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Physics and performance of the I-mode regime over an expanded operating space on Alcator C-Mod
Hubbard, A. E.1; Baek, S. -G.1; Brunner, D.1; Creely, A. J.1; Cziegler, I.2; Edlund, E.1; Hughes, J. W.1; LaBombard, B.1; Lin, Y.1; Liu, Z.3,4; Marmar, E. S.1; Reinke, M. L.5; Rice, J. E.1; Sorbom, B.1; Sung, C.6; Terry, J.1; Theiler, C.7; Tolman, E. A.1; Walk, J. R.1; White, A. E.1; Whyte, D.1; Wolfe, S. M.1; Wukitch, S.1; Xu, X. Q.4; Alcator C-Mod team
2017-12-01
Source PublicationNUCLEAR FUSION
Volume57Issue:12
AbstractNew results on the I-mode regime of operation on the Alcator C-Mod tokamak are reported. This ELM-free regime features high energy confinement and a steep temperature pedestal, while particle confinement remains at L-mode levels, giving stationary density and avoiding impurity accumulation. I-mode has now been obtained over nearly all of the magnetic fields and currents possible in this high field tokamak (I-p 0.55-1.7 MA, B-T 2.8-8 T) using a configuration with B x del B drift away from the X-point. Results at 8 T confirm that the L-I power threshold varies only weakly with B-T, and that the power range for I-mode increases with B-T; no 8 T discharges transitioned to H-mode. Parameter dependences of energy confinement are investigated. Core transport simulations are giving insight into the observed turbulence reduction, profile stiffness and confinement improvement. Pedestal models explain the observed stability to ELMs, and can simulate the observed weakly coherent mode. Conditions for I-H transitions have complex dependences on density as well as power. I-modes have now been maintained in near-DN configurations, leading to improved divertor power flux sharing. Prospects for I-mode on future fusion devices such as ITER and ARC are encouraging. Further experiments on other tokamaks are needed to improve confidence in extrapolation.
SubtypeArticle
KeywordFec 2016 Tokamak I-mode Pedestal Transport
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationU.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; National Natural Science Foundation of China(11405217) ; National Natural Science Foundation of China(11405217) ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; National Natural Science Foundation of China(11405217) ; National Natural Science Foundation of China(11405217)
DOI10.1088/1741-4326/aa8570
Indexed BySCI
Language英语
Funding OrganizationU.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; National Natural Science Foundation of China(11405217) ; National Natural Science Foundation of China(11405217) ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod(DE-FC02-99ER54512-CMOD) ; National Natural Science Foundation of China(11405217) ; National Natural Science Foundation of China(11405217)
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS IDWOS:000412386300001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/33717
Collection中科院等离子体物理研究所
Affiliation1.MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA
2.Univ York, Dept Phys, York Plasma Inst, York, N Yorkshire, England
3.Chinese Acad Sci, Inst Plasma Phys, Hefei, Anhui, Peoples R China
4.Lawrence Livermore Natl Lab, Livermore, CA USA
5.Oak Ridge Natl Lab, Oak Ridge, TN USA
6.Univ Calif Los Angeles, Los Angeles, CA USA
7.Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland
Recommended Citation
GB/T 7714
Hubbard, A. E.,Baek, S. -G.,Brunner, D.,et al. Physics and performance of the I-mode regime over an expanded operating space on Alcator C-Mod[J]. NUCLEAR FUSION,2017,57(12).
APA Hubbard, A. E..,Baek, S. -G..,Brunner, D..,Creely, A. J..,Cziegler, I..,...&Alcator C-Mod team.(2017).Physics and performance of the I-mode regime over an expanded operating space on Alcator C-Mod.NUCLEAR FUSION,57(12).
MLA Hubbard, A. E.,et al."Physics and performance of the I-mode regime over an expanded operating space on Alcator C-Mod".NUCLEAR FUSION 57.12(2017).
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