Long pulse high performance discharges in the DIII-D tokamak

T. C. Luce; M. R. Wade; P. A. Politzer; S. L. Allen; M. E. Austin; D. R. Baker; B. Bray; D. P. Brennan; K. H. Burrell; T. A. Casper; M. S. Chu; J. C. DeBoo; E. J. Doyle; J. R. Ferron; 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:10.1088/0029-5515/41/11/308

Long pulse high performance discharges in the DIII-D tokamak

T. C. Luce, M. R. Wade, P. A. Politzer, S. L. Allen, M. E. Austin, D. R. Baker, B. Bray, D. P. Brennan, K. H. Burrell, T. A. Casper, M. S. Chu, J. C. DeBoo, E. J. Doyle, J. R. Ferron, 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 in obtaining high performance discharges lasting many energy confinement times in the DIII-D tokamak has been realized in recent experimental campaigns. Normalized performance ∼10 has been sustained for more than 5>_E with q_min > 1.5. (The normalized performance is measured by the product β_NH₈₉, indicating the proximity to the conventional β limits and energy confinement quality, respectively.) These H mode discharges have an ELMing edge and β < 5%. The limit to increasing β is a resistive wall mode, rather than the tearing modes as previously observed. Confinement remains good despite q_min > 1. The global parameters were chosen to optimize the potential for fully non-inductive current sustainment at high performance, which is a key program goal for the DIII-D facility. Measurement of the current density and loop voltage profiles indicate that ≈75% of the current in the present discharges is sustained non-inductively. The remaining ohmic current is localized near the half-radius. The electron cyclotron heating system is being upgraded to replace this remaining current with ECCD. Density and β control, which are essential for operating advanced tokamak discharges, were demonstrated in ELMing H mode discharges with β_NH₈₉ ≈ 7 for up to 6.3 s or ≈34τ_E. These discharges appear to have stationary current profiles with q_min ≈ 1.05 in agreement with the current profile relaxation time ≈1.8 s.

Original language	English
Pages (from-to)	1585-1599
Number of pages	15
Journal	Nuclear Fusion
Volume	41
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/41/11/308
State	Published - Nov 2001

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Luce, T. C., Wade, M. R., Politzer, P. A., Allen, S. L., Austin, M. E., Baker, D. R., Bray, B., Brennan, D. P., Burrell, K. H., Casper, T. A., Chu, M. S., DeBoo, J. C., Doyle, E. J., Ferron, J. R., Garofalo, A. M., Gohil, P., Gorelov, I. A., Greenfield, C. M., Groebner, R. J., ... Wong, K. L. (2001). Long pulse high performance discharges in the DIII-D tokamak. Nuclear Fusion, 41(11), 1585-1599. https://doi.org/10.1088/0029-5515/41/11/308

@article{5f4e40e745b44ec0963b10ae70ba1693,

title = "Long pulse high performance discharges in the DIII-D tokamak",

abstract = "Significant progress in obtaining high performance discharges lasting many energy confinement times in the DIII-D tokamak has been realized in recent experimental campaigns. Normalized performance ∼10 has been sustained for more than 5>E with qmin > 1.5. (The normalized performance is measured by the product βNH89, indicating the proximity to the conventional β limits and energy confinement quality, respectively.) These H mode discharges have an ELMing edge and β < 5%. The limit to increasing β is a resistive wall mode, rather than the tearing modes as previously observed. Confinement remains good despite qmin > 1. The global parameters were chosen to optimize the potential for fully non-inductive current sustainment at high performance, which is a key program goal for the DIII-D facility. Measurement of the current density and loop voltage profiles indicate that ≈75% of the current in the present discharges is sustained non-inductively. The remaining ohmic current is localized near the half-radius. The electron cyclotron heating system is being upgraded to replace this remaining current with ECCD. Density and β control, which are essential for operating advanced tokamak discharges, were demonstrated in ELMing H mode discharges with βNH89 ≈ 7 for up to 6.3 s or ≈34τE. These discharges appear to have stationary current profiles with qmin ≈ 1.05 in agreement with the current profile relaxation time ≈1.8 s.",

