Overview of NSTX Upgrade initial results and modelling highlights

Menard, J. E.; Allain, J. P.; Battaglia, D. J.; Bedoya, F.; Bell, R. E.; Belova, E.; Berkery, J. W.; Boyer, M. D.; Crocker, N.; Diallo, A.; Ebrahimi, F.; Ferraro, N.; Fredrickson, E.; Frerichs, H.; Gerhardt, S.; Gorelenkov, N.; Guttenfelder, W.; Heidbrink, W.; Kaita, R.; Kaye, S. M.; Kriete, D. M.; Kubota, S.; LeBlanc, B. P.; Liu, D.; Lunsford, R.; Mueller, D.; Myers, C. E.; Ono, M.; Park, J. -K.; Podesta, M.; Raman, R.; Reinke, M.; Ren, Y.; Sabbagh, S. A.; Schmitz, O.; Scotti, F.; Sechrest, Y.; Skinner, C. H.; Smith, D. R.; Soukhanovskii, V.; Stoltzfus-Dueck, T.; Yuh, H.; Wang, Z.; Waters, I.; Ahn, J. -W.; Andre, R.; Barchfeld, R.; Beiersdorfer, P.; Bertelli, N.; Bhattacharjee, A.; Brennan, D.; Buttery, R.; Capece, A.; Canal, G.; Canik, J.; Chang, C. S.; Darrow, D.; Delgado-Aparicio, L.; Domier, C.; Ethier, S.; Evans, T.; Ferron, J.; Finkenthal, M.; Fonck, R.; Gan, K.; Gates, D.; Goumiri, I.; Gray, T.; Hosea, J.; Humphreys, D.; Jarboe, T.; Jardin, S.; Jaworski, M. A.; Koel, B.; Kolemen, E.; Ku, S.; La Haye, R. J.; Levinton, F.; Luhmann, N.; Maingi, R.; Maqueda, R.; McKee, G.; Meier, E.; Myra, J.; Perkins, R.; Poli, F.; Rhodes, T.; Riquezes, J.; Rowley, C.; Russell, D.; Schuster, E.; Stratton, B.; Stutman, D.; Taylor, G.; Tritz, K.; Wang, W.; Wirth, B.; Zweben, S. J.

doi:10.1088/1741-4326/aa600a

Overview of NSTX Upgrade initial results and modelling highlights

Journal Article · Tue Jun 20 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa600a· OSTI ID:1367916

^[1]; Allain, J. P. ^[2]; ^[1]; Bedoya, F. ^[2]; ^[1]; ^[1]; Berkery, J. W. ^[3]; ^[1]; Crocker, N. ^[4]; ^[1]; ^[1]; ^[1]; Fredrickson, E. ^[1]; Frerichs, H. ^[5]; ^[1]; Gorelenkov, N. ^[1]; ^[1]; Heidbrink, W. ^[6]; ^[1]; Kaye, S. M. ^[1] more »

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Illinois, Urbana-Champaign, IL (United States)
Columbia Univ., New York, NY (United States)
Univ. of California, Los Angeles, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)
Univ. of California, Irvine, CA (United States)
Univ. of Washington, Seattle, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Nova Photonics, Princeton, NJ (United States)
Univ. of California, Davis, CA (United States)
Princeton Univ., NJ (United States)
General Atomics, San Diego, CA (United States)
The College of New Jersey, Ewing, NJ (United States)
Johns Hopkins Univ., Baltimore, MD (United States)
Univ. of Tennessee, Knoxville, TN (United States)
X Science LLC, Plainsboro, NJ (United States)
College of William and Mary, Williamsburg, VA (United States)
Lodestar Research Corporation, Boulder, CO (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Lehigh Univ., Bethlehem, PA (United States)

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 ~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,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. Finally, 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.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344

OSTI ID:: 1367916

Alternate ID(s):: OSTI ID: 1888627
OSTI ID: 22925862

Report Number(s):: LLNL-JRNL-840085

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 10 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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