Overview of NSTX Upgrade initial results and modelling highlights

被引：61

作者：

Menard, J. E. ^{[1
]}

Allain, J. P. ^{[2
]}

Battaglia, D. J. ^{[1
]}

Bedoya, F. ^{[2
]}

Bell, R. E. ^{[1
]}

Belova, E. ^{[1
]}

Berkery, J. W. ^{[3
]}

Boyer, M. D. ^{[1
]}

Crocker, N. ^{[4
]}

Diallo, A. ^{[1
]}

Ebrahimi, F. ^{[1
]}

Ferraro, N. ^{[1
]}

Fredrickson, E. ^{[1
]}

Frerichs, H. ^{[5
]}

Gerhardt, S. ^{[1
]}

Gorelenkov, N. ^{[1
]}

Guttenfelder, W. ^{[1
]}

Heidbrink, W. ^{[6
]}

Kaita, R. ^{[1
]}

Kaye, S. M. ^{[1
]}

Kriete, D. M. ^{[5
]}

Kubota, S. ^{[4
]}

LeBlanc, B. P. ^{[1
]}

Liu, D. ^{[6
]}

Lunsford, R. ^{[1
]}

Mueller, D. ^{[1
]}

Myers, C. E. ^{[1
]}

Ono, M. ^{[1
]}

Park, J. -K. ^{[1
]}

Podesta, M. ^{[1
]}

Raman, R. ^{[7
]}

Reinke, M. ^{[8
]}

Ren, Y. ^{[1
]}

Sabbagh, S. A. ^{[3
]}

Schmitz, O. ^{[5
]}

Scotti, F. ^{[9
]}

Sechrest, Y. ^{[10
]}

Skinner, C. H. ^{[1
]}

Smith, D. R. ^{[5
]}

Soukhanovskii, V. ^{[9
]}

Stoltzfus-Dueck, T. ^{[1
]}

Yuh, H. ^{[10
]}

Wang, Z. ^{[1
]}

Waters, I. ^{[5
]}

Ahn, J. -W. ^{[8
]}

Andre, R. ^{[1
]}

Barchfeld, R. ^{[11
]}

Beiersdorfer, P. ^{[9
]}

Bertelli, N. ^{[1
]}

Bhattacharjee, A. ^{[1
]}

机构：

[1] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] Univ Illinois, Urbana, IL USA

[3] Columbia Univ, New York, NY USA

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

[5] Univ Wisconsin, Madison, WI USA

[6] Univ Calif Irvine, Irvine, CA USA

[7] Univ Washington, Seattle, WA 98195 USA

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

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

[10] Nova Photon, Princeton, NJ USA

[11] Univ Calif Davis, Davis, CA 95616 USA

[12] Princeton Univ, Princeton, NJ 08544 USA

[13] Gen Atom, San Diego, CA USA

[14] Coll New Jersey, Ewing, NJ USA

[15] Johns Hopkins Univ, Baltimore, MD USA

[16] Univ Tennessee, Knoxville, TN USA

[17] X Sci LLC, Plainsboro, NJ USA

[18] Coll William & Mary, Williamsburg, VA USA

[19] Lodestar Res Corp, Boulder, CO USA

[20] Univ Michigan, Ann Arbor, MI 48109 USA

[21] Lehigh Univ, Bethlehem, PA 18015 USA

来源：

NUCLEAR FUSION | 2017年 / 57卷 / 10期

关键词：

NSTX-U; spherical tokamak; Alfven eigenmodes; plasma material interactions; boronization; error fields; ALFVEN EIGENMODES; CONFINEMENT; EXCITATION; HEAT;

D O I：

10.1088/1741-4326/aa600a

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：

The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in the summer of 2015. NSTX-U first plasma was subsequently achieved, diagnostic and control systems have been commissioned, the H-mode accessed, magnetic error fields identified and mitigated, and the first physics research campaign carried out. During ten run weeks of operation, NSTX-U surpassed NSTX record pulse-durations and toroidal fields (TF), and high-performance similar to 1 MA H-mode plasmas comparable to the best of NSTX have been sustained near and slightly above the n = 1 no-wall stability limit and with H-mode confinement multiplier H-98y,H-2 above 1. Transport and turbulence studies in L-mode plasmas have identified the coexistence of at least two ion-gyro-scale turbulent micro-instabilities near the same radial location but propagating in opposite (i.e. ion and electron diamagnetic) directions. These modes have the characteristics of ion-temperature gradient and micro-tearing modes, respectively, and the role of these modes in contributing to thermal transport is under active investigation. The new second more tangential neutral beam injection was observed to significantly modify the stability of two types of Alfven eigenmodes. Improvements in offline disruption forecasting were made in the areas of identification of rotating MHD modes and other macroscopic instabilities using the disruption event characterization and forecasting code. Lastly, the materials analysis and particle probe was utilized on NSTX-U for the first time and enabled assessments of the correlation between boronized wall conditions and plasma performance. These and other highlights from the first run campaign of NSTX-U are described.

引用

页数：17

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