2D turbulence imaging in DIII-D via beam emission spectroscopy

Journal Article · Mon Jan 01 00:00:00 EST 2001 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1321739· OSTI ID:40204881

Fenzi, C; Fonck, R J; Jakubowski, M; Mc Kee, G R

Two-dimensional measurements of density fluctuations have been performed in DIII-D using the beam emission spectroscopy diagnostic. The 32 spatial channels are arranged to image a 5x6cm{sup 2} (radialxpoloidal) region in the plasma cross section, at a nominal 1 cm spatial resolution and separation. The typical decorrelation time, poloidal and radial correlation lengths, as well as a time-averaged flow field plot are obtained from spatial and temporal correlation analyses. A biorthogonal decomposition algorithm is applied to expand the data set into a set of modes that are orthogonal in time and in space, thus providing a simultaneous analysis of the space and time dependencies of fluctuation data.

• Sponsoring Organization: (US)
• OSTI ID: 40204881
• Journal Information: Review of Scientific Instruments, Vol. 72, Issue 1; Other Information: Othernumber: RSINAK000072000001000988000001; 648101CON; PBD: Jan 2001; ISSN 0034-6748
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALGORITHMS
CROSS SECTIONS
DOUBLET-3 DEVICE
EMISSION SPECTROSCOPY
FLUCTUATIONS
PHYSICS
PLASMA
SPATIAL RESOLUTION
TURBULENCE