Overview of results from the 2023 DIII-D negative triangularity campaign

被引：10

作者：

Thome, K. E. ^{[1
]}

Austin, M. E. ^{[2
]}

Hyatt, A. ^{[1
]}

Marinoni, A. ^{[3
]}

Nelson, A. O. ^{[4
]}

Paz-Soldan, C. ^{[4
]}

Scotti, F. ^{[5
]}

Boyes, W. ^{[4
]}

Casali, L. ^{[6
]}

Chrystal, C. ^{[1
]}

Ding, S. ^{[1
]}

Du, X. D. ^{[1
]}

Eldon, D. ^{[1
]}

Ernst, D. ^{[7
]}

Hong, R. ^{[8
]}

McKee, G. R. ^{[9
]}

Mordijck, S. ^{[10
]}

Sauter, O. ^{[11
]}

Schmitz, L. ^{[8
]}

Barr, J. L. ^{[1
]}

Burke, M. G. ^{[5
]}

Coda, S. ^{[11
]}

Cote, T. B. ^{[1
]}

Fenstermacher, M. E. ^{[5
]}

Garofalo, A. ^{[1
]}

Khabanov, F. O. ^{[9
]}

Kramer, G. J. ^{[12
]}

Lasnier, C. J. ^{[5
]}

Logan, N. C. ^{[4
]}

Lunia, P. ^{[4
]}

McLean, A. G. ^{[5
]}

Okabayashi, M. ^{[12
]}

Shiraki, D. ^{[13
]}

Stewart, S. ^{[9
]}

Takemura, Y. ^{[14
]}

Truong, D. D. ^{[5
]}

Osborne, T. ^{[1
]}

Van Zeeland, M. A. ^{[1
]}

Victor, B. S. ^{[5
]}

Wang, H. Q. ^{[1
]}

Watkins, J. G. ^{[15
]}

Wehner, W. P. ^{[1
]}

Welander, A. S. ^{[1
]}

Wilks, T. M. ^{[7
]}

Yang, J. ^{[12
]}

Yu, G. ^{[16
]}

Zeng, L. ^{[8
]}

机构：

[1] Gen Atom, San Diego, CA 92121 USA

[2] Univ Texas Austin, Inst Fus Studies, Austin, TX USA

[3] Univ Calif San Diego, San Diego, CA USA

[4] Columbia Univ, Columbia, NY USA

[5] Lawrence Livermore Natl Lab, Livermore, CA USA

[6] Univ Tennessee Knoxville, Knoxville, TN USA

[7] MIT, Plasma Sci & Fus Ctr, Cambridge, MA USA

[8] Univ Calif Los Angeles, Los Angeles, CA USA

[9] Univ Wisconsin Madison, Madison, WI USA

[10] William & Mary, Williamsburg, VA USA

[11] Swiss Plasma Ctr SPC, Lausanne, Switzerland

[12] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ USA

[13] Oak Ridge Natl Lab, Oak Ridge, TN USA

[14] Natl Inst Fus Sci, Toki, Japan

[15] Sandia Natl Labs, Livermore, CA USA

[16] Univ Calif Davis, Davis, CA USA

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2024年 / 66卷 / 10期

关键词：

negative triangularity; NT edge; confinement; PLASMAS; ITER; JET;

D O I：

10.1088/1361-6587/ad6f40

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Negative triangularity (NT) is a potentially transformative configuration for tokamak-based fusion energy with its high-performance core, edge localized mode (ELM)-free edge, and low-field-side divertors that could readily scale to an integrated reactor solution. Previous NT work on the TCV and DIII-D tokamaks motivated the installation of graphite-tile armor on the low-field-side lower outer wall of DIII-D. A dedicated multiple-week experimental campaign was conducted to qualify the NT scenario for future reactors. During the DIII-D NT campaign, high confinement (H-98y,H-2 greater than or similar to 1), high current (q(95)< 3), and high normalized pressure plasmas (beta(N)> 2.5) were simultaneously attained in strongly NT-shaped discharges with average triangularity delta(avg) = -0.5 that were stably controlled. Experiments covered a wide range of DIII-D operational space (plasma current, toroidal field, electron density and pressure) and did not trigger an ELM in a single discharge as long as sufficiently strong NT was maintained; in contrast, to other high-performance ELM-suppression scenarios that have narrower operating windows. These strong NT plasmas had a lower outer divertor X-point shape and maintained a non-ELMing edge with an electron temperature pedestal, exceeding that of typical L-mode plasmas. Also, the following was achieved during the campaign: high normalized density (n(e)/n(GW) of at least 1.7), particle confinement comparable to energy confinement with Z(eff)similar to 2, a detached divertor without impurity seeding, and a mantle radiation scenario using extrinsic impurities. These results are promising for a NT fusion pilot plant but further questions on confinement extrapolation and core-edge integration remain, which motivate future NT studies on DIII-D and beyond.

引用

页数：11

共 50 条

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[2] Effect of rotation on negative triangularity plasmas in DIII-D
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[3] Vertical control of DIII-D discharges with strong negative triangularity
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[8] Effects of negative triangularity shaping on energetic particle driven Alfven eigenmodes in DIII-D *
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[10] Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak
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