Analysis of Transmission Characteristics for Single and Double Disk Windows |
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| Authors: | X Yang D Wagner B Piosczyk K Koppenberg E Borie R Heidinger F Leuterer G Dammertz and M Thumm |
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| Institution: | (1) Forschungszentrum Karlsruhe, Association EURATOM-FZK, Institut fuer Hochleistungsimpuls- und Mikrowellentechnik, Kaiserstr. 12, D-76128 Karlsruhe, Germany;(2) Max-Plank-Institut fuer Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany;(3) Institut fuer Hoechstfrequenztechnik and Elektronik, Universitaet Karlsruhe, Kaiserstr. 12, D-76128 Karlsruhe, Germany |
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| Abstract: | The work reports about window design studies for both the JET EP ECRH project and the ASDEX-Upgrade ECRH system. Detailed calculations of the millimeter wave transmission characteristics for conventional single-disk windows, for frequency tunable double-disk windows and for ultra-broadband Brewster windows have been performed. The geometry of the window units has been optimized in order to obtain a suitable transmission characteristic, i.e. power reflection less than –20 dB within a frequency bandwidth of about 1 GHz around the chosen frequencies. In particular the influence of mechanical tolerances on the transmission characteristic has been investigated in order to specify the mechanical dimensions of the CVD-diamond disks and the window unit. In case of a Brewster window, the thickness has been optimized to get low power reflection over a wide angles range around the Brewster angle. |
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| Keywords: | gyrotron CVD-diamond Brewster window broadband transmission characteristic |
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