An over-moded evacuated waveguide line was chosen for use in the transmission system for the proposed JET enhanced performance project (JET-EP) electron cyclotron resonance heating (ECRH) system. A comparison between the quasi-optical, atmospheric waveguide and evacuated waveguide systems was performed for the project with a strong emphasis placed on the technical and financial aspects. The evacuated waveguide line was chosen as the optimal system in light of the above criteria. The system includes six lines of 63.5 mm waveguide for transmitting 6.0 MW(10 s) at 113.3 GHz from the gyrotrons to the launching antenna. The designed lines are on average 72 m in length and consist of nine mitre bends, for an estimated transmission efficiency of similar to90%. Each line is designed to include an evacuated switch leading to a calorimetric load, two do breaks, two gate valves, one pumpout tee, a power monitor mitre bend and a double-disc CVD window near the torus. The location of waveguide support is positioned to minimize the power converted to higher-order modes from waveguide sagging and misalignment. The two gate valves and CVD window are designed to be used as tritium barriers at the tot-us and between the J1T and J1D buildings. The last leg of the waveguide leading to the torus has to be designed to accommodate the torus movement during disruptions and thermal cycles. All lines are also designed to be compatible with the ITER ECRH system operating at 170 GHz.

/pdf/an-iter-relevant-evacuated-waveguide-transmission-system-for-3laq6ga1x1.pdf

An ITER-relevant evacuated waveguide transmission system for the JET-EP ECRH project

Conceptual study of ECH/ECCD system for fusion DEMO plant

Vacuum electron devices (VEDs) are the most powerful and efficient sources of coherent radiation throughout the microwave and millimeter wave bands. Traditional applications of powerful VEDs are in such areas as defense, radar, communications, or industrial heating. This presentation will review prospects for new applications in scientific research, especially in large scale applications, sometimes referred to as " Big Science. " Opportunities are promising in at least three fields: plasma heating in the program of nuclear fusion energy research; particle acceleration; and Terahertz technology.

Vacuum Electron Devices for Applications in " Big Science"

A prototype of a 1 MW, CW, 140 GHz conventional gyrotron for the W7-X stellarator in Greifswald/Germany has been tested successfully and the fabrication of series tubes started. In extended studies the feasibility for manufacturing a continuously operated high power coaxial cavity gyrotron has been demonstrated and all needed data for an industrial design has been obtained. Based on this results the fabrication of a first prototype of a 2 MW, CW, 170 GHz coaxial cavity gyrotron started recently in cooperation between European research institutions and European tube industry. The prototype tube is foreseen to be tested in 2006 at CRPP Lausanne where a suitable test facility is under construction.

Development of steady-state 2 MW, 170 GHz gyrotrons for ITER

Experimental results of the 140 GHz, 1 MW longpurse gyrotron for W7-X

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Development of steady-state 2 MW, 170 GHz gyrotrons for ITER

Experimental results of the 140 GHz, 1 MW longpurse gyrotron for W7-X