First scenario development with the JET new ITER-like wall

E. Joffrin, M. Baruzzo, M.N.A. Beurskens, C. Bourdelle, S. Brezinsek, J. Bucalossi, P. Buratti, G. Calabro, C. D. Challis, M. Clever, J. Coenen, E. Delabie, R. Dux, P. Lomas, E. de la Luna, P. de Vries, J. Flanagan, L. Frassinetti, D. Frigione, C. Giroud & 19 others M. Groth, N. Hawkes, J. Hobirk, M. Lehnen, G. Maddison, J. Mailloux, C. F. Maggi, G. Matthews, M. Mayoral, A. Meigs, R. Neu, I. Nunes, T. Puetterich, F. Rimini, M. Sertoli, B. Sieglin, A.C.C. Sips, G.J. van Rooij, I. Voitsekhovitch

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Abstract

In the recent JET experimental campaigns with the new ITER-like wall (JET-ILW), major progress has been achieved in the characterization and operation of the H-mode regime in metallic environments: (i) plasma breakdown has been achieved at the first attempt and X-point L-mode operation recovered in a few days of operation; (ii) stationary and stable type-I ELMy H-modes with βN ~ 1.4 have been achieved in low and high triangularity ITER-like shape plasmas and are showing that their operational domain at H = 1 is significantly reduced with the JET-ILW mainly because of the need to inject a large amount of gas (above 1022 D s−1) to control core radiation; (iii) in contrast, the hybrid H-mode scenario has reached an H factor of 1.2–1.3 at βN of 3 for 2–3 s; and, (iv) in comparison to carbon equivalent discharges, total radiation is similar but the edge radiation is lower and Zeff of the order of 1.3–1.4. Strong core radiation peaking is observed in H-mode discharges at a low gas fuelling rate (i.e. below 0.5 × 1022 D s−1) and low ELM frequency (typically less than 10 Hz), even when the tungsten influx from the diverter is constant. High-Z impurity transport from the plasma edge to the core appears to be the dominant factor to explain these observations. This paper reviews the major physics and operational achievements and challenges that an ITER-like wall configuration has to face to produce stable plasma scenarios with maximized performance.
LanguageEnglish
Pages1-12
JournalNuclear Fusion
Volume54
Issue number1
DOIs
StatePublished - Jan 2014
Externally publishedYes

