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Title: Comparison of edge turbulence imaging at two different poloidal locations in the scrape-off layer of Alcator C-Mod

This paper describes 2D imaging measurements of plasma turbulence made in the scrape-off layer of the Alcator C-Mod tokamak simultaneously at two different poloidal locations, one near the outer midplane and the other near the divertor X-point region. These images were made with radial and poloidal resolution using two gas puff imaging diagnostics not directly connected along a B field line. The turbulence correlation structure has a significantly different tilt angle with respect to the local flux surfaces for the midplane and X-regions, and a slightly different ellipticity and size. The time-averaged turbulence velocities can be different in the midplane and X-regions, even within the same flux surface in the same shot. The structures are partially consistent with a magnetic flux tube mapping model, and the velocities are compared with various models for turbulence flow.
Authors:
; ; ; ;  [1] ; ; ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540 (United States)
  2. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  3. Consorzio RFX, Associazione Euratom-ENEA sulla fusione, C.so Stati Uniti 4, I-3512 Padova (Italy)
  4. Max Planck Institute for Plasma Physics, EURATOM Association, D-17491 Greifswald (Germany)
  5. Lodestar Research Corporation, 2400 Central Ave., Boulder, Colorado 80301 (United States)
  6. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
Publication Date:
OSTI Identifier:
22227948
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALCATOR DEVICE; COMPARATIVE EVALUATIONS; CORRELATIONS; DIVERTORS; MAGNETIC FLUX; MAGNETIC SURFACES; MAGNETOHYDRODYNAMICS; PLASMA CONFINEMENT; PLASMA DIAGNOSTICS; PLASMA SCRAPE-OFF LAYER; THERMONUCLEAR REACTORS; TURBULENCE