Abstract
A recent series of experiments on TEXTOR offered a unique opportunity to measure the effects of changing wall conditions (surface impurities, temperature, and pretreatment) on plasma parameters, impurities, and hydrogen recycling. The TEXTOR liner is Inconel 625. The liner was baked to 150 or 300°C. It was cleaned by (1) a radio-frequency supported glow discharge (RG) or (2) an electron cyclotron resonant (ECR) plasma. Methane was added to the RG discharge, for one experiment, to increase the carbon concentration and lower the oxygen levels on the wall. Changing wall surface compositions caused the optical light intensities from the major plasma impurities, carbon, and oxygen, to vary by a factor of 2 to 5 and hydrogen recycle coefficients to vary by more than an order of magnitude. Except during dirty wall conditions and during the carbon addition experiments, changes in plasma density and current, electron temperature and energy confinement times were relatively small.
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