Untersuchung der Plasma-Werkstoff-Wechselwirkung unter hohen transienten thermischen Belastungen im Fusionsexperiment TEXTOR und vergleichende Untersuchungen mit einem Elektronenstrahl

Investigation of plasma-material interaction under high transient heat flux in the experimental fusion device TEXTOR and comparative investigations with an electron beam First wall components of future fusion facilities will be subjected to high transient heat loads by incoming hot plasma particles. In this work the investigation of the interaction of various carbon based materials with a hot tokamak plasma and comparative material testing in an electron beam facility are described. Pin shaped material specimen were subjected to the hot edge plasma regions of the TEXTOR tokamak with a pneumatic fast probe device for a duration of 100 ms. For an insertion depth of up to 9 cm into the plasma the calculated heat flux of the undisturbed plasma on the specimen surface reaches 88 kW/cm"2. In addition to the TEXTOR plasma diagnostics for temperature, density in radiation emission the area of the probe tip was observed with a high speed CCD camera in the infrared spectrum and the carbon lineemission was detected with optical emission spectroscopy. A choice of three various types of carbonfibre reinforced graphite was tested. The twodirectional reinforced type CF260 with poor heat conductivity and the three directional reinforced types SEP N11 and NS11 with good heat conductivity. The type NS11 contains 10% silicon. (orig.)Dissertation submitted by K.T. ScholzAvailable from TIB Hannover: RA 831(3314) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman