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

Title: 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. ^[1]; Diamond, P. H. ^[2]; Cao, N. ^[1];

^[1]; Hubbard, A. E. ^[1]; Irby, J. H. ^[1]; Kosuga, Y. ^[3]; Lin, Y. ^[1]; Metcalf, I. W. ^[1];

^[4]; Tolman, E. A. ^[1]; Victora, M. M. ^[1]; Wolfe, S. M. ^[1]; Wukitch, S. J. ^[1]

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.

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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; FC02-04ER54738

OSTI ID:: 1894452

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

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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