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Retention Analysis in Tungsten, Molybdenum, and Graphite Samples Exposed to SOL Plasma in TEXTOR

This study presents simultaneous exposure of tungsten, molybdenum, and graphite samples in the TEXTOR device to SOL plasma. Results show similar retention in all samples, with detailed comparisons and new data points for W samples.

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Retention Analysis in Tungsten, Molybdenum, and Graphite Samples Exposed to SOL Plasma in TEXTOR

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  1. Retention in tungsten, molybdenum and graphite samples simultaneously exposed to SOL plasma in TEXTOR A.Kreter, V.Philipps, S.Droste, M.Freisinger, O.Schmitz and TEXTOR teamInstitut für Energieforschung - Plasmaphysik, Forschungszentrum Jülich, Association EURATOM-FZJ, Trilateral Euregio Cluster, Germany10th ITPA committee meeting on SOL/divertor physics Avila, 7.01.2008

  2. Exposure of roof-like test limiter with stripes Results and comparison with available database Limiter with CFC and graphite 32 reproducible Ohmic discharges in 80% D 177 s total duration Limiter tip at LCFS (0.46 m) neLCFS 1·1019 m-3 ; TeLCFS 45 eV; Ti Te LCFS 2.9·1025 D/m2; SOL()  12 mm Tlim 500 K Similar retention for both CFCs and graphite Similar retention to CFC N11 exposed in PISCES-A

  3. W EK98 W Mo Mo C W DMS780 Mo EK98 DMS780 EK98 NB31 NB31 EK98 Samples with highest fluence analysed by TDS Double roof limiter Exposure of roof-like test limiter with stripes Results of TDS Castellated test limiter in TEXTOR Similar retention in EK98, Mo and W of ~ 1021 D/m2

  4. New TEXTOR W datapoint Comparison with available data PISCES-A, old and new TEXTOR data Lab data by O.Ogorodnikova 200 eV beam, 380-470 K Data fit reasonable with available database

  5. Summary • Graphite, Mo and W samples simultaneously exposed in TEXTOR for fluences of 1.6·1025 D/m2 at T=500 K • Similar retention in the samples of ~ 1021 D/m2

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