Inter-ELM evolution of the edge current density in JET-ILW type i ELMy H-mode plasmas

JET Contributors

doi:10.1088/1361-6587/aac7a9

Inter-ELM evolution of the edge current density in JET-ILW type i ELMy H-mode plasmas

JET Contributors

University of York
United Kingdom Atomic Energy Authority
KTH Royal Institute of Technology
Max Planck Institute for Plasma Physics
Culham Science Centre
Jülich Research Centre
Institute for Plasma Research
University of Lisbon
Queen's University Belfast
University of Helsinki
Commissariat à l’énergie atomique et aux énergies alternatives
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
ITER
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
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
CIEMAT
University of Oxford
EUROfusion Programme Management Unit
Oak Ridge National Laboratory
Karlsruhe 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
Institute of Plasma Physics and Laser Microfusion
Dutch Institute for Fundamental Energy Research
National Institute for Laser, Plasma and Radiation Physics
Ghent University
Jožef Stefan Institute
UMR 7198
CAS - Institute of Plasma Physics
University of California at San Diego
RAS - Ioffe Physico Technical Institute
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
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
TU Wien
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

7 Scopus citations

Abstract

Recent studies (Maggi et al 2015 Nucl. Fusion 55 113031; Maggi et al 2017 Nucl. Fusion 57 116012) have shown that on JET with the Be/W ITER-like wall (JET-ILW) in high β discharges with high D₂ gas rates, the inter-ELM temperature pedestal growth is saturated half way through the ELM cycle, leading to plasmas with reduced confinement, and that the linear MHD stability of these pedestals is inconsistent with the peeling-ballooning paradigm (Snyder et al 2002 Phys. Plasmas 9 2037-43; Wilson et al 2002 Phys. Plasmas 9 1277-86). In this paper, the inter-ELM evolution of the edge current density is investigated in a wide range of type I ELMy H-modes on JET-ILW. It is found that in discharges at a low gas rate, the peak edge bootstrap current continuously increases until the ELM crashes, while it saturates during the ELM cycle at high gas rates. The effect of current diffusion on the build-up of the edge current inter-ELM is assessed by simulating the Ohmic current contribution with the JETTO transport code. The simulations indicate that current diffusion contributes little to the time evolution of the total edge current in the second half of the ELM cycle and the total current is dominated by the bootstrap current. Therefore, current diffusion does not explain why JET-ILW type I ELMy pedestals at a high gas rate and high β _N are found to be stable to peeling-ballooning modes.

Original language	English
Article number	085003
Journal	Plasma Physics and Controlled Fusion
Volume	60
Issue number	8
DOIs	https://doi.org/10.1088/1361-6587/aac7a9
State	Published - 13 Jun 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 York Plasma Institute.

Funding

The authors would like to thank J Hobirk, I Lupelli, T Osborne, E Solano and G Szepesi for fruitful discussions. The authors are grateful to E Belli and J Candy for providing access to the NEO code. This work was supported by the Engineering and Physical Sciences Research Council (EP/ L01663X/1). 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. 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
Engineering and Physical Sciences Research Council	EP/ L01663X/1

Keywords

ELMs
H-mode
JET-ILW
bootstrap current
current diffusion
edge current
pedestal

Access to Document

10.1088/1361-6587/aac7a9

Cite this

@article{4280a410d0c544ecb3ac93c4fb93647f,

title = "Inter-ELM evolution of the edge current density in JET-ILW type i ELMy H-mode plasmas",

abstract = "Recent studies (Maggi et al 2015 Nucl. Fusion 55 113031; Maggi et al 2017 Nucl. Fusion 57 116012) have shown that on JET with the Be/W ITER-like wall (JET-ILW) in high β discharges with high D2 gas rates, the inter-ELM temperature pedestal growth is saturated half way through the ELM cycle, leading to plasmas with reduced confinement, and that the linear MHD stability of these pedestals is inconsistent with the peeling-ballooning paradigm (Snyder et al 2002 Phys. Plasmas 9 2037-43; Wilson et al 2002 Phys. Plasmas 9 1277-86). In this paper, the inter-ELM evolution of the edge current density is investigated in a wide range of type I ELMy H-modes on JET-ILW. It is found that in discharges at a low gas rate, the peak edge bootstrap current continuously increases until the ELM crashes, while it saturates during the ELM cycle at high gas rates. The effect of current diffusion on the build-up of the edge current inter-ELM is assessed by simulating the Ohmic current contribution with the JETTO transport code. The simulations indicate that current diffusion contributes little to the time evolution of the total edge current in the second half of the ELM cycle and the total current is dominated by the bootstrap current. Therefore, current diffusion does not explain why JET-ILW type I ELMy pedestals at a high gas rate and high β N are found to be stable to peeling-ballooning modes.",

