EU Megawatt-Class 140-GHz CW Gyrotron

Thumm, M.; Alberti, S.; Arnold, A.; Brand, Peter; Braune, H.; Dammertz, G.; Erckmann, V.; Gantenbein, G.; Giguet, E.; Heidinger, R.; Hogge, J.‐P.; Illy, S.; Kasparek, W.; Laqua, H. P.; Legrand, François; Leonhardt, W.; LievinLievin, C.; Michel, G.; Neffe, G.; Piosczyk, B.; Schmid, Martin; Schwörer, K.; Tran, M.Q.

doi:10.1109/tps.2007.892144

Cited by 78 publications

(56 citation statements)

References 19 publications

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“…The stray radiation (typically less than 5 %, for the TED Gyrotron SNo.1 about 3 % [9]) is emitted through the window under arbitrary angles and has to be dumped by water-cooled absorbers and the concrete walls of the beam duct, see Sec. II.A.…”

Section: The Transmission System: Characteristics and Lossesmentioning

confidence: 99%

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ECRH for W7-X: Transmission Losses of High-Power 140-GHz Wave Beams

Erckmann

Kasparek

Gantenbein

et al. 2009

Fusion Science and Technology

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Section: The Transmission System: Characteristics and Lossesmentioning

confidence: 99%

“…The losses depend on the gyrotron beam-quality and are somewhat different for each gyrotron. The worst-case losses are 5 % for the W7-X gyrotrons and the related MOU [9]. As this is a significant loss channel, there is still some benefit in improving the gyrotron output beam quality further.…”

Section: The Transmission System: Characteristics and Lossesmentioning

confidence: 99%

ECRH for W7-X: Transmission Losses of High-Power 140-GHz Wave Beams

Erckmann

Kasparek

Gantenbein

et al. 2009

Fusion Science and Technology

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“…The gyrotron design is essentially based on modifications of the W7-X gyrotron [6][7][8] in which some sub-components have been redesigned (see Fig. 3 [9]) using the most advanced models.…”

Section: Dual-frequency Gyrotronmentioning

confidence: 99%

Recent progress in the upgrade of the TCV EC-system with two 1MW/2s dual-frequency (84/126GHz) gyrotrons

et al. 2017

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Abstract. The upgrade of the EC-system of the TCV tokamak has entered in its realization phase and is part of a broader upgrade of TCV. The MW-class dual-frequency gyrotrons (84 or 126GHz/2s/1MW) are presently being manufactured by Thales Electron Devices with the first gyrotron foreseen to be delivered at SPC by the end of 2017. In parallel to the gyrotron development, for extending the level of operational flexibility of the TCV EC-system the integration of the dual-frequency gyrotrons adds a significant complexity in the evacuated 63.5mm-diameter HE 11 transmission line system connected to the various TCV low-field side and top launchers. As discussed in [1], an important part of the present TCV-upgrade consists in inserting a modular closed divertor chamber. This will have an impact on the X3 top-launcher which will have to be reduced in size. For using the new compact launcher we are considering employing a Fast Directional Switch (FADIS), combining the two 1MW/126GHz/2s rf-beams into a single 2MW rf-beam.

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“…manufactured by Thales Electron Devices [8] were fed to the diplexer. These gyrotrons have a potential depressed collector; their acceleration voltage and thus the output power are controlled by a fast HV modulator [9].…”

Section: Iia Diplexer Design and Installationmentioning

confidence: 99%

Power Combination of Two 140-GHz Gyrotrons and Fast Switching of the Combined Beam

Erckmann

Kasparek

Koshurinov

et al. 2009

Fusion Science and Technology

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Experiments on the combination of the high power wave beams from two gyrotrons and fast switching of the combined beam between two transmission channels are described. The measurements were performed using a high-power resonator diplexer in the optical transmission line of the electron cyclotron heating system for W7-X. The principle and the engineering design of the prototype fourport quasi-optical diplexer is presented. The wave beams from two gyrotrons with an output power of 370 kW and 560 kW, respectively, have been combined for pulse lengths up to 10 seconds, only limited by the un-cooled mirrors used in the diplexer. By modulating the gyrotron frequency using a fast high-voltage body modulator, controlled toggling of the combined power between the two outputs of the diplexer was demonstrated with switching frequencies of up to 20 kHz.The experiments are compared to theory, showing good agreement when the limited stability of the free-running gyrotrons is taken into account.

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EU Megawatt-Class 140-GHz CW Gyrotron

Cited by 78 publications

References 19 publications

ECRH for W7-X: Transmission Losses of High-Power 140-GHz Wave Beams

ECRH for W7-X: Transmission Losses of High-Power 140-GHz Wave Beams

Recent progress in the upgrade of the TCV EC-system with two 1MW/2s dual-frequency (84/126GHz) gyrotrons

Power Combination of Two 140-GHz Gyrotrons and Fast Switching of the Combined Beam

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