Abstract
The release of deuterium and impurity atoms from a W test limiter exposed to the edge plasma of TEXTOR is studied both experimentally and by means of Monte Carlo simulations. Experimentally, spatial intensity distributions of D γ, CII, OII and WI line spectra emission are observed around the limiter, whereas the particle release from the limiter is simulated combining the TRIDYN model with a transport model of released particles in the plasma. Good agreement is found in spatial distributions between experimentally observed WI line intensity and simulated ionization events of physically sputtered W atoms. The observed D γ line emission is attributed to the re-emission of very low-energy (∼ 0.1 eV) D atoms, the energy of which depends on the limiter temperature. Low-energy C and O atoms are also observed probably due to chemical sputtering or surface reaction of implanted (deposited) impurities producing hydrocarbons and volatile oxides. The observed CII and OII line emissions at a distance more than about 1 cm from the limiter surface are influenced by the physical sputtering of impurities deposited from the background plasma on the W limiter.
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