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Title: Overview of NSTX Upgrade Initial Results and Modelling Highlights

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, H-Mode accessed, magnetic error fields identified and mitigated, and the first physics research campaign carried out. During 10 run weeks of operation, NSTX-U surpassed NSTX-record pulse-durations and toroidal fields, and high-performance ~1MA 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 H98y2 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 themore » Disruption Event Characterization and Forecasting (DECAF) code. Lastly, the Materials Analysis and Particle Probe (MAPP) 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. « less
Authors:
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  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Columbia University, New York, NY, United States of America
  3. Lawrence Livermore National Laboratory, Livermore, CA, United States of America
  4. University of Wisconsin, Madison, WI, United States of America
  5. X Science LLC, Plainsboro, NJ, United States of America
  6. Johns Hopkins University, Baltimore, MD, United States of America
Publication Date:
DOE Contract Number:
AC02-09CH11466
Product Type:
Dataset
Research Org(s):
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Resource Relation:
Related Information: Nuclear Fusion, vol. 57, 102006 (June 2017)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; NSTX-U; Spherical tokamak; Alfven Eigenmodes
Related Identifiers:
OSTI Identifier:
1367890

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., Barchfield, R., Beiersdorfer, P., Bertelli, N., Bhattacharjee, A., Boyle, D., 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., LaHaye, R.J., Levinton, F., Luhmann Jr., 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., and Zweben, S.J.. Overview of NSTX Upgrade Initial Results and Modelling Highlights. United States: N. p., Web. doi:10.11578/1367890.
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., Barchfield, R., Beiersdorfer, P., Bertelli, N., Bhattacharjee, A., Boyle, D., 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., LaHaye, R.J., Levinton, F., Luhmann Jr., 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. United States. doi:10.11578/1367890.
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., Barchfield, R., Beiersdorfer, P., Bertelli, N., Bhattacharjee, A., Boyle, D., 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., LaHaye, R.J., Levinton, F., Luhmann Jr., 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., and Zweben, S.J.. 2017. "Overview of NSTX Upgrade Initial Results and Modelling Highlights". United States. doi:10.11578/1367890. https://www.osti.gov/servlets/purl/1367890.
@misc{osti_1367890,
title = {Overview of NSTX Upgrade Initial Results and Modelling Highlights},
author = {Menard, J.E. and Allain, J.P. and Battaglia, D.J. and Bedoya, F. and Bell, R.E. and Belova, E. and Berkery, J.W. and Boyer, M.D. and Crocker, N. and Diallo, A. and Ebrahimi, F. and Ferraro, N. and Fredrickson, E. and Frerichs, H. and Gerhardt, S. and Gorelenkov, N. and Guttenfelder, W. and Heidbrink, W. and Kaita, R. and Kaye, S.M. and Kriete, D.M. and Kubota, S. and LeBlanc, B.P. and Liu, D. and Lunsford, R. and Mueller, D. and Myers, C.E. and Ono, M. and Park, J-K. and Podesta, M. and Raman, R. and Reinke, M. and Ren, Y. and Sabbagh, S.A. and Schmitz, O. and Scotti, F. and Sechrest, Y. and Skinner, C.H. and Smith, D.R. and Soukhanovskii, V. and Stoltzfus-Dueck, T. and Yuh, H. and Wang, Z. and Waters, I. and Ahn, J-W. and Andre, R. and Barchfield, R. and Beiersdorfer, P. and Bertelli, N. and Bhattacharjee, A. and Boyle, D. and Brennan, D. and Buttery, R. and Capece, A. and Canal, G. and Canik, J. and Chang, C.S. and Darrow, D. and Delgado-Aparicio, L. and Domier, C. and Ethier, S. and Evans, T. and Ferron, J. and Finkenthal, M. and Fonck, R. and Gan, K. and Gates, D. and Goumiri, I. and Gray, T. and Hosea, J. and Humphreys, D. and Jarboe, T. and Jardin, S. and Jaworski, M.A. and Koel, B. and Kolemen, E. and Ku, S. and LaHaye, R.J. and Levinton, F. and Luhmann Jr., N. and Maingi, R. and Maqueda, R. and McKee, G. and Meier, E. and Myra, J. and Perkins, R. and Poli, F. and Rhodes, T. and Riquezes, J. and Rowley, C. and Russell, D. and Schuster, E. and Stratton, B. and Stutman, D. and Taylor, G. and Tritz, K. and Wang, W. and Wirth, B. and Zweben, S.J.},
abstractNote = {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, H-Mode accessed, magnetic error fields identified and mitigated, and the first physics research campaign carried out. During 10 run weeks of operation, NSTX-U surpassed NSTX-record pulse-durations and toroidal fields, and high-performance ~1MA 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 H98y2 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 (DECAF) code. Lastly, the Materials Analysis and Particle Probe (MAPP) 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.},
doi = {10.11578/1367890},
year = {2017},
month = {1} }
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