the power and current, gas fuelling and central ion cyclotron heating (ICRH), and applying active ELM control by vertical kicks. The experimental results obtained demonstrate the key role of maintaining ELM control to control the W concentration in the exit phase of H-modes with slow (ITER-like) ramp-down of the neutral beam injection power in JET. For these experiments, integrated fully predictive core+edge+SOL transport modelling studies applying discrete models for the description of transients such as sawteeth and ELMs have been performed for the first time with the JINTRAC suite of codes for the entire transition from stationary H-mode until the time when the plasma would return to L-mode focusing on the W transport behaviour. Simulations have shown that the existing models can appropriately reproduce the plasma profile evolution in the core, edge and SOL as well as W accumulation trends in the termination phase of JET H-mode discharges as function of the applied ICRH and ELM control schemes, substantiating the ambivalent effect of ELMs on W sputtering on one side and on edge transport affecting core W accumulation on the other side. The sensitivity with respect to NB particle and momentum sources has also been analysed and their impact on neoclassical W transport has been found to be crucial to reproduce the observed W accumulation characteristics in JET discharges. In this paper the results of the JET experiments, the comparison with JINTRAC modelling and the adequacy of the models to reproduce the experimental results are described and conclusions are drawn regarding the applicability of these models for the extrapolation of the applied W accumulation control techniques to ITER.

KW - H-mode termination

KW - ITER

KW - JET

KW - W transport

KW - integrated modeling

UR - https://www.scopus.com/pages/publications/85048537842

U2 - 10.1088/1361-6587/aabf52

DO - 10.1088/1361-6587/aabf52

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85048537842

SN - 0741-3335

VL - 60

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 7

M1 - 074008

ER -

W transport and accumulation control in the termination phase of JET H-mode discharges and implications for ITER

Abstract

Bibliographical note

Funding

Keywords

Access to Document

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