Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas

N. Bonanomi; P. Mantica; J. Citrin; C. Giroud; E. Lerche; C. Sozzi; D. Taylor; M. Tsalas; D. van Eester; Leena Aho-Mantila; Markus Airila; Antti Hakola; Aaro Järvinen; Juuso Karhunen; Seppo Koivuranta; Jari Likonen; Antti Salmi; Paula Sirén; Tuomas Tala; JET Contributors

doi:10.1088/1741-4326/aa9e7c

Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas

N. Bonanomi (Corresponding Author), P. Mantica, J. Citrin, C. Giroud, E. Lerche, C. Sozzi, D. Taylor, M. Tsalas, D. van Eester, Leena Aho-Mantila, Markus Airila, Antti Hakola, Aaro Järvinen, Juuso Karhunen, Seppo Koivuranta, Jari Likonen, Antti Salmi, Paula Sirén, Tuomas Tala, JET Contributors

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Abstract

A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on-and off-Axis in minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in and s/q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.

Original language	English
Article number	026028
Journal	Nuclear Fusion
Volume	58
Issue number	2
DOIs	https://doi.org/10.1088/1741-4326/aa9e7c
Publication status	Published - Feb 2018
MoE publication type	A1 Journal article-refereed

Funding

The authors would like to thank Emiliano Fable and Gary Staebler for precious suggestions and discussions on the use of the TGLF model. The authors are grateful to D.R. Mikkelsen for assistance. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE—AC02—05CH11231. A part of this work was carried out using the HELIOS supercomputer system at Computational Simulation Centre of International Fusion Energy Research Centre (IFERC—CSC), Aomori, Japan, under the Broader Approach collaboration between Euratom and Japan, implemented by Fusion for Energy and JAEA. We acknowledge the CINECA award under the ISCRA initiative, for the availability of high performance computing resources and support. 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.

Keywords

gyrokinetic simulations
light impurities in JET
nuclear fusion
quasilinear simulations
turbulent transport

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10.1088/1741-4326/aa9e7c

Cite this

Bonanomi, N., Mantica, P., Citrin, J., Giroud, C., Lerche, E., Sozzi, C., Taylor, D., Tsalas, M., van Eester, D., Aho-Mantila, L., Airila, M., Hakola, A., Järvinen, A., Karhunen, J., Koivuranta, S., Likonen, J., Salmi, A., Sirén, P., Tala, T., & JET Contributors (2018). Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas. Nuclear Fusion, 58(2), Article 026028. https://doi.org/10.1088/1741-4326/aa9e7c

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title = "Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas",

abstract = "A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on-and off-Axis in minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in and s/q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.",

keywords = "gyrokinetic simulations, light impurities in JET, nuclear fusion, quasilinear simulations, turbulent transport",

author = "N. Bonanomi and P. Mantica and J. Citrin and C. Giroud and E. Lerche and C. Sozzi and D. Taylor and M. Tsalas and {van Eester}, D. 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 Leena Aho-Mantila and N. Aiba and Markus Airila and R. Albanese and V. Aldred and D. Alegre and E. Alessi and P. Aleynikov and A. Alfer 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 Antti Hakola and Aaro J{\"a}rvinen and Juuso Karhunen and H.T. Kim and H.S. Kim and Seppo Koivuranta and A. Lahtinen and Jari Likonen and Y. Liu and T. Makkonen and H. Nordman and Antti Salmi and M.I.K. Santala and Paula Sir{\'e}n and Tuomas Tala and {JET Contributors}",

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Bonanomi, N, Mantica, P, Citrin, J, Giroud, C, Lerche, E, Sozzi, C, Taylor, D, Tsalas, M, van Eester, D, Aho-Mantila, L , Airila, M , Hakola, A , Järvinen, A , Karhunen, J, Koivuranta, S, Likonen, J , Salmi, A, Sirén, P, Tala, T & JET Contributors 2018, 'Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas', Nuclear Fusion, vol. 58, no. 2, 026028. https://doi.org/10.1088/1741-4326/aa9e7c

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T1 - Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas

AU - Bonanomi, N.

AU - Mantica, P.

AU - Citrin, J.

AU - Giroud, C.

AU - Lerche, E.

AU - Sozzi, C.

AU - Taylor, D.

AU - Tsalas, M.

AU - van Eester, D.

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, Leena

AU - Aiba, N.

AU - Airila, Markus

AU - Albanese, R.

AU - Aldred, V.

AU - Alegre, D.

AU - Alessi, E.

AU - Aleynikov, P.

AU - Alfer, 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 - Hakola, Antti

AU - Järvinen, Aaro

AU - Karhunen, Juuso

AU - Kim, H.T.

AU - Kim, H.S.

AU - Koivuranta, Seppo

AU - Lahtinen, A.

AU - Likonen, Jari

AU - Liu, Y.

AU - Makkonen, T.

AU - Nordman, H.

AU - Salmi, Antti

AU - Santala, M.I.K.

AU - Sirén, Paula

AU - Tala, Tuomas

AU - JET Contributors

PY - 2018/2

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N2 - A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on-and off-Axis in minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in and s/q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.

AB - A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on-and off-Axis in minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in and s/q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.

KW - gyrokinetic simulations

KW - light impurities in JET

KW - nuclear fusion

KW - quasilinear simulations

KW - turbulent transport

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U2 - 10.1088/1741-4326/aa9e7c

DO - 10.1088/1741-4326/aa9e7c

M3 - Article

AN - SCOPUS:85040646858

SN - 0029-5515

VL - 58

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 2

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ER -

Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas

Abstract

Funding

Keywords

UN SDGs

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