Overview of NSTX Upgrade initial results and modelling highlights

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

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

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 H98y,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.

Original languageEnglish (US)
Article number102006
JournalNuclear Fusion
Volume57
Issue number10
DOIs
StatePublished - Jun 20 2017

Fingerprint

forecasting
beam injection
neutral beams
multipliers
ion temperature
summer
temperature gradients
ions
pulse duration
turbulence
physics
probes
electrons

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Menard, J. E., Allain, J. P., Battaglia, D. J., Bedoya, F., Bell, R. E., Belova, E., ... Zweben, S. J. (2017). Overview of NSTX Upgrade initial results and modelling highlights. Nuclear Fusion, 57(10), [102006]. https://doi.org/10.1088/1741-4326/aa600a
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. / Overview of NSTX Upgrade initial results and modelling highlights. In: Nuclear Fusion. 2017 ; Vol. 57, No. 10.
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abstract = "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 H98y,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.",
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Menard, JE, Allain, JP, Battaglia, DJ, Bedoya, F, Bell, RE, Belova, E, Berkery, JW, Boyer, MD, Crocker, N, Diallo, A, Ebrahimi, F, Ferraro, N, Fredrickson, E, Frerichs, H, Gerhardt, S, Gorelenkov, N, Guttenfelder, W, Heidbrink, W, Kaita, R, Kaye, SM, Kriete, DM, Kubota, S, Leblanc, BP, Liu, D, Lunsford, R, Mueller, D, Myers, CE, Ono, M, Park, JK, Podesta, M, Raman, R, Reinke, M, Ren, Y, Sabbagh, SA, Schmitz, O, Scotti, F, Sechrest, Y, Skinner, CH, Smith, DR, Soukhanovskii, V, Stoltzfus-Dueck, T, Yuh, H, Wang, Z, Waters, I, Ahn, JW, Andre, R, Barchfeld, R, Beiersdorfer, P, Bertelli, N, Bhattacharjee, A, Brennan, D, Buttery, R, Capece, A, Canal, G, Canik, J, Chang, CS, 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, MA, Koel, B, Kolemen, E, Ku, S, La Haye, RJ, 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, SJ 2017, 'Overview of NSTX Upgrade initial results and modelling highlights', Nuclear Fusion, vol. 57, no. 10, 102006. https://doi.org/10.1088/1741-4326/aa600a

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.

In: Nuclear Fusion, Vol. 57, No. 10, 102006, 20.06.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Overview of NSTX Upgrade initial results and modelling highlights

AU - Menard, J. E.

AU - Allain, J. P.

AU - Battaglia, D. J.

AU - Bedoya, F.

AU - Bell, R. E.

AU - Belova, E.

AU - Berkery, J. W.

AU - Boyer, M. D.

AU - Crocker, N.

AU - Diallo, A.

AU - Ebrahimi, F.

AU - Ferraro, N.

AU - Fredrickson, E.

AU - Frerichs, H.

AU - Gerhardt, S.

AU - Gorelenkov, N.

AU - Guttenfelder, W.

AU - Heidbrink, W.

AU - Kaita, R.

AU - Kaye, S. M.

AU - Kriete, D. M.

AU - Kubota, S.

AU - Leblanc, B. P.

AU - Liu, D.

AU - Lunsford, R.

AU - Mueller, D.

AU - Myers, C. E.

AU - Ono, M.

AU - Park, J. K.

AU - Podesta, M.

AU - Raman, R.

AU - Reinke, M.

AU - Ren, Y.

AU - Sabbagh, S. A.

AU - Schmitz, O.

AU - Scotti, F.

AU - Sechrest, Y.

AU - Skinner, C. H.

AU - Smith, D. R.

AU - Soukhanovskii, V.

AU - Stoltzfus-Dueck, T.

AU - Yuh, H.

AU - Wang, Z.

AU - Waters, I.

AU - Ahn, J. W.

AU - Andre, R.

AU - Barchfeld, R.

AU - Beiersdorfer, P.

AU - Bertelli, N.

AU - Bhattacharjee, A.

AU - Brennan, D.

AU - Buttery, R.

AU - Capece, A.

AU - Canal, G.

AU - Canik, J.

AU - Chang, C. S.

AU - Darrow, D.

AU - Delgado-Aparicio, L.

AU - Domier, C.

AU - Ethier, S.

AU - Evans, T.

AU - Ferron, J.

AU - Finkenthal, M.

AU - Fonck, R.

AU - Gan, K.

AU - Gates, D.

AU - Goumiri, I.

AU - Gray, T.

AU - Hosea, J.

AU - Humphreys, D.

AU - Jarboe, T.

AU - Jardin, S.

AU - Jaworski, M. A.

AU - Koel, B.

AU - Kolemen, E.

AU - Ku, S.

AU - La Haye, R. J.

AU - Levinton, F.

AU - Luhmann, N.

AU - Maingi, R.

AU - Maqueda, R.

AU - McKee, G.

AU - Meier, E.

AU - Myra, J.

AU - Perkins, R.

AU - Poli, F.

AU - Rhodes, T.

AU - Riquezes, J.

AU - Rowley, C.

AU - Russell, D.

AU - Schuster, E.

AU - Stratton, B.

AU - Stutman, D.

AU - Taylor, G.

AU - Tritz, K.

AU - Wang, W.

AU - Wirth, B.

AU - Zweben, S. J.

PY - 2017/6/20

Y1 - 2017/6/20

N2 - 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 H98y,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.

AB - 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 H98y,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.

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UR - http://www.scopus.com/inward/citedby.url?scp=85028447945&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/aa600a

DO - 10.1088/1741-4326/aa600a

M3 - Article

AN - SCOPUS:85028447945

VL - 57

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 10

M1 - 102006

ER -

Menard JE, Allain JP, Battaglia DJ, Bedoya F, Bell RE, Belova E et al. Overview of NSTX Upgrade initial results and modelling highlights. Nuclear Fusion. 2017 Jun 20;57(10). 102006. https://doi.org/10.1088/1741-4326/aa600a