keywords = "ELMs, H-mode, JET-ILW, bootstrap current, current diffusion, edge current, pedestal",

author = "\{JET Contributors\} and L. Horvath and Maggi, \{C. F.\} and Casson, \{F. J.\} and V. Parail and L. Frassinetti and F. Koechl and S. Saarelma and Dunne, \{M. G.\} and Gibson, \{K. J.\} 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 O. Asunta and F. Auriemma and D. Borodin",

note = "Publisher Copyright: {\textcopyright} 2018 York Plasma Institute.",

year = "2018",

month = jun,

day = "13",

doi = "10.1088/1361-6587/aac7a9",

language = "אנגלית",

volume = "60",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "8",

}

TY - JOUR

T1 - Inter-ELM evolution of the edge current density in JET-ILW type i ELMy H-mode plasmas

AU - JET Contributors

AU - Horvath, L.

AU - Maggi, C. F.

AU - Casson, F. J.

AU - Parail, V.

AU - Frassinetti, L.

AU - Koechl, F.

AU - Saarelma, S.

AU - Dunne, M. G.

AU - Gibson, K. J.

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 - Asunta, O.

AU - Auriemma, F.

AU - Borodin, D.

PY - 2018/6/13

Y1 - 2018/6/13

N2 - Recent studies (Maggi et al 2015 Nucl. Fusion 55 113031; Maggi et al 2017 Nucl. Fusion 57 116012) have shown that on JET with the Be/W ITER-like wall (JET-ILW) in high β discharges with high D2 gas rates, the inter-ELM temperature pedestal growth is saturated half way through the ELM cycle, leading to plasmas with reduced confinement, and that the linear MHD stability of these pedestals is inconsistent with the peeling-ballooning paradigm (Snyder et al 2002 Phys. Plasmas 9 2037-43; Wilson et al 2002 Phys. Plasmas 9 1277-86). In this paper, the inter-ELM evolution of the edge current density is investigated in a wide range of type I ELMy H-modes on JET-ILW. It is found that in discharges at a low gas rate, the peak edge bootstrap current continuously increases until the ELM crashes, while it saturates during the ELM cycle at high gas rates. The effect of current diffusion on the build-up of the edge current inter-ELM is assessed by simulating the Ohmic current contribution with the JETTO transport code. The simulations indicate that current diffusion contributes little to the time evolution of the total edge current in the second half of the ELM cycle and the total current is dominated by the bootstrap current. Therefore, current diffusion does not explain why JET-ILW type I ELMy pedestals at a high gas rate and high β N are found to be stable to peeling-ballooning modes.

AB - Recent studies (Maggi et al 2015 Nucl. Fusion 55 113031; Maggi et al 2017 Nucl. Fusion 57 116012) have shown that on JET with the Be/W ITER-like wall (JET-ILW) in high β discharges with high D2 gas rates, the inter-ELM temperature pedestal growth is saturated half way through the ELM cycle, leading to plasmas with reduced confinement, and that the linear MHD stability of these pedestals is inconsistent with the peeling-ballooning paradigm (Snyder et al 2002 Phys. Plasmas 9 2037-43; Wilson et al 2002 Phys. Plasmas 9 1277-86). In this paper, the inter-ELM evolution of the edge current density is investigated in a wide range of type I ELMy H-modes on JET-ILW. It is found that in discharges at a low gas rate, the peak edge bootstrap current continuously increases until the ELM crashes, while it saturates during the ELM cycle at high gas rates. The effect of current diffusion on the build-up of the edge current inter-ELM is assessed by simulating the Ohmic current contribution with the JETTO transport code. The simulations indicate that current diffusion contributes little to the time evolution of the total edge current in the second half of the ELM cycle and the total current is dominated by the bootstrap current. Therefore, current diffusion does not explain why JET-ILW type I ELMy pedestals at a high gas rate and high β N are found to be stable to peeling-ballooning modes.

KW - ELMs

KW - H-mode

KW - JET-ILW

KW - bootstrap current

KW - current diffusion

KW - edge current

KW - pedestal

UR - https://www.scopus.com/pages/publications/85050391677

U2 - 10.1088/1361-6587/aac7a9

DO - 10.1088/1361-6587/aac7a9

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

AN - SCOPUS:85050391677

SN - 0741-3335

VL - 60

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 8

M1 - 085003

ER -

Inter-ELM evolution of the edge current density in JET-ILW type i ELMy H-mode plasmas

Abstract

Bibliographical note

Funding

Keywords

Access to Document

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