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An over moded evacuated wave-guide line was chosen to be used in the transmission system for the proposed JET-EP ECRH project. A comparison between the Quasi-Optical, atmospheric wave-guide and evacuated wave-guide was performed for the project with a strong emphasis placed on the technical and financial aspects. The evacuated wave-guide line was chosen as the optimal system in light of the above criteria. The system includes 6 lines of 63.5 mm wave-guide for transmitting the 6.0 MW (10s) at 113.3 GHz frm the gyrotrons to the launching antenna. The lines will be on average 72m in length and consist of 9 miter bends for an estimated transmission efficiency of approximately 90%. Each line will include an evacuated switch leading to a calorimetric load, two DC breaks, two gate valves, one pumpout Tee, a power monitor miter bend and a double disk CVD window near the torus. The location of wave guide supports will be positioned to minimise power converted to higher order modes from wave guide sagging and misalignment. The two gate valves and CVD window will be used as tritium barriers at the torus and between the J1T and J1D buildings. The last leg of the wave-guide leading to the torus will be designed to accommodate for the torus movement during disruptions and thermal cycles. All lines will also be designed to be compatible for the ITER ECRH system operating at 170 GHz.

Additional information

Authors: HENDERSON M A ET AL, Centre de Recherches en Physique des Plasmas, Association EURATOM - Confédération Suisse, École Polytechnique Fédérale de Lausanne (CH);BIRD J, EURATOM-JET, UKAEA, Culham (GB);FLEMMING C, EURATOM-JET, UKAEA, Culham (GB);MacMILLAN G, EURATOM-JET, UKAEA, Culham (GB);DOANE J, General Atomics, San Diego (US);ELZENDOORN B, EEURATOM-FOM Institut voor Plasmafysica 'Rijnhuizen' (NL);VERHOEVEN A G A, EEURATOM-FOM Institut voor Plasmafysica 'Rijnhuizen' (NL);HOEKZEMA F, EURATOM-FZJ, Jülich (DE);PIOSCYK B, EURATOM-FZK, Karlsruhe (DE)
Bibliographic Reference: EPFL Internal report LRP 735/02, December 2002. pp.46.
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747
ISBN: ISSN: 0458-5895
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