author = "Luce, {T. C.} and Wade, {M. R.} and Politzer, {P. A.} and Allen, {S. L.} and Austin, {M. E.} and Baker, {D. R.} and B. Bray and Brennan, {D. P.} and Burrell, {K. H.} and Casper, {T. A.} and Chu, {M. S.} and DeBoo, {J. C.} and Doyle, {E. J.} and Ferron, {J. R.} 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 = nov,

doi = "10.1088/0029-5515/41/11/308",

language = "English",

volume = "41",

pages = "1585--1599",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "11",

}

Luce, TC, Wade, MR, Politzer, PA, Allen, SL, Austin, ME, Baker, DR, Bray, B, Brennan, DP, Burrell, KH, Casper, TA, Chu, MS, DeBoo, JC, Doyle, EJ, Ferron, JR, 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, 'Long pulse high performance discharges in the DIII-D tokamak', Nuclear Fusion, vol. 41, no. 11, pp. 1585-1599. https://doi.org/10.1088/0029-5515/41/11/308

TY - JOUR

T1 - Long pulse high performance discharges in the DIII-D tokamak

AU - Luce, T. C.

AU - Wade, M. R.

AU - Politzer, P. A.

AU - Allen, S. L.

AU - Austin, M. E.

AU - Baker, D. R.

AU - Bray, B.

AU - Brennan, D. P.

AU - Burrell, K. H.

AU - Casper, T. A.

AU - Chu, M. S.

AU - DeBoo, J. C.

AU - Doyle, E. J.

AU - Ferron, J. R.

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 - 2001/11

Y1 - 2001/11

N2 - Significant progress in obtaining high performance discharges lasting many energy confinement times in the DIII-D tokamak has been realized in recent experimental campaigns. Normalized performance ∼10 has been sustained for more than 5>E with qmin > 1.5. (The normalized performance is measured by the product βNH89, indicating the proximity to the conventional β limits and energy confinement quality, respectively.) These H mode discharges have an ELMing edge and β < 5%. The limit to increasing β is a resistive wall mode, rather than the tearing modes as previously observed. Confinement remains good despite qmin > 1. The global parameters were chosen to optimize the potential for fully non-inductive current sustainment at high performance, which is a key program goal for the DIII-D facility. Measurement of the current density and loop voltage profiles indicate that ≈75% of the current in the present discharges is sustained non-inductively. The remaining ohmic current is localized near the half-radius. The electron cyclotron heating system is being upgraded to replace this remaining current with ECCD. Density and β control, which are essential for operating advanced tokamak discharges, were demonstrated in ELMing H mode discharges with βNH89 ≈ 7 for up to 6.3 s or ≈34τE. These discharges appear to have stationary current profiles with qmin ≈ 1.05 in agreement with the current profile relaxation time ≈1.8 s.

AB - Significant progress in obtaining high performance discharges lasting many energy confinement times in the DIII-D tokamak has been realized in recent experimental campaigns. Normalized performance ∼10 has been sustained for more than 5>E with qmin > 1.5. (The normalized performance is measured by the product βNH89, indicating the proximity to the conventional β limits and energy confinement quality, respectively.) These H mode discharges have an ELMing edge and β < 5%. The limit to increasing β is a resistive wall mode, rather than the tearing modes as previously observed. Confinement remains good despite qmin > 1. The global parameters were chosen to optimize the potential for fully non-inductive current sustainment at high performance, which is a key program goal for the DIII-D facility. Measurement of the current density and loop voltage profiles indicate that ≈75% of the current in the present discharges is sustained non-inductively. The remaining ohmic current is localized near the half-radius. The electron cyclotron heating system is being upgraded to replace this remaining current with ECCD. Density and β control, which are essential for operating advanced tokamak discharges, were demonstrated in ELMing H mode discharges with βNH89 ≈ 7 for up to 6.3 s or ≈34τE. These discharges appear to have stationary current profiles with qmin ≈ 1.05 in agreement with the current profile relaxation time ≈1.8 s.

UR - http://www.scopus.com/inward/record.url?scp=0035522192&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/41/11/308

DO - 10.1088/0029-5515/41/11/308

M3 - Article

AN - SCOPUS:0035522192

SN - 0029-5515

VL - 41

SP - 1585

EP - 1599

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 11

ER -

Long pulse high performance discharges in the DIII-D tokamak

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