On the ρ*scaling of intrinsic rotation in C-Mod plasmas with edge transport barriers

Rice, J. E.; Hughes, J. W.; Diamond, P. H.; Cao, N.; Chilenski, M. A.; Hubbard, A. E.; Irby, J. H.; Kosuga, Y.; Lin, Y.; Metcalf, I. W.; Reinke, M. L.; Tolman, E. A.; Victora, M. M.; Wolfe, S. M.; Wukitch, S. J.

doi:10.1088/1741-4326/aa7b44

On the ρ_*scaling of intrinsic rotation in C-Mod plasmas with edge transport barriers

Journal Article · Fri Jul 28 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa7b44· OSTI ID:1894452

Rice, J. E. ^[1]; Hughes, J. W. ^[2]; Diamond, P. H. ^[3]; Cao, N. ^[2]; ^[2]; Hubbard, A. E. ^[2]; Irby, J. H. ^[2]; Kosuga, Y. ^[4]; Lin, Y. ^[2]; Metcalf, I. W. ^[2]; ^[5]; Tolman, E. A. ^[2]; Victora, M. M. ^[2]; Wolfe, S. M. ^[2]; Wukitch, S. J. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; OSTI
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Univ. of California, San Diego, CA (United States)
Kyushu Univ., Fukuoka (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, changes in the core intrinsic toroidal rotation velocity following L- to H- and L- to I-mode transitions have been investigated in Alcator C-Mod tokamak plasmas. The magnitude of the co-current rotation increments is found to increase with the pedestal temperature gradient and $$q_{95}$$ , and to decrease with toroidal magnetic field. These results are captured quantitatively by a model of fluctuation entropy balance which gives the Mach number $$M_i \cong \rho _*/2 L_s/L_T \sim \nabla T q_{95}/B_{T}$$ in an ITG turbulence dominant regime. The agreement between experiment and theory gives confidence for extrapolation to future devices in similar operational regimes. Core thermal Mach numbers of ~0.07 and ~0.2 are expected for ITER and ARC, respectively.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-99ER54512

OSTI ID:: 1894452

Alternate ID(s):: OSTI ID: 22925894

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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On the ρ_*scaling of intrinsic rotation in C-Mod plasmas with edge transport barriers