Comparison of 3D flux-driven scrape-off layer turbulence simulations with gas-puff imaging of Alcator C-Mod inner-wall limited discharges. (15th April 2015)

• Record Type: Journal Article
• Authors: Halpern, F D; Terry, J L; Zweben, S J; LaBombard, B; Podesta, M; Ricci, P
• Is Part Of: Plasma physics and controlled fusion. Volume 57:Number 5(2015:May)
• Publication Date: 2015-04-15
• Subjects: turbulence -- gas-puff imaging -- flux-driven -- scrape-off layer; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/0741-3335/57/5/054005
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: We carry out a quantitative comparison between gas-puff imaging (GPI) turbulence measurements in Alcator C-Mod inner-wall limited discharges (Zweben et al 2009 Phys. Plasmas 18 082505) and 3D flux-driven drift-reduced Braginskii turbulence simulations of scrape-off layer dynamics. The comparison is carried out for a series of inner-wall limited discharges where the magnetic field and the density are varied. The comparison between GPI data and non-linear simulations yields overall good agreement for several observables, such as the D α emission levels and intermittency, the radial and poloidal correlation lengths and propagation velocities, and the power and frequency spectral density.