Online Determination of Total Radiated Power by Bolometric Cameras with Statistical Methods
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.
Bibliographic Reference: Report: IPP 1/297 EN (1996 ) 13pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
Record Number: 199610711 / Last updated on: 1996-06-21
Original language: en
Available languages: en