Comparison of Scrape-off Layer Turbulence in Alcator C-Mod with Three Dimensional Gyrofluid Computations
S.J. Zweben, B.D. Scott, J.L. Terry, B. LaBombard, J.W. Hughes, and D.P. Stotler
United States. Department of Energy. Office of Science.
Princeton University. Plasma Physics Laboratory.
2009-09-01
English
This paper describes quantitative comparisons between turbulence measured in the scrape-off layer (SOL) of Alcator C-Mod [S. Scott, A. Bader, M. Bakhtiari et al., Nucl. Fusion 47, S598 (2007)] and three dimensional computations using electromagnetic gyrofluid equations in a two-dimensional tokamak geometry. These comparisons were made for the outer midplane SOL for a set of inner-wall limited, near-circular Ohmic plasmas. The B field and plasma density were varied to assess gyroradius and collisionality scaling. The poloidal and radial correlation lengths in the experiment and computation agreed to within a factor of 2 and did not vary significantly with either B or density. The radial and poloidal propagation speeds and the frequency spectra and poloidal k-spectra also agreed fairly well. However, the autocorrelation times and relative Da fluctuation levels were higher in the experiment by more than a factor of 2. Possible causes for these disagreements are discussed. 2009 American Institute of Physics.
Scrape-Off Layer (Sol), Turbulence, Tokamaks
Spectra
70 Plasma Physics And Fusion Technology
Geometry
Plasma Density
Fluctuations
Turbulence Scrape-Off Layer (Sol), Turbulence, Tokamaks
Sols
Report
289Kb
Text
rep-no: PPPL-4438
grantno: DE-ACO2-09CH11466
osti: 963546
https://digital.library.unt.edu/ark:/67531/metadc931917/
ark: ark:/67531/metadc931917