Recent progress on JET towards the ITER reference mode of operation at high density

J. Ongena; W. Suttrop; M. Bécoulet; G. Cordey; P. Dumortier; Th Eich; L. C. Ingesson; S. Jachmich; P. Lang; A. Loarte; P. Lomas; G. P. Maddison; A. Messiaen; M. F.F. Nave; J. Rapp; G. Saibene; R. Sartori; O. Sauter; J. D. Strachan; B. Unterberg; M. Valovic; B. Alper; Ph Andrew; Y. Baranov; J. Brzozowski; J. Bucalossi; M. Brix; R. Budny; M. Charlet; I. Coffey; M. De Baar; P. De Vries; C. Gowers; N. Hawkes; M. Von Hellermann; D. L. Hillis; J. Hogan; G. L. Jackson; E. Joffrin; C. Jupen; A. Kallenbach; H. R. Koslowski; K. D. Lawson; M. Mantsinen; G. Matthews; P. Monier-Garbet; D. McDonald; F. Milani; M. Murakami; A. Murari; R. Neu; V. Parail; S. Podda; M. E. Puiatti; E. Righi; F. Sartori; Y. Sarazin; A. Staebler; M. Stamp; G. Telesca; M. Valisa; B. Weyssow; K. D. Zastrow

doi:10.1088/0741-3335/43/12A/302

Recent progress on JET towards the ITER reference mode of operation at high density

J. Ongena, W. Suttrop, M. Bécoulet, G. Cordey, P. Dumortier, Th Eich, L. C. Ingesson, S. Jachmich, P. Lang, A. Loarte, P. Lomas, G. P. Maddison, A. Messiaen, M. F.F. Nave, J. Rapp, G. Saibene, R. Sartori, O. Sauter, J. D. Strachan, B. UnterbergM. Valovic, B. Alper, Ph Andrew, Y. Baranov, J. Brzozowski, J. Bucalossi, M. Brix, R. Budny, M. Charlet, I. Coffey, M. De Baar, P. De Vries, C. Gowers, N. Hawkes, M. Von Hellermann, D. L. Hillis, J. Hogan, G. L. Jackson, E. Joffrin, C. Jupen, A. Kallenbach, H. R. Koslowski, K. D. Lawson, M. Mantsinen, G. Matthews, P. Monier-Garbet, D. McDonald, F. Milani, M. Murakami, A. Murari, R. Neu, V. Parail, S. Podda, M. E. Puiatti, E. Righi, F. Sartori, Y. Sarazin, A. Staebler, M. Stamp, G. Telesca, M. Valisa, B. Weyssow, K. D. Zastrow

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Abstract

Recent progress towards obtaining high density and high confinement in JET as required for the ITER reference scenario at Q = 10 is summarized. Plasmas with simultaneous confinement H_98(y,2) = 1 and densities up to n/n_GW ∼ 1 are now routinely obtained. This has been possible (i) by using plasmas at high (δ ∼ 0.5) and medium (δ ∼ 0.3-0.4) triangularity with sufficient heating power to maintain Type I ELMs, (ii) with impurity seeded plasmas at high (δ ∼ 0.5) and low (δ ≤ 0.2) triangularity, (iii) with an optimized pellet injection sequence, maintaining the energy confinement and raising the density, and (iv) by carefully tuning the gas puff rate leading to plasmas with peaked density profiles and good confinement at long time scales. These high performance discharges exhibit Type I ELMs, with a new and more favourable behaviour observed at high densities, requiring further studies. Techniques for a possible mitigation of these ELMs are discussed, and first promising results are obtained with impurity seeding in discharges at high triangularity. Scaling studies using the new data of this year show a strong dependence of confinement on upper triangularity, density and proximity to the Greenwald limit. Observed MHD instabilities and methods to avoid these in high density and high confinement plasmas are discussed.

Original language	English
Pages (from-to)	A11-A30
Journal	Plasma Physics and Controlled Fusion
Volume	43
Issue number	12A
DOIs	https://doi.org/10.1088/0741-3335/43/12A/302
State	Published - 2001
Externally published	Yes

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10.1088/0741-3335/43/12A/302

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Ongena, J., Suttrop, W., Bécoulet, M., Cordey, G., Dumortier, P., Eich, T., Ingesson, L. C., Jachmich, S., Lang, P., Loarte, A., Lomas, P., Maddison, G. P., Messiaen, A., Nave, M. F. F., Rapp, J., Saibene, G., Sartori, R., Sauter, O., Strachan, J. D., ... Zastrow, K. D. (2001). Recent progress on JET towards the ITER reference mode of operation at high density. Plasma Physics and Controlled Fusion, 43(12A), A11-A30. https://doi.org/10.1088/0741-3335/43/12A/302

