Efficiency Enhancement of Components Based on Talbot Effect

Денисов, Г. Г.; Fedorova, Ksenia A.; Danilov, Yu. Yu.; Kuzikov, S. V.; Shmelev, M.Yu.

doi:10.1007/s10762-007-9278-9

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…The RSLs will be fed from the main transmission as sketched in Fig.3 (left). As the imaging characteristics of square waveguides diminish at steering angles > 12°, we have started an R&D-programme to optimize RSLs with respect to steering range and beam quality [8,9]. One RSL will employ a square corrugated waveguide with an optimized control of the beam injection at the waveguide entrance.…”

Section: Remote Steering Launcher For Advanced Confinement Studiesmentioning

confidence: 99%

ECRH and W7-X: An intriguing pair

Erckmann¹,

Braune²,

Gantenbein³

et al. 2014

AIP Conference Proceedings

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Abstract. The construction of the W7-X basic machine is almost completed and the device is approaching the commissioning phase. W7-X operation will be supported by ECRH working at 140 GHz in 2 nd harmonic X-or O-mode with 10 MW cw power. Presently the activities at W7-X concentrate on the implementation of wall-armour, in-vessel components and diagnostics. The ECRH-system is in stand by with 5 out of 10 gyrotrons operational. The status of both, the W7-X device and the ECRH system is reported. Further R&D activities concentrate on extending the launching capability for sophisticated confinement investigations with remote steering launchers in a poloidal plane with weak magnetic field gradient.

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Section: Remote Steering Launcher For Advanced Confinement Studiesmentioning

confidence: 99%

ECRH and W7-X: An intriguing pair

Erckmann¹,

Braune²,

Gantenbein³

et al. 2014

AIP Conference Proceedings

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“…For W7-X we have started conceptual design work on improved, CWcompatible, RSLs for the high field side launch. The RSL consists of a basically square corrugated waveguide with cross-section about 50 x 50 mm, however, with some modification to enlarge the steering range [19,20]. The integration between the coupling mirror situated in the main transmission system and the N-port of W7-X requires a mitre bend halfway along the waveguide.…”

Section: Ec-17 Workhopmentioning

confidence: 99%

Large Scale CW ECRH Systems: Some considerations

Erckmann

Kasparek

Plaum

et al. 2012

EPJ Web of Conferences

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Abstract. Electron Cyclotron Resonance Heating (ECRH) is a key component in the heating arsenal for the next step fusion devices like W7-X and ITER. These devices are equipped with superconducting coils and are designed to operate steady state. ECRH must thus operate in CW-mode with a large flexibility to comply with various physics demands such as plasma start-up, heating and current drive, as well as configurationand MHD -control. The request for many different sophisticated applications results in a growing complexity, which is in conflict with the request for high availability, reliability, and maintainability. 'Advanced' ECRH-systems must, therefore, comply with both the complex physics demands and operational robustness and reliability. The W7-X ECRH system is the first CW-facility of an ITER relevant size and is used as a test bed for advanced components. Proposals for future developments are presented together with improvements of gyrotrons, transmission components and launchers.

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“…The problem is that condition (3) is satisfied not well for all propagating modes, especially, for modes which are near the cut off [8]. In particular, the repetition efficiency decreases dramatically in the presence of high-order modes like TE 08 and TE 09 , which are also excited by the incident TE 04 mode.…”

Section: Electron Beam Collector Based On Field Repetition Effectmentioning

confidence: 99%

Efficient Output Mode Converter for 30 GHz Gyroklystron at IAP

Kuzikov

Plotkin

Zaitsev

2009

J Infrared Milli Terahz Waves

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An output mode converter for Ka-band multi-MW gyroklystron in the Institute of Applied Physics (IAP) operating in the TE 53 mode is suggested. Two variants of the converter, aimed for different applications, are presented: the TE 53 to TE 01 mode converter with power output along the device axis and the TE 53 mode to Gaussian wavebeam quasioptical converter with a visor. The suggested designs include the built-in electron beam collector. The converters were designed using a new synthesis algorithm, which implies iterative improvement of the waveguide wall shape in order to achieve high efficiency. The calculation results were proven by HFSS simulation and low-power tests of one version of the converter.

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Efficiency Enhancement of Components Based on Talbot Effect

Cited by 10 publications

References 9 publications

ECRH and W7-X: An intriguing pair

ECRH and W7-X: An intriguing pair

Large Scale CW ECRH Systems: Some considerations

Efficient Output Mode Converter for 30 GHz Gyroklystron at IAP

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