High resolution soft-x-ray tomography of sawtooth oscillations on the Tokamak de Varennes

Journal Article · Mon Jun 26 04:00:00 EDT 1989 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.62.3038· OSTI ID:5892550

Janicki, C; Decoste, R; Simm, C

Up to five arrays of soft-x-ray detectors are used with the Fourier-Bessel harmonic reconstruction method to generate 2D images of sawtooth collapses during ohmic plasma discharges on the Tokamak de Varennes. For low-harmonic reconstructions (/ital M/less than or equal to2), a quasi-interchange behavior (Wesson model) is observed during the sawtooth crash, but a reconnectionlike behavior (Kadomtsev model) is recovered using higher harmonics (/ital M/greater than or equal to3) on the same data. This indicates that the Kadomtsev model is a better description for the sawtooth collapse, although the collapse time remains shorter than predicted.

• Research Organization: Centre Canadien de Fusion Magnetique, Varennes, Quebec, Canada J0L 2P0(CA)
• OSTI ID: 5892550
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 62:26; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BESSEL FUNCTIONS
CLOSED PLASMA DEVICES
DIAGNOSTIC TECHNIQUES
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FOURIER ANALYSIS
FUNCTIONS
HARMONIC OSCILLATORS
IMAGES
IONIZING RADIATIONS
OSCILLATION MODES
OSCILLATORS
PLASMA
PLASMA DIAGNOSTICS
RADIATIONS
RESOLUTION
SOFT X RADIATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOMOGRAPHY
VARENNES TOKAMAK
X RADIATION
X-RAY EQUIPMENT