Abstract
The internal configuration of the TEXTOR tokamak at Kernforschungsanlage (KFA) Jülich, Federal Republic of Germany, has been modified recently to include antennas for Ion Cyclotron Resonance Heating (ICRH) of the plasma. Passive deposition probe measurements of edge impurity fluxes were made for typical Ohmic discharges with this new liner configuration. The time-resolved behavior of impurities in the edge was determined as a function of radius and limiter position using rotating probe techniques. The dominant metallic impurities were found to be iron and the other components of stainless steel. Average deposited iron fluxes circulating along the field lines were found to be ∼1015/cm2 s at 5 cm behind the limiter radius. Radial profiles of the principal metallic impurities demonstrate a characteristic decrease with increasing radius outside the limiters and show an e-folding length of ∼1.9 cm. The limiting effects of the rf antenna are also evident in the radial profiles. Present results are compared with previous measurements of edge fluxes made prior to the modifications to the plasma-side liner of TEXTOR.
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