Impurity analysis of JET DiMPle pulses

Divertor monitoring pulses (DiMPle) have been run in JET from the C35 campaign onwards. They provide an opportunity to study impurity contamination of plasma when it is limited by different surfaces within machine, as well longer term behaviour impurities. In these discharges first on outer wall, then inner wall and, subsequently, X-point configuration strike point positioned horizontal tile 5 machine followed 6 and vertical 7. The present details DiMPle JET-ILW campaigns C38, which ran 2015 2019. impurities can largely be divided into two groups. first, including most gases, are immediately after their use machine; second group includes those elements that retained facing vessel. Most metals, for a systematic found. Influxes due metallic dust particles behave more like group. origin where this known given behaviour, differences line-of-sight observing spectrometer. A clear difference seen discharge fuel H has implications tritium deuterium-tritium operations.