A video camera system has been installed on the DIII-D tokamak for two-dimensional spatial studies of line emission in the lower divertor region. The system views the divertor tangentially at approximately the height of the X point through an outer port. At the tangency plane, the entire divertor from the inner wall to outside the DIII-D bias ring is viewed with spatial resolution of ∼1 cm. The image contains information from ∼90 deg of toroidal angle. In a recent upgrade, remotely controllable filter changers were added which have produced images from nominally identical discharges using different spectral lines. Software was developed to calculate the response function matrix of the optical system using distributed computing techniques and assuming toroidal symmetry. Standard sparse matrix algorithms are then used to invert the three-dimensional images onto a poloidal plane. Spatial resolution of the inverted images is 2 cm; higher resolution simply increases the size of the response function matrix. Initial results from a series of experiments with multiple identical discharges show that the emission from C II and C III, which appears along the inner scrape-off layer above and below the X point during ELMing H mode, moves outward and becomes localized near the X point in radiative divertor operation induced by deuterium injection.
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January 1997
Proceedings of the eleventh topical conference on high temperature plasma diagnostics
12-16 May 1996
Monterey, California (USA)
Research Article|
January 01 1997
A tangentially viewing visible TV system for the DIII-D divertor
M. E. Fenstermacher;
M. E. Fenstermacher
Lawrence Livermore National Laboratory, Livermore, California
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W. H. Meyer;
W. H. Meyer
Lawrence Livermore National Laboratory, Livermore, California
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R. D. Wood;
R. D. Wood
Lawrence Livermore National Laboratory, Livermore, California
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D. G. Nilson;
D. G. Nilson
Lawrence Livermore National Laboratory, Livermore, California
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R. Ellis;
R. Ellis
Lawrence Livermore National Laboratory, Livermore, California
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N. H. Brooks
N. H. Brooks
General Atomics, San Diego, California 92186-9784
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M. E. Fenstermacher
W. H. Meyer
R. D. Wood
D. G. Nilson
R. Ellis
N. H. Brooks
Lawrence Livermore National Laboratory, Livermore, California
Rev. Sci. Instrum. 68, 974–977 (1997)
Citation
M. E. Fenstermacher, W. H. Meyer, R. D. Wood, D. G. Nilson, R. Ellis, N. H. Brooks; A tangentially viewing visible TV system for the DIII-D divertor. Rev. Sci. Instrum. 1 January 1997; 68 (1): 974–977. https://doi.org/10.1063/1.1147729
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