Abstract
When helium cooled test blanket modules (TBM) are tested in ITER, the gas composition has to be monitored constantly. In this paper, we present results of measurements performed with a mass spectrometer, while the Helium Loop Karlsruhe (HELOKA) facility was operated at TBM-like conditions (300 °C – 400 °C and 8 MPa). An accuracy of 1 ppmv or lower is reachable with a well calibrated instrument. Measurements are reproducible and can be automated. The measurements showed that the loop filling procedures ensure that the helium stream in HELOKA has a low level of impurities in the range of 0.02 % even after long time operation.
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