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A 12 channel bolometer camera based on a gold foil absorber has been installed on the WEGA stellarator to measure the radiation power losses of the plasma. The measured total radiation power is typically less than 30% of the ECRH input power. However, this radiated power fraction depends on the ECRH input power, the magnetic configuration and the field strength as well as the working gas. For separatrix‐bounded configurations, core‐peaked radiation intensity profiles are usually detected, while in a limiter‐configuration they are flatter, broader and more asymmetric. In addition, significant radiation originating from the SOL region is measured for all the cases studied. The SOL radiation changes with changing the plasma‐wave interaction region, indicating a strong correlation between radiation and power deposition. Under the WEGA‐plasma conditions (Te<10 eV), it is considered that the radiation profile reflects the plasma pressure associated with the power deposition distribution of the ECRH.

Bolometer Results in the Long-Microwave-Heated WEGA Stellarator