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Abstract

In order to control the puffing of impurities (neon and argon) and deuterium gas in the main plasma chamber for experiments with a radiative boundary, a fast online determination of the total radiated power from the plasma for a feedback control is required. The total radiated power is normally calculated by a deconvolution of measurements of a horizontal bolometer camera with 40 lines of sight. This time-consuming algorithm, which works under the assumption of constant emissivity on closed flux surfaces, cannot be used online during the experiment to reach the so called CDH-mode. By means of a singular value decomposition a subset of 10 and 18 channels of the horizontal bolometric camera system is chosen for online reconstruction of the radiated power. A new nontrivial selection scheme was established for this purpose. With this subset a regression analysis against the offline calculated power was done. The regression coefficients are then used for a weighted sum over the selected subset of lines of sight to predict the total radiated power online during the discharge.

Additional information

Authors: MARASCHEK M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);FUCHS J C, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);MAST F, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);MERTENS V, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ZOHM H, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 1/297 EN (1996 ) 13pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
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