Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak

M. R. Wade; T. C. Luce; P. A. Politzer; J. R. Ferron; S. L. Allen; M. E. Austin; D. R. Baker; B. Bray; D. P. Brennen; K. H. Burrell; T. A. Casper; M. S. Chu; J. C. DeBoo; E. J. Doyle; A. M. Garofalo; P. Gohil; I. A. Gorelov; C. M. Greenfield; R. J. Groebner; W. W. Heidbrink; C. L. Hsieh; A. W. Hyatt; R. Jayakumar; J. E. Kinsey; R. J. La Haye; L. L. Lao; C. J. Lasnier; E. A. Lazarus; A. W. Leonard; Y. R. Lin-Liu; J. Lohr; M. A. Mahdavi; M. A. Makowski; M. Murakami; C. C. Petty; R. I. Pinsker; R. Prater; C. L. Rettig; T. L. Rhodes; B. W. Rice; E. J. Strait; T. S. Taylor; D. M. Thomas; A. D. Turnbull; J. G. Watkins; W. P. West; K. L. Wong

doi:10.1063/1.1355980

Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak

M. R. Wade, T. C. Luce, P. A. Politzer, J. R. Ferron, S. L. Allen, M. E. Austin, D. R. Baker, B. Bray, D. P. Brennen, K. H. Burrell, T. A. Casper, M. S. Chu, J. C. DeBoo, E. J. Doyle, A. M. Garofalo, P. Gohil, I. A. Gorelov, C. M. Greenfield, R. J. Groebner, W. W. HeidbrinkC. L. Hsieh, A. W. Hyatt, R. Jayakumar, J. E. Kinsey, R. J. La Haye, L. L. Lao, C. J. Lasnier, E. A. Lazarus, A. W. Leonard, Y. R. Lin-Liu, J. Lohr, M. A. Mahdavi, M. A. Makowski, M. Murakami, C. C. Petty, R. I. Pinsker, R. Prater, C. L. Rettig, T. L. Rhodes, B. W. Rice, E. J. Strait, T. S. Taylor, D. M. Thomas, A. D. Turnbull, J. G. Watkins, W. P. West, K. L. Wong

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Abstract

Significant progress has been made in obtaining high-performance discharges for many energy confinement times in the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1987). Vol. I, p. 159]. Normalized performance (measured by the product of β_NH₈₉ and indicative of the proximity to both conventional β limits and energy confinement quality, respectively) ∼10 has been sustained for >5 τ_E with q_min> 1.5. These edge localized modes (ELMing) H-mode discharges have β∼5%, which is limited by the onset of resistive wall modes slightly above the ideal no-wall n = 1 limit, with approximately 75% of the current driven noninductively. The remaining Ohmic current is localized near the half-radius. The DIII-D electron cyclotron heating system is being upgraded to replace this inductively driven current with localized electron cyclotron current drive (ECCD). Density control, which is required for effective ECCD, has been successfully demonstrated in long-pulse high-performance ELMing H-mode discharges with β_NH₈₉∼7 for up to 6.3 s. In plasma shapes compatible with good density control in the present divertor configuration, the achieved β_N is somewhat less than that in the high β_NH₈₉ = 10 discharges.

Original language	English
Pages (from-to)	2208-2216
Number of pages	9
Journal	Physics of Plasmas
Volume	8
Issue number	5 II
DOIs	https://doi.org/10.1063/1.1355980
State	Published - May 2001
Event	42nd Annual Meeting of the APS Division of Plasma Physics - Quebec, Que, Canada Duration: Oct 23 2000 → Oct 27 2000

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Wade, M. R., Luce, T. C., Politzer, P. A., Ferron, J. R., Allen, S. L., Austin, M. E., Baker, D. R., Bray, B., Brennen, D. P., Burrell, K. H., Casper, T. A., Chu, M. S., DeBoo, J. C., Doyle, E. J., Garofalo, A. M., Gohil, P., Gorelov, I. A., Greenfield, C. M., Groebner, R. J., ... Wong, K. L. (2001). Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak. Physics of Plasmas, 8(5 II), 2208-2216. https://doi.org/10.1063/1.1355980

