Pseudotomographic fitting algorithm for density profile reconstruction from a sparse 1-D interferometer array

Journal Article · Fri Jul 01 00:00:00 EDT 1988 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1139727· OSTI ID:7056076

Casey, J A; Sevillano, E; Irby, J H; Lane, B G

An algorithm has been developed for fast analysis of a sparse multichord interferometer array, yielding peak density, Gaussian width, radial offset, ellipticity, and instability amplitude and frequency from line-integrated density measurements. A nonlinear least-squares fit is performed over many short time intervals, with independent variables reduced to one dimension. Assumptions of plasma rigidity and slowly evolving rotation rate are necessary to trade temporal resolution (on instability timescales) for spatial resolution across the moving plasma column. Results from the Tara tandem mirror experiment are shown.

• Research Organization: Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• OSTI ID: 7056076
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 59:7
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
INTERFEROMETRY
IMAGE PROCESSING
PLASMA DIAGNOSTICS
DATA ANALYSIS
INTERFEROMETERS
TARA DEVICES
ALGORITHMS
FORTRAN
LEAST SQUARE FIT
PLASMA DENSITY
RESOLUTION
MAGNETIC MIRRORS
MATHEMATICAL LOGIC
MAXIMUM-LIKELIHOOD FIT
MEASURING INSTRUMENTS
NUMERICAL SOLUTION
OPEN PLASMA DEVICES
PROCESSING
PROGRAMMING LANGUAGES
TANDEM MIRRORS
THERMONUCLEAR DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics