High speed movies of turbulence in Alcator C-Mod

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1789597· OSTI ID:20641272

Terry, J L; Zweben, S J; Bose, B; Grulke, O; Marmar, E S; Lowrance, J; Mastrocola, V; Renda, G ^[1]

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1. Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts 02139 (United States)

A high speed (250 kHz), 300 frame charge coupled device camera has been used to image turbulence in the Alcator C-Mod Tokamak. The camera system is described and some of its important characteristics are measured, including time response and uniformity over the field-of-view. The diagnostic has been used in two applications. One uses gas-puff imaging to illuminate the turbulence in the edge/scrape-off-layer region, where D{sub 2} gas puffs localize the emission in a plane perpendicular to the magnetic field when viewed by the camera system. The dynamics of the underlying turbulence around and outside the separatrix are detected in this manner. In a second diagnostic application, the light from an injected, ablating, high speed Li pellet is observed radially from the outer midplane, and fast poloidal motion of toroidal striations are seen in the Li{sup +} light well inside the separatrix.

• OSTI ID: 20641272
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 75; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
CHARGE-COUPLED DEVICES
FLUCTUATIONS
KHZ RANGE 100-1000
LITHIUM IONS
MAGNETIC FIELDS
PELLETS
PLASMA DIAGNOSTICS
PLASMA SCRAPE-OFF LAYER
TURBULENCE