The Euratom association FOM-Rijnhuizen is developing a plug-in 170 GHz ECW launcher system for use in the upper-ports of ITER, based on the remote steering (RS) principle, designed to stabilise the neoclassical tearing modes (NTM) at the q=3/2 and q=2/1 surfaces by inducing off-axis current drive. The launching system enables up to eight mm-wave beams per port plug to be directed from the feeding waveguides through corrugated square waveguides (/spl ap/ 44/spl times/44 mm/sup 2/) inside the port plug to the plasma. A mock-up system has been manufactured, capable of vacuum & high-power short-pulse operation. The transmission line consists of a taper, to launch an HE/sub 11/ mode in 63.5 mm circular corrugated waveguide. (The taper will be replaced by a gyrotron source in high power testing). The circular waveguide is used as input for the steering mechanism, housed in a vacuum vessel, which directs the beam under an angle between -12/spl deg/ and 12/spl deg/ through the CVD diamond window into the copper square corrugated waveguide. Antenna patterns from the exit aperture of the square waveguide are scanned using a 3-axis scanner. Low-power measurements (Takahashi et al., 2003) are a preparatory phase for high-power tests, currently prepared in FZK. In the low-power measurements, waveguide performance will be inferred from antenna pattern measurements. Of interest are slight differences in beam parameters (angle, waist etc.) relative to the input beam.


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    Titel :

    Low- and high-power measurements on a remote steering upper port launcher mockup for ITER


    Beteiligte:
    Bongers, W.A. (Autor:in) / Graswinckel, M.F. (Autor:in) / Fernandez, A. (Autor:in) / Bruschi, A. (Autor:in) / Elzendoorn, B.S.Q. (Autor:in) / Heidinger, R. (Autor:in) / Schwoerer, K. (Autor:in) / Kruyt, O.G. (Autor:in) / Lamers, B. (Autor:in) / Lammerts, R. (Autor:in)


    Erscheinungsdatum :

    2005-01-01


    Format / Umfang :

    2162947 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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