A procedure for generating quantitative 3-D camera views of tokamak divertors Page: 1 of 24
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PPPL-3187 - Preprint: May 1996, UC-420, 426
A Procedure for Generating Quantitative 3-D Camera Views
of Tokamak Divertors.
P. H. Edmonds, \%
Fusion Research Center,
University of Texas at Austin, [ 2
Austin Texas, 08543
S. S. Medley,
Princeton Plasma Physics Laboratory,
P. O. Box 451, Princeton, New Jersey, 08543
Abstract
A procedure is described for precision modeling of the views for imaging
diagnostics monitoring tokamak internal components, particularly high heat flux
divertor components. These models are required to enable predictions of
resolution and viewing angle for the available viewing locations. Because of the
oblique views expected for slot divertors, fully 3-D perspective imaging is
required. A suite of matched 3-D CAD, graphics and animation applications are
used to provide a fast and flexible technique for reproducing these views. An
analytic calculation of the resolution and viewing incidence angle is developed to
validate the results of the modeling procedures. The calculation is applicable to
any viewed surface describable with a coordinate array. The Tokamak Physics
Experiment (TPX) diagnostics [1] for infrared viewing are used as an example to
demonstrate the implementation of the tools. For the TPX experiment the
available locations are severely constrained by access limitations and the
resulting images are marginal in both resolution and viewing incidence angle.
Full coverage of the divertor is possible if an array of cameras is installed at 45
degree toroidal intervals. Two poloidal locations are required in order to view
both the upper and lower divertors. The procedures described here provide a
complete design tool for in-vessel viewing, both for camera location and for
identification of viewed surfaces. Additionally these same tools can be used for
the interpretation of the actual images obtained by the actual diagnostic.
1. Introduction
The very high heat loads on the TPX divertor targets require continuous
temperature monitoring to anticipate and correct for any damaging fault
conditions [2, 3]. This monitoring will be done using infra-red cameras optically
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Edmonds, P. H. & Medley, S. S. A procedure for generating quantitative 3-D camera views of tokamak divertors, report, May 1, 1996; Princeton, New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc664064/m1/1/: accessed April 22, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.