Abstract
Ammonia injection in the afterglow region of the divertor plasma has been proposed for the inhibition of tritium/carbon co-deposits in remote areas of ITER when operated with carbon-based divertor targets. Supporting experiments in the PILOT-PSI divertor simulator plasma device and in a RF methane plasma were presented in the last PSI Conference. In this work we address the effect of ammonia injection in TEXTOR, a limiter tokamak. Mixtures of hydrogenated methane and ammonia were puffed into D plasmas at the Quartz MicroBalance (QMB) location, a lock limiter 7 cm away from the LCFS. The scavenger effect and erosion of the growing or pre-existing films could play a similar role in the observed behavior. In both mechanisms, eroded carbon is mostly converted into HCN. The observed strong erosion opens up the possibility of controlling T inventory in the plasma-exposed surfaces by direct ammonia seeding in ITER plasmas, implying water-free conditions.
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