@article{d20a8b47f8ee4caf9eae68fa47ad5342,

title = "Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak",

abstract = "Significant progress has been made in obtaining high-performance discharges for many energy confinement times in the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1987). Vol. I, p. 159]. Normalized performance (measured by the product of βNH89 and indicative of the proximity to both conventional β limits and energy confinement quality, respectively) ∼10 has been sustained for >5 τE with qmin> 1.5. These edge localized modes (ELMing) H-mode discharges have β∼5%, which is limited by the onset of resistive wall modes slightly above the ideal no-wall n = 1 limit, with approximately 75% of the current driven noninductively. The remaining Ohmic current is localized near the half-radius. The DIII-D electron cyclotron heating system is being upgraded to replace this inductively driven current with localized electron cyclotron current drive (ECCD). Density control, which is required for effective ECCD, has been successfully demonstrated in long-pulse high-performance ELMing H-mode discharges with βNH89∼7 for up to 6.3 s. In plasma shapes compatible with good density control in the present divertor configuration, the achieved βN is somewhat less than that in the high βNH89 = 10 discharges.",

author = "Wade, {M. R.} and Luce, {T. C.} and Politzer, {P. A.} and Ferron, {J. R.} and Allen, {S. L.} and Austin, {M. E.} and Baker, {D. R.} and B. Bray and Brennen, {D. P.} and Burrell, {K. H.} and Casper, {T. A.} and Chu, {M. S.} and DeBoo, {J. C.} and Doyle, {E. J.} and Garofalo, {A. M.} and P. Gohil and Gorelov, {I. A.} and Greenfield, {C. M.} and Groebner, {R. J.} and Heidbrink, {W. W.} and Hsieh, {C. L.} and Hyatt, {A. W.} and R. Jayakumar and Kinsey, {J. E.} and {La Haye}, {R. J.} and Lao, {L. L.} and Lasnier, {C. J.} and Lazarus, {E. A.} and Leonard, {A. W.} and Lin-Liu, {Y. R.} and J. Lohr and Mahdavi, {M. A.} and Makowski, {M. A.} and M. Murakami and Petty, {C. C.} and Pinsker, {R. I.} and R. Prater and Rettig, {C. L.} and Rhodes, {T. L.} and Rice, {B. W.} and Strait, {E. J.} and Taylor, {T. S.} and Thomas, {D. M.} and Turnbull, {A. D.} and Watkins, {J. G.} and West, {W. P.} and Wong, {K. L.}",

year = "2001",

month = may,

doi = "10.1063/1.1355980",

language = "English",

volume = "8",

pages = "2208--2216",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5 II",

note = "42nd Annual Meeting of the APS Division of Plasma Physics ; Conference date: 23-10-2000 Through 27-10-2000",

}

Wade, MR, Luce, TC, Politzer, PA, Ferron, JR, Allen, SL, Austin, ME, Baker, DR, Bray, B, Brennen, DP, Burrell, KH, Casper, TA, Chu, MS, DeBoo, JC, Doyle, EJ, Garofalo, AM, Gohil, P, Gorelov, IA, Greenfield, CM, Groebner, RJ, Heidbrink, WW, Hsieh, CL, Hyatt, AW, Jayakumar, R, Kinsey, JE, La Haye, RJ, Lao, LL, Lasnier, CJ, Lazarus, EA, Leonard, AW, Lin-Liu, YR, Lohr, J, Mahdavi, MA, Makowski, MA, Murakami, M, Petty, CC, Pinsker, RI, Prater, R, Rettig, CL, Rhodes, TL, Rice, BW, Strait, EJ, Taylor, TS, Thomas, DM, Turnbull, AD, Watkins, JG, West, WP & Wong, KL 2001, 'Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak', Physics of Plasmas, vol. 8, no. 5 II, pp. 2208-2216. https://doi.org/10.1063/1.1355980

TY - JOUR

T1 - Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak

AU - Wade, M. R.