Keywords

  • JET
  • ITER-like wall
  • scenario

Cite this

Joffrin, E., Baruzzo, M., Beurskens, M. N. A., Bourdelle, C., Brezinsek, S., Bucalossi, J., ... Voitsekhovitch, I. (2014). First scenario development with the JET new ITER-like wall. Nuclear Fusion, 54(1), 1-12. DOI: 10.1088/0029-5515/54/1/013011
Joffrin, E. ; Baruzzo, M. ; Beurskens, M.N.A. ; Bourdelle, C. ; Brezinsek, S. ; Bucalossi, J. ; Buratti, P. ; Calabro, G. ; Challis, C. D. ; Clever, M. ; Coenen, J. ; Delabie, E. ; Dux, R. ; Lomas, P. ; de la Luna, E. ; de Vries, P. ; Flanagan, J. ; Frassinetti, L. ; Frigione, D. ; Giroud, C. ; Groth, M. ; Hawkes, N. ; Hobirk, J. ; Lehnen, M. ; Maddison, G. ; Mailloux, J. ; Maggi, C. F. ; Matthews, G. ; Mayoral, M. ; Meigs, A. ; Neu, R. ; Nunes, I. ; Puetterich, T. ; Rimini, F. ; Sertoli, M. ; Sieglin, B. ; Sips, A.C.C. ; van Rooij, G.J. ; Voitsekhovitch, I./ First scenario development with the JET new ITER-like wall. In: Nuclear Fusion. 2014 ; Vol. 54, No. 1. pp. 1-12
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abstract = "In the recent JET experimental campaigns with the new ITER-like wall (JET-ILW), major progress has been achieved in the characterization and operation of the H-mode regime in metallic environments: (i) plasma breakdown has been achieved at the first attempt and X-point L-mode operation recovered in a few days of operation; (ii) stationary and stable type-I ELMy H-modes with βN ~ 1.4 have been achieved in low and high triangularity ITER-like shape plasmas and are showing that their operational domain at H = 1 is significantly reduced with the JET-ILW mainly because of the need to inject a large amount of gas (above 1022 D s−1) to control core radiation; (iii) in contrast, the hybrid H-mode scenario has reached an H factor of 1.2–1.3 at βN of 3 for 2–3 s; and, (iv) in comparison to carbon equivalent discharges, total radiation is similar but the edge radiation is lower and Zeff of the order of 1.3–1.4. Strong core radiation peaking is observed in H-mode discharges at a low gas fuelling rate (i.e. below 0.5 × 1022 D s−1) and low ELM frequency (typically less than 10 Hz), even when the tungsten influx from the diverter is constant. High-Z impurity transport from the plasma edge to the core appears to be the dominant factor to explain these observations. This paper reviews the major physics and operational achievements and challenges that an ITER-like wall configuration has to face to produce stable plasma scenarios with maximized performance.",
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Joffrin, E, Baruzzo, M, Beurskens, MNA, Bourdelle, C, Brezinsek, S, Bucalossi, J, Buratti, P, Calabro, G, Challis, CD, Clever, M, Coenen, J, Delabie, E, Dux, R, Lomas, P, de la Luna, E, de Vries, P, Flanagan, J, Frassinetti, L, Frigione, D, Giroud, C, Groth, M, Hawkes, N, Hobirk, J, Lehnen, M, Maddison, G, Mailloux, J, Maggi, CF, Matthews, G, Mayoral, M, Meigs, A, Neu, R, Nunes, I, Puetterich, T, Rimini, F, Sertoli, M, Sieglin, B, Sips, ACC, van Rooij, GJ & Voitsekhovitch, I 2014, 'First scenario development with the JET new ITER-like wall' Nuclear Fusion, vol. 54, no. 1, pp. 1-12. DOI: 10.1088/0029-5515/54/1/013011

First scenario development with the JET new ITER-like wall. / Joffrin, E.; Baruzzo, M.; Beurskens, M.N.A.; Bourdelle, C.; Brezinsek, S.; Bucalossi, J.; Buratti, P.; Calabro, G.; Challis, C. D.; Clever, M.; Coenen, J.; Delabie, E.; Dux, R.; Lomas, P.; de la Luna, E.; de Vries, P.; Flanagan, J.; Frassinetti, L.; Frigione, D.; Giroud, C.; Groth, M.; Hawkes, N.; Hobirk, J.; Lehnen, M.; Maddison, G.; Mailloux, J.; Maggi, C. F.; Matthews, G.; Mayoral, M.; Meigs, A.; Neu, R.; Nunes, I.; Puetterich, T.; Rimini, F.; Sertoli, M.; Sieglin, B.; Sips, A.C.C.; van Rooij, G.J.; Voitsekhovitch, I.

In: Nuclear Fusion, Vol. 54, No. 1, 01.2014, p. 1-12.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - First scenario development with the JET new ITER-like wall

AU - Joffrin,E.

AU - Baruzzo,M.

AU - Beurskens,M.N.A.

AU - Bourdelle,C.

AU - Brezinsek,S.

AU - Bucalossi,J.

AU - Buratti,P.

AU - Calabro,G.

AU - Challis,C. D.

AU - Clever,M.

AU - Coenen,J.

AU - Delabie,E.

AU - Dux,R.

AU - Lomas,P.

AU - de la Luna,E.

AU - de Vries,P.

AU - Flanagan,J.

AU - Frassinetti,L.

AU - Frigione,D.

