Soft x-ray tomography on TFTR
The tomographic method used for deriving soft x-ray local emissivities on TFTR, using one horizontal array of 60 soft x-ray detectors, is described. This method, which is based on inversion of Fourier components and subsequent reconstruction, has been applied to the study of a sawtooth crash. A flattening in the soft x-ray profile, which we interpret as an m = 1 island, is clearly visible during the precursor phase and its location and width correlate well with those from electron temperature profiles reconstructed from electron cyclotron emission measurement. The limitations of the Fourier method, due notably to the aperiodic nature of the signals in the fast crash phase and the difficulty of obtaining accurately the higher Fourier harmonics, are discussed. 9 refs., 13 figs.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6433076
- Report Number(s):
- PPPL-2555; ON: DE89006858
- Country of Publication:
- United States
- Language:
- English
Similar Records
2-D time evolution of T/sub e/ during sawtooth crash based on fast ECE (electron cyclotron emission) measurements on TFTR
Tomography on tokamak fusion test reactor
Related Subjects
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700107* -- Fusion Energy-- Plasma Research-- Instabilities
COMPUTERIZED SIMULATION
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
INSTABILITY
IONIZING RADIATIONS
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
RADIATIONS
SIMULATION
SOFT X RADIATION
TEMPERATURE DISTRIBUTION
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
TOMOGRAPHY
X RADIATION