Edge Turbulence Imaging in the Alcator C-Mod Tokamak

Zweben, S.J. ; Stotler, D.P. ; Terry, J.L. ; LaBombard, B. ; Greenwald, M. ; Muterspaugh, M. ; Pitcher, C.S. ; Group, the Alcator C-Mod ; Hallatschek, K. ; Maqueda, R.J. ; Rogers, B. ; Lowrance, J.L. ; Mastrocola, V.J. ; Renda, G.F.

Princeton University. Plasma Physics Laboratory.

关键词: Alcator Device;    Cameras;    Plasma Diagnostics;    70 Plasma Physics And Fusion Technology;    Computerized Simulation;   

DOI  :  10.2172/792843
RP-ID  :  PPPL-3631
RP-ID  :  AC02-76CH03073
RP-ID  :  792843

美国|英语

来源: UNT Digital Library

【 摘 要 】

The 2-D radial vs. poloidal structure of edge turbulence in the Alcator C-Mod tokamak [I.H. Hutchinson, R. Boivin, P.T. Bonoli et al., Nuclear Fusion 41(2001) 1391] was measured using fast cameras and compared with 3-D numerical simulations of edge plasma turbulence. The main diagnostic is Gas Puff Imaging (GPI), in which the visible D(subscript alpha) emission from a localized D(subscript 2) gas puff is viewed along a local magnetic field line. The observed D(subscript alpha) fluctuations have a typical radial and poloidal scale of approximately 1 cm, and often have strong local maxima (''blobs'') in the scrape-off layer. The motion of this 2-D structure motion has also been measured using an ultra-fast framing camera with 12 frames taken at 250,000 frames/sec. Numerical simulations produce turbulent structures with roughly similar spatial and temporal scales and transport levels as that observed in the experiment; however, some differences are also noted, perhaps requiring diagnostic improvement and/or additional physics in the numerical model.