Design of the evacuated waveguide transmission lines for JET-EP ECRH project
An over-moded evacuated waveguide line was chosen for use in the transmission system for the proposed JET-EP ECRH project. The system includes 6 lines of 63.5mm corrugated waveguide for transmitting the 6.0MW (10s) at 113.3GHz from the gyrotrons to the launching antenna in the fundamental HE11 mode. The lines will be on average 72m in length and include 9 miter bends for an estimated transmission efficiency of 91%. 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 waveguide supports will be positioned to minimize power converted to higher order modes from waveguide sagging and misalignment. The two gate valves and double disk CVD window will be used as tritium barriers at the torus and between J1T and J1D. The last leg of the waveguide leading to the torus will be designed to accommodate the torus movement during disruptions and thermal cycles. All lines will also be designed to be compatible for 170GHz operation (permits potential operation of ITER gyrotrons on JET-EP and reuse of the waveguide lines on ITER). A brief description of the lines and discussion of the above topics will be presented.
Bibliographic Reference: An oral report given at: 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating Organised by: Association Euratom-CEA, Cadarache Held at: Aix-en-Provence (FR) May 13-16, 2002
Availability: Workshop papers are available online at: http://wshop.free.fr/ec12/ This paper is also published in report LRP 726/02, available free of charge from: École Polytechnique Fédérale de Lausanne, Ecublens, CH-1015 Lausanne Fax +41-21-693474
Record Number: 200215132 / Last updated on: 2002-08-07
Original language: en
Available languages: en