@article{dcf951a200ba4578ae8ad8c6d889a727,

title = "Recent progress on JET towards the ITER reference mode of operation at high density",

abstract = "Recent progress towards obtaining high density and high confinement in JET as required for the ITER reference scenario at Q = 10 is summarized. Plasmas with simultaneous confinement H98(y,2) = 1 and densities up to n/nGW ∼ 1 are now routinely obtained. This has been possible (i) by using plasmas at high (δ ∼ 0.5) and medium (δ ∼ 0.3-0.4) triangularity with sufficient heating power to maintain Type I ELMs, (ii) with impurity seeded plasmas at high (δ ∼ 0.5) and low (δ ≤ 0.2) triangularity, (iii) with an optimized pellet injection sequence, maintaining the energy confinement and raising the density, and (iv) by carefully tuning the gas puff rate leading to plasmas with peaked density profiles and good confinement at long time scales. These high performance discharges exhibit Type I ELMs, with a new and more favourable behaviour observed at high densities, requiring further studies. Techniques for a possible mitigation of these ELMs are discussed, and first promising results are obtained with impurity seeding in discharges at high triangularity. Scaling studies using the new data of this year show a strong dependence of confinement on upper triangularity, density and proximity to the Greenwald limit. Observed MHD instabilities and methods to avoid these in high density and high confinement plasmas are discussed.",

author = "J. Ongena and W. Suttrop and M. B{\'e}coulet and G. Cordey and P. Dumortier and Th Eich and Ingesson, {L. C.} and S. Jachmich and P. Lang and A. Loarte and P. Lomas and Maddison, {G. P.} and A. Messiaen and Nave, {M. F.F.} and J. Rapp and G. Saibene and R. Sartori and O. Sauter and Strachan, {J. D.} and B. Unterberg and M. Valovic and B. Alper and Ph Andrew and Y. Baranov and J. Brzozowski and J. Bucalossi and M. Brix and R. Budny and M. Charlet and I. Coffey and {De Baar}, M. and {De Vries}, P. and C. Gowers and N. Hawkes and {Von Hellermann}, M. and Hillis, {D. L.} and J. Hogan and Jackson, {G. L.} and E. Joffrin and C. Jupen and A. Kallenbach and Koslowski, {H. R.} and Lawson, {K. D.} and M. Mantsinen and G. Matthews and P. Monier-Garbet and D. McDonald and F. Milani and M. Murakami and A. Murari and R. Neu and V. Parail and S. Podda and Puiatti, {M. E.} and E. Righi and F. Sartori and Y. Sarazin and A. Staebler and M. Stamp and G. Telesca and M. Valisa and B. Weyssow and Zastrow, {K. D.}",

year = "2001",

doi = "10.1088/0741-3335/43/12A/302",

language = "English",

volume = "43",

pages = "A11--A30",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing",

number = "12A",

}

Ongena, J, Suttrop, W, Bécoulet, M, Cordey, G, Dumortier, P, Eich, T, Ingesson, LC, Jachmich, S, Lang, P, Loarte, A, Lomas, P, Maddison, GP, Messiaen, A, Nave, MFF, Rapp, J, Saibene, G, Sartori, R, Sauter, O, Strachan, JD, Unterberg, B, Valovic, M, Alper, B, Andrew, P, Baranov, Y, Brzozowski, J, Bucalossi, J, Brix, M, Budny, R, Charlet, M, Coffey, I, De Baar, M, De Vries, P, Gowers, C, Hawkes, N, Von Hellermann, M, Hillis, DL, Hogan, J, Jackson, GL, Joffrin, E, Jupen, C, Kallenbach, A, Koslowski, HR, Lawson, KD, Mantsinen, M, Matthews, G, Monier-Garbet, P, McDonald, D, Milani, F, Murakami, M, Murari, A, Neu, R, Parail, V, Podda, S, Puiatti, ME, Righi, E, Sartori, F, Sarazin, Y, Staebler, A, Stamp, M, Telesca, G, Valisa, M, Weyssow, B & Zastrow, KD 2001, 'Recent progress on JET towards the ITER reference mode of operation at high density', Plasma Physics and Controlled Fusion, vol. 43, no. 12A, pp. A11-A30. https://doi.org/10.1088/0741-3335/43/12A/302

TY - JOUR

T1 - Recent progress on JET towards the ITER reference mode of operation at high density

AU - Ongena, J.