AU - Luce, T. C.

AU - Politzer, P. A.

AU - Ferron, J. R.

AU - Allen, S. L.

AU - Austin, M. E.

AU - Baker, D. R.

AU - Bray, B.

AU - Brennen, D. P.

AU - Burrell, K. H.

AU - Casper, T. A.

AU - Chu, M. S.

AU - DeBoo, J. C.

AU - Doyle, E. J.

AU - Garofalo, A. M.

AU - Gohil, P.

AU - Gorelov, I. A.

AU - Greenfield, C. M.

AU - Groebner, R. J.

AU - Heidbrink, W. W.

AU - Hsieh, C. L.

AU - Hyatt, A. W.

AU - Jayakumar, R.

AU - Kinsey, J. E.

AU - La Haye, R. J.

AU - Lao, L. L.

AU - Lasnier, C. J.

AU - Lazarus, E. A.

AU - Leonard, A. W.

AU - Lin-Liu, Y. R.

AU - Lohr, J.

AU - Mahdavi, M. A.

AU - Makowski, M. A.

AU - Murakami, M.

AU - Petty, C. C.

AU - Pinsker, R. I.

AU - Prater, R.

AU - Rettig, C. L.

AU - Rhodes, T. L.

AU - Rice, B. W.

AU - Strait, E. J.

AU - Taylor, T. S.

AU - Thomas, D. M.

AU - Turnbull, A. D.

AU - Watkins, J. G.

AU - West, W. P.

AU - Wong, K. L.

PY - 2001/5

Y1 - 2001/5

N2 - Significant progress has been made in obtaining high-performance discharges for many energy confinement times in the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1987). Vol. I, p. 159]. Normalized performance (measured by the product of βNH89 and indicative of the proximity to both conventional β limits and energy confinement quality, respectively) ∼10 has been sustained for >5 τE with qmin> 1.5. These edge localized modes (ELMing) H-mode discharges have β∼5%, which is limited by the onset of resistive wall modes slightly above the ideal no-wall n = 1 limit, with approximately 75% of the current driven noninductively. The remaining Ohmic current is localized near the half-radius. The DIII-D electron cyclotron heating system is being upgraded to replace this inductively driven current with localized electron cyclotron current drive (ECCD). Density control, which is required for effective ECCD, has been successfully demonstrated in long-pulse high-performance ELMing H-mode discharges with βNH89∼7 for up to 6.3 s. In plasma shapes compatible with good density control in the present divertor configuration, the achieved βN is somewhat less than that in the high βNH89 = 10 discharges.

AB - Significant progress has been made in obtaining high-performance discharges for many energy confinement times in the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1987). Vol. I, p. 159]. Normalized performance (measured by the product of βNH89 and indicative of the proximity to both conventional β limits and energy confinement quality, respectively) ∼10 has been sustained for >5 τE with qmin> 1.5. These edge localized modes (ELMing) H-mode discharges have β∼5%, which is limited by the onset of resistive wall modes slightly above the ideal no-wall n = 1 limit, with approximately 75% of the current driven noninductively. The remaining Ohmic current is localized near the half-radius. The DIII-D electron cyclotron heating system is being upgraded to replace this inductively driven current with localized electron cyclotron current drive (ECCD). Density control, which is required for effective ECCD, has been successfully demonstrated in long-pulse high-performance ELMing H-mode discharges with βNH89∼7 for up to 6.3 s. In plasma shapes compatible with good density control in the present divertor configuration, the achieved βN is somewhat less than that in the high βNH89 = 10 discharges.

UR - http://www.scopus.com/inward/record.url?scp=6644225235&partnerID=8YFLogxK

U2 - 10.1063/1.1355980

DO - 10.1063/1.1355980

M3 - Conference article

AN - SCOPUS:6644225235

SN - 1070-664X

VL - 8

SP - 2208

EP - 2216

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5 II

T2 - 42nd Annual Meeting of the APS Division of Plasma Physics

Y2 - 23 October 2000 through 27 October 2000

ER -

Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak

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