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Exposure of roof-like test limiter with stripes

Retention in tungsten, molybdenum and graphite samples simultaneously exposed to SOL plasma in TEXTOR.

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Exposure of roof-like test limiter with stripes

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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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