Development of a 140-ghz 1-mw continuous wave gyrotron for the w7-x stellarator

Abstract:The W 7-X Stellarator (R = 5.5 m, a = 0.55 m, B<3.0 T), which is presently being built at IPP-Greifswald, aims at demonstrating the inherent steady state capability of stellarators at reactor relevant plasma parameters. A 10 MW ECRH plant with cwcapability is under construction to meet the scientific objectives. The physics background of the different heating-and current drive scenarios is presented. The

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“…Results from the two R&D tubes from TED are reported in [22], results from the R&D at CPI are reported in [23,24,25], respectively.…”

Section: Iiia the W7-x Gyrotronmentioning

confidence: 99%

Electron Cyclotron Heating for W7-X: Physics and Technology

Erckmann

Brand

Braune

et al. 2007

Fusion Science and Technology

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“…Full performance operation at >0.9 MW for 30 min was demonstrated with gyrotrons from both companies [4,5]. As the gyrotron diamond window has a resonant thickness of 4λ/2 at 140 GHz, it is also transparent at 105 GHz corresponding to 3λ/2.…”

Section: Two Frequency Operationmentioning

confidence: 99%

The W7-X ECRH Plant: Recent Achievements

Erckmann

Brand²,

Braune

et al. 2007

AIP Conference Proceedings

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Abstract. The 10 MW, 140 GHz, CW ECRH-plant for W 7-X is in an advanced state of commissioning and the installation was used to investigate advanced applications for extended heating-and current drive scenarios. The operation of the TED gyrotrons was recently extended to a 2 nd frequency of 103.6 GHz at reduced output power and first results are presented. An improved collector sweep system for the W7-X gyrotrons with enhanced power capability and smooth power distribution was developed, results are reported.

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“…A Gaussian beam is produced by a gyrotron at 140 GHz. This gyrotron is capable of delivering a power of up to 1 MW at a pulse length of up to 5 s and 470 kW at a pulse length of up to 180 s [7]. The transmission path from the gyrotron to the waveguide is given in Fig.…”

Section: Experimental Set-upmentioning

confidence: 99%