Radiation Profiles Measured With Imaging Bolometers on LHD During Plasma Detachment and Their Comparison With Synthetic Images

The infrared imaging video bolometer (IRVB) is used for measuring radiation profiles from the large helical device (LHD) helical plasma in 2-D. Currently, the images from the IRVB are used to study the radiation localization during plasma detachment using multiple IRVB modules installed at strategic port locations on LHD. The experimental results from the IRVBs are compared with the modeled radiation from the EMC3-EIRENE impurity transport code, by tracing the sightlines through the code results in 3-D using a synthetic instrument. A correlation can thus be established and measures for convergence between the experiment and model results can then be attempted.