AU - Giroud,C.

AU - Groth,M.

AU - Hawkes,N.

AU - Hobirk,J.

AU - Lehnen,M.

AU - Maddison,G.

AU - Mailloux,J.

AU - Maggi,C. F.

AU - Matthews,G.

AU - Mayoral,M.

AU - Meigs,A.

AU - Neu,R.

AU - Nunes,I.

AU - Puetterich,T.

AU - Rimini,F.

AU - Sertoli,M.

AU - Sieglin,B.

AU - Sips,A.C.C.

AU - van Rooij,G.J.

AU - Voitsekhovitch,I.

PY - 2014/1

Y1 - 2014/1

N2 - In the recent JET experimental campaigns with the new ITER-like wall (JET-ILW), major progress has been achieved in the characterization and operation of the H-mode regime in metallic environments: (i) plasma breakdown has been achieved at the first attempt and X-point L-mode operation recovered in a few days of operation; (ii) stationary and stable type-I ELMy H-modes with βN ~ 1.4 have been achieved in low and high triangularity ITER-like shape plasmas and are showing that their operational domain at H = 1 is significantly reduced with the JET-ILW mainly because of the need to inject a large amount of gas (above 1022 D s−1) to control core radiation; (iii) in contrast, the hybrid H-mode scenario has reached an H factor of 1.2–1.3 at βN of 3 for 2–3 s; and, (iv) in comparison to carbon equivalent discharges, total radiation is similar but the edge radiation is lower and Zeff of the order of 1.3–1.4. Strong core radiation peaking is observed in H-mode discharges at a low gas fuelling rate (i.e. below 0.5 × 1022 D s−1) and low ELM frequency (typically less than 10 Hz), even when the tungsten influx from the diverter is constant. High-Z impurity transport from the plasma edge to the core appears to be the dominant factor to explain these observations. This paper reviews the major physics and operational achievements and challenges that an ITER-like wall configuration has to face to produce stable plasma scenarios with maximized performance.

AB - In the recent JET experimental campaigns with the new ITER-like wall (JET-ILW), major progress has been achieved in the characterization and operation of the H-mode regime in metallic environments: (i) plasma breakdown has been achieved at the first attempt and X-point L-mode operation recovered in a few days of operation; (ii) stationary and stable type-I ELMy H-modes with βN ~ 1.4 have been achieved in low and high triangularity ITER-like shape plasmas and are showing that their operational domain at H = 1 is significantly reduced with the JET-ILW mainly because of the need to inject a large amount of gas (above 1022 D s−1) to control core radiation; (iii) in contrast, the hybrid H-mode scenario has reached an H factor of 1.2–1.3 at βN of 3 for 2–3 s; and, (iv) in comparison to carbon equivalent discharges, total radiation is similar but the edge radiation is lower and Zeff of the order of 1.3–1.4. Strong core radiation peaking is observed in H-mode discharges at a low gas fuelling rate (i.e. below 0.5 × 1022 D s−1) and low ELM frequency (typically less than 10 Hz), even when the tungsten influx from the diverter is constant. High-Z impurity transport from the plasma edge to the core appears to be the dominant factor to explain these observations. This paper reviews the major physics and operational achievements and challenges that an ITER-like wall configuration has to face to produce stable plasma scenarios with maximized performance.

KW - JET

KW - ITER-like wall

KW - scenario

U2 - 10.1088/0029-5515/54/1/013011

DO - 10.1088/0029-5515/54/1/013011

M3 - Article

VL - 54

SP - 1

EP - 12

JO - Nuclear Fusion

T2 - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 1

ER -

Joffrin E, Baruzzo M, Beurskens MNA, Bourdelle C, Brezinsek S, Bucalossi J et al. First scenario development with the JET new ITER-like wall. Nuclear Fusion. 2014 Jan;54(1):1-12. Available from, DOI: 10.1088/0029-5515/54/1/013011