Linear systems description of the CO[sub 2] laser-based tangential imaging system (abstract)

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146295· OSTI ID:6700421

Lo, E; Wright, J; Nazikian, R ^[1]

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1. Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543-0451 (United States)

It is demonstrated that the phase variation produced by the projection of the density fluctuations onto a laser beam that is aligned tangent to the magnetic field lines in a toroidal plasma, is in fact a convolution of the density fluctuation profile in the tangency plane with a shift-invariant point spread function. Thus a spatial filter can be used to invert the corresponding transfer function to produce an undistorted image of the plasma density fluctuations at the tangency plane. Numerical simulations demonstrate that a spatial filter consisting of a simple and versatile step-function form of a Zernike phase mirror, will recover a reasonably accurate image of the fluctuations [Lo [ital et] [ital al]., Buld. APS [bold 38], 2005 (1993)].

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6700421
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 66:1; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CARBON DIOXIDE LASERS
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
GAS LASERS
IMAGE PROCESSING
INFRARED RADIATION
LASER SPECTROSCOPY
LASERS
PLASMA DIAGNOSTICS
PROCESSING
RADIATIONS
SIMULATION
SPECTROSCOPY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TWO-DIMENSIONAL CALCULATIONS
VARIATIONS