Conceptual study of ECH/ECCD system for fusion DEMO plant

A systematic theoretical and experimental study on 94-GHz second-harmonic gyrotron with a superconducting magnet system is presented in this paper. A complex cavity with gradual transition is employed in the gyrotron. A self-consistent field nonlinear theory is used and numerical simulation results for electron beam interaction with TE02–TE03 modes are given. A pulse output power of 235.2 kW is obtained by simulation at a beam voltage of 60 kV with beam current of 10 A and magnetic field 17 kG, corresponding to an efficiency of 39.2 %.

Design and Experimental Demonstration of a 94-GHz Gyrotron with Complex Cavity Operating at the Second Harmonic

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

European Development of a Gyrotron for ITER: Design and Analysis, and Support to the Industrial Contracts

Manfred THUMM1,2), Peter BRAND4), Harald BRAUNE3), Gunter DAMMERTZ1), Volker ERCKMANN3), Gerd GANTENBEIN1), Stefan ILLY1), Walter KASPAREK4), Stefan KERN1), Heinrich P. LAQUA3), Carsten LECHTE4), Wolfgang LEONHARDT1), Nikolai B. MARUSHCHENKO3), Georg MICHEL3), Bernhard PIOSCZYK1), Martin SCHMID1), Yuri TURKIN3) and Michael WEISSGERBER3) 1)Forschungszentrum Karlsruhe, Association EURATOM-FZK, Institut fur Hochleistungsimpulsund Mikrowellentechnik (IHM), D-76021 Karlsruhe, Germany 2)Universitat Karlsruhe, Institut fur Hochfrequenztechnik und Elektronik (IHE), D-76131 Karlsruhe, Germany 3)Max-Planck-Institut fur Plasmaphysik (IPP), EURATOM Association, Teilinstitut Greifswald D-17491 Greifswald, Germany 4)Universitat Stuttgart, Institut fur Plasmaforschung (IPF), D-70569 Stuttgart, Germany (Received 9 January 2009 / Accepted 11 May 2009)

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Status and high power performance of the 10-MW 140-GHz ECH system for the stellarator W7-X

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

European Development of a Gyrotron for ITER: Design and Analysis, and Support to the Industrial Contracts

Status and high power performance of the 10-MW 140-GHz ECH system for the stellarator W7-X