Real-time control of total radiated power and assessment of the emissivity distribution with tomography and modeling

HEPP Colloquium

  • Date: Sep 25, 2020
  • Time: 09:00 AM - 09:30 AM (Local Time Germany)
  • Speaker: Philipp Hacker
  • Location: Garching und Greifswald
  • Room: Zoom Meeting
  • Host: HEPP
  • Contact: hepp@ipp.mpg.de
Using the resistive bolometer camera system, which is installed at two ports in the triangular cross-section, the total radiated power can be estimated by projecting the local radiation measurement to the torus volume. During the last experimental campaign the bolometer system has successfully provided such a proxy of the total radiation as a real time signal for feedback controlled plasma operation with a selected radiated power level. It was shown that this feedback control is also possible with a reduced set of bolometer lines of sight and an optimal set of lines of sight for estimation of the total radiated power has been identified.With the help of the 1-D impurity transport code STRAHL we attempted to characterize the spatial radiation loss distribution from the intrinsic carbon and oxygen impurities. The predicted radiation patterns are used to benchmark the tomographic inversion with various surrogate emission distributions. The inversion method is then applied to experimental data from feedback experiments to assess the radiation distribution in W7X and compare to the modeling predictions by STRAHL.
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