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Title: Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST

Recent experiments on EAST have achieved the first long pulse H-mode (61 s) with zero loop voltage and an ITER-like tungsten divertor, and have demonstrated access to broad plasma current profiles by increasing the density in fully-noninductive lower hybrid current-driven discharges. These long pulse discharges reach wall thermal and particle balance, exhibit stationary good confinement (H 98y2~1.1) with low core electron transport, and are only possible with optimal active cooling of the tungsten armors. In separate experiments, the electron density was systematically varied in order to study its effect on the deposition profile of the external lower hybrid current drive (LHCD), while keeping the plasma in fully-noninductive conditions and with divertor strike points on the tungsten divertor. A broadening of the current profile is found, as indicated by lower values of the internal inductance at higher density. A broad current profile is attractive because, among other reasons, it enables internal transport barriers at large minor radius, leading to improved confinement as shown in companion DIII-D experiments. These experiments strengthen the physics basis for achieving high performance, steady state discharges in future burning plasmas.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [2] ;  [4] ;  [2] ;  [6] ;  [2] ;  [1] ;  [1] ;  [1] more »;  [2] ;  [2] ;  [7] ;  [8] ;  [2] ;  [3] ;  [1] ;  [2] ;  [2] « less
  1. General Atomics, San Diego, CA (United States)
  2. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  4. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  8. Alternative Energies and Atomic Energy Commission (CEA), Saint-Paul-Les-Durance Cedex (France). Inst. de Recherche sur la Fusion par confinement Magnetique (IRFM)
Publication Date:
Grant/Contract Number:
FC02-04ER54698; SC0010685; SC0010492; FG02-01ER54615; AC02-09CH11466; AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 7; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetic fusion; steady-state tokamak; current profile control; lower hybrid
OSTI Identifier:
1374823

Garofalo, Andrea M., Gong, X. Z., Qian, J., Chen, J., Li, G., Li, K., Li, M. H., Zhai, X., Bonoli, P., Brower, D., Cao, L., Cui, L., Ding, S., Ding, W. X., Guo, W., Holcomb, Christopher, Huang, J., Hyatt, Alan, Lanctot, Matthew, Lao, Lang L., Liu, H., Lyu, B., McClenaghan, J., Peysson, Y., Ren, Q., Shiraiwa, S., Solomon, Wayne, Zang, Q., and Wan, B.. Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST. United States: N. p., Web. doi:10.1088/1741-4326/aa7186.
Garofalo, Andrea M., Gong, X. Z., Qian, J., Chen, J., Li, G., Li, K., Li, M. H., Zhai, X., Bonoli, P., Brower, D., Cao, L., Cui, L., Ding, S., Ding, W. X., Guo, W., Holcomb, Christopher, Huang, J., Hyatt, Alan, Lanctot, Matthew, Lao, Lang L., Liu, H., Lyu, B., McClenaghan, J., Peysson, Y., Ren, Q., Shiraiwa, S., Solomon, Wayne, Zang, Q., & Wan, B.. Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST. United States. doi:10.1088/1741-4326/aa7186.
Garofalo, Andrea M., Gong, X. Z., Qian, J., Chen, J., Li, G., Li, K., Li, M. H., Zhai, X., Bonoli, P., Brower, D., Cao, L., Cui, L., Ding, S., Ding, W. X., Guo, W., Holcomb, Christopher, Huang, J., Hyatt, Alan, Lanctot, Matthew, Lao, Lang L., Liu, H., Lyu, B., McClenaghan, J., Peysson, Y., Ren, Q., Shiraiwa, S., Solomon, Wayne, Zang, Q., and Wan, B.. 2017. "Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST". United States. doi:10.1088/1741-4326/aa7186. https://www.osti.gov/servlets/purl/1374823.
@article{osti_1374823,
title = {Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST},
author = {Garofalo, Andrea M. and Gong, X. Z. and Qian, J. and Chen, J. and Li, G. and Li, K. and Li, M. H. and Zhai, X. and Bonoli, P. and Brower, D. and Cao, L. and Cui, L. and Ding, S. and Ding, W. X. and Guo, W. and Holcomb, Christopher and Huang, J. and Hyatt, Alan and Lanctot, Matthew and Lao, Lang L. and Liu, H. and Lyu, B. and McClenaghan, J. and Peysson, Y. and Ren, Q. and Shiraiwa, S. and Solomon, Wayne and Zang, Q. and Wan, B.},
abstractNote = {Recent experiments on EAST have achieved the first long pulse H-mode (61 s) with zero loop voltage and an ITER-like tungsten divertor, and have demonstrated access to broad plasma current profiles by increasing the density in fully-noninductive lower hybrid current-driven discharges. These long pulse discharges reach wall thermal and particle balance, exhibit stationary good confinement (H98y2~1.1) with low core electron transport, and are only possible with optimal active cooling of the tungsten armors. In separate experiments, the electron density was systematically varied in order to study its effect on the deposition profile of the external lower hybrid current drive (LHCD), while keeping the plasma in fully-noninductive conditions and with divertor strike points on the tungsten divertor. A broadening of the current profile is found, as indicated by lower values of the internal inductance at higher density. A broad current profile is attractive because, among other reasons, it enables internal transport barriers at large minor radius, leading to improved confinement as shown in companion DIII-D experiments. These experiments strengthen the physics basis for achieving high performance, steady state discharges in future burning plasmas.},
doi = {10.1088/1741-4326/aa7186},
journal = {Nuclear Fusion},
number = 7,
volume = 57,
place = {United States},
year = {2017},
month = {6}
}