论文信息 - Tomography of neutral beams

Tomography of neutral beams

This paper describes a new diagnostic technique to decode information contained in the spectral and spatial distribution of photons emitted by fast neutral beam particles and provide an estimate of the 2‐D beam density distribution function in a cross‐sectional slice. By scanning Doppler‐shifted Hα radiation from the fast beam particles at a number of peripheral locations around the beam axis, tomographic reconstructions of the beam distribution with spatial resolution Δx≂2 cm and time resolution Δt≂10 ms can be made. Using a maximum entropy reconstruction algorithm (making no symmetry assumptions), experimental reconstructions are presented of the 2‐D profile of the beam generated by the prototype JET source for each of the Doppler‐shifted line radiation components. Applications of this image processing technique in other areas of high‐temperature plasma diagnostic development are discussed briefly.

G. A. Cottrell

[1] G. Bracco,et al. Doppler spectroscopy on high power neutral beams , 1982 .

[2] Soft X-Ray Tomography of the m =2 Magnetic Island Structure in the JIPP T-II Tokamak , 1981 .

[3] B R Myers,et al. Two-dimensional spectral line emission reconstruction as a plasma diagnostic. , 1978, The Review of scientific instruments.

[4] Geoff Gillman,et al. Reconstruction of X-ray sources from penumbral images , 1979 .

[5] S. Gull,et al. Image reconstruction from incomplete and noisy data , 1978, Nature.

[6] G. Cottrell. Optical profilometry of intense neutral beams , 1982 .

[7] D. J. De Rosier,et al. Reconstruction of Three Dimensional Structures from Electron Micrographs , 1968, Nature.

[8] Doppler-shift emission tomography of intense neutral beams , 1982 .

[9] K. Kawahata,et al. Soft X-ray tomography in the JIPP T-II stellarator , 1982 .

[10] Gabor T. Herman,et al. Image Reconstruction From Projections , 1975, Real Time Imaging.

[11] R. R. Smith,et al. Doppler shift spectroscopy of powerful neutral beams , 1980 .

[12] Rodney W. Johnson,et al. Axiomatic derivation of the principle of maximum entropy and the principle of minimum cross-entropy , 1980, IEEE Trans. Inf. Theory.