Als Vortrag:

7^th Biennial ECH Transmission Line Workshop, Virginia Beach, Virginia, USA,

Sept. 14 – 16, 2005

Transmission and cooling studies of the torus window
for a remotely steered EC launcher

R. Heidinger^1a, I. Danilov^1a, A. Meier^1a, P. Spaeh^1a, B. Piosczyk^1b, M. Schmid^1b, M. Thumm^1b,2,
W.A. Bongers³ , M. Graswinckel³, B. Lamers³, A.G.A Verhoeven³

Forschungszentrum Karlsruhe, Association EURATOM-FZK,
^1a Institut für Materialforschung I and ^1b Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM),

Postfach 3640, D-76021 Karlsruhe, Germany, ² and Universität Karlsruhe, Institut für Höchstfrequenztechnik und Elektronik

³ FOM Institute for Plasma Physics, Association EURATOM-FOM, Nieuwegein, The Netherlands,

e-mail: roland.heidinger@imf.fzk.de

Abstract

For the ITER remotely steered (RS) EC launcher which is designed by the “ECHULA” team of EURATOM associations to stabilise the Neoclassical Tearing Modes (NTM) at the q=3/2 and q=2/1 surfaces by inducing off-axis current drive, a high performance CVD torus window with edge cooling has been manufactured to allow off-axis transmission of up to 2 MW mm-wave power at 170 GHz. Its performance in a remotely steered beamline (steering range: -12° to 12°) will be discussed based on low power tests performed at FOM Rijnhuizen and on first high power, short pulse tests using the coaxial 170 GHz gyrotron at the Forschungszentrum Karlsruhe. Separate cooling experiments on the CVD diamond window unit and on (electrically heated) copper dummy structures will be reported that demonstrate the compatibility of the window design with the operation parameters of ITER cooling systems.