AU - Suttrop, W.

AU - Bécoulet, M.

AU - Cordey, G.

AU - Dumortier, P.

AU - Eich, Th

AU - Ingesson, L. C.

AU - Jachmich, S.

AU - Lang, P.

AU - Loarte, A.

AU - Lomas, P.

AU - Maddison, G. P.

AU - Messiaen, A.

AU - Nave, M. F.F.

AU - Rapp, J.

AU - Saibene, G.

AU - Sartori, R.

AU - Sauter, O.

AU - Strachan, J. D.

AU - Unterberg, B.

AU - Valovic, M.

AU - Alper, B.

AU - Andrew, Ph

AU - Baranov, Y.

AU - Brzozowski, J.

AU - Bucalossi, J.

AU - Brix, M.

AU - Budny, R.

AU - Charlet, M.

AU - Coffey, I.

AU - De Baar, M.

AU - De Vries, P.

AU - Gowers, C.

AU - Hawkes, N.

AU - Von Hellermann, M.

AU - Hillis, D. L.

AU - Hogan, J.

AU - Jackson, G. L.

AU - Joffrin, E.

AU - Jupen, C.

AU - Kallenbach, A.

AU - Koslowski, H. R.

AU - Lawson, K. D.

AU - Mantsinen, M.

AU - Matthews, G.

AU - Monier-Garbet, P.

AU - McDonald, D.

AU - Milani, F.

AU - Murakami, M.

AU - Murari, A.

AU - Neu, R.

AU - Parail, V.

AU - Podda, S.

AU - Puiatti, M. E.

AU - Righi, E.

AU - Sartori, F.

AU - Sarazin, Y.

AU - Staebler, A.

AU - Stamp, M.

AU - Telesca, G.

AU - Valisa, M.

AU - Weyssow, B.

AU - Zastrow, K. D.

PY - 2001

Y1 - 2001

N2 - Recent progress towards obtaining high density and high confinement in JET as required for the ITER reference scenario at Q = 10 is summarized. Plasmas with simultaneous confinement H98(y,2) = 1 and densities up to n/nGW ∼ 1 are now routinely obtained. This has been possible (i) by using plasmas at high (δ ∼ 0.5) and medium (δ ∼ 0.3-0.4) triangularity with sufficient heating power to maintain Type I ELMs, (ii) with impurity seeded plasmas at high (δ ∼ 0.5) and low (δ ≤ 0.2) triangularity, (iii) with an optimized pellet injection sequence, maintaining the energy confinement and raising the density, and (iv) by carefully tuning the gas puff rate leading to plasmas with peaked density profiles and good confinement at long time scales. These high performance discharges exhibit Type I ELMs, with a new and more favourable behaviour observed at high densities, requiring further studies. Techniques for a possible mitigation of these ELMs are discussed, and first promising results are obtained with impurity seeding in discharges at high triangularity. Scaling studies using the new data of this year show a strong dependence of confinement on upper triangularity, density and proximity to the Greenwald limit. Observed MHD instabilities and methods to avoid these in high density and high confinement plasmas are discussed.

AB - Recent progress towards obtaining high density and high confinement in JET as required for the ITER reference scenario at Q = 10 is summarized. Plasmas with simultaneous confinement H98(y,2) = 1 and densities up to n/nGW ∼ 1 are now routinely obtained. This has been possible (i) by using plasmas at high (δ ∼ 0.5) and medium (δ ∼ 0.3-0.4) triangularity with sufficient heating power to maintain Type I ELMs, (ii) with impurity seeded plasmas at high (δ ∼ 0.5) and low (δ ≤ 0.2) triangularity, (iii) with an optimized pellet injection sequence, maintaining the energy confinement and raising the density, and (iv) by carefully tuning the gas puff rate leading to plasmas with peaked density profiles and good confinement at long time scales. These high performance discharges exhibit Type I ELMs, with a new and more favourable behaviour observed at high densities, requiring further studies. Techniques for a possible mitigation of these ELMs are discussed, and first promising results are obtained with impurity seeding in discharges at high triangularity. Scaling studies using the new data of this year show a strong dependence of confinement on upper triangularity, density and proximity to the Greenwald limit. Observed MHD instabilities and methods to avoid these in high density and high confinement plasmas are discussed.

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U2 - 10.1088/0741-3335/43/12A/302

DO - 10.1088/0741-3335/43/12A/302

M3 - Article

AN - SCOPUS:6444245380

SN - 0741-3335

VL - 43

SP - A11-A30

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 12A

ER -

Recent progress on JET towards the ITER reference mode of operation at high density

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