Abstract
Edge structures in fusion devices are bombarded simultaneously by plasma species which include hydrogenic ions, neutrals, electrons, photons, etc., raising the possibility of synergistic effects. Such a synergistic effect has recently been invoked to explain the very extensive erosion observed on a graphite probe cap exposed to RF-heated plasmas in PLT. Under controlled laboratory experiments we have observed a strong synergistic effect for CH4 production resulting from combined H+ ion and H0 atom impact on pyrolytic graphite. We hypothesize that the observed synergism is caused by ion-induced damage of the graphite, leading to an increase in carbon reactivity for subsequent methane formation by sub-eV H0 atoms. Similar levels of enhancement in methane production were found for simultaneous and sequential bombardment by H+ ions and H0 atoms.
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