An Inverse Magnetron Injection Gun for the KIT 2-MW Coaxial-Cavity Gyrotron

Ruess, S.; Pagonakis, I.; Gantenbein, G.; Illy, S.; Kobarg, T.; Rzesnicki, T.; Thumm, M.; Weggen, J.; Jelonnek, John

doi:10.1109/ted.2016.2540298

Cited by 35 publications

(25 citation statements)

References 16 publications

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“…The proposed design of the IMIG [1] matches the design and the nominal operating parameters of the European 170-GHz, 2-MW coaxial-cavity gyrotron, originally intended for the first installation at ITER [2]. The IMIG can also be operated in the KIT 2-MW coaxial longer-pulse gyrotron [5], as well as in conventional gyrotrons [6] and is compatible with future fusion gyrotrons at 204 GHz and multi-MW output power range.…”

Section: Introduction To the Advanced Imigmentioning

confidence: 85%

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Design and manufacturing process for the KIT 2-MW 170-GHz coaxial-cavity longer-pulse gyrotron

et al. 2017

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Today's performance requirements for future DEMO gyrotrons are an operating frequency between 170 GHz up to 240 GHz and an output power of significantly larger than 1 MW (today's target: 2 MW). A total gyrotron efficiency of better than 60 % must be achieved. Multipurpose/multi-frequency operation and frequency steptunability are required also. It has been shown earlier, that the coaxial-cavity technology is a promising candidate [1]. In [2] a world record RF output power of 2.2 MW has been reported for short-pulses (in the range of few milliseconds). Nevertheless, it has to be proven that the coaxial-cavity technology can be used for long-pulse operation. That shall be achieved by upgrading the existing 2 MW 170 GHz short-pulse prototype used for the demonstration of the 2.2 MW record power. Additionally, a new Inverse Magnetron Injection Gun (IMIG) shall allow a significant larger emitter radius and therefore increased output power at operating frequencies significantly above 200 GHz by keeping the same or even smaller diameter of the warm bore hole of the superconducting gyrotron magnet. Both, the IMIG as well as the longer pulse gyrotron will show the way towards higher output power at higher operating frequencies of gyrotrons together with a more robust design and construction of that kind of tubes.

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Section: Introduction To the Advanced Imigmentioning

confidence: 85%

“…The corresponding simulation results were already presented in [5]. In order to verify the thermomechanical simulation results a measurement setup was designed and manufactured.…”

Section: Experimental Measurementsmentioning

confidence: 99%

Design and manufacturing process for the KIT 2-MW 170-GHz coaxial-cavity longer-pulse gyrotron

et al. 2017

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“…Additionally, the IMIG is the first MIG which fulfils the design criteria for preventing the generation of trapped electrons as presented in [17]. The generation of a beam halo is suppressed by the use of two halo shields [15]. Based on its triode configuration, the presented IMIG can be modified and operated in a conventional hollow gyrotrons easily [18].…”

Section: Advanced Migmentioning

confidence: 99%

KIT coaxial gyrotron development: from ITER toward DEMO

Ruess

Avramidis

Fuchs

et al. 2018

Int. J. Microw. Wireless Technol.

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Karlsruhe Institute of Technology (KIT) is doing research and development in the field of megawatt-class radio frequency (RF) sources (gyrotrons) for the Electron Cyclotron Resonance Heating (ECRH) systems of the International Thermonuclear Experimental Reactor (ITER) and the DEMOnstration Fusion Power Plant that will follow ITER. In the focus is the development and verification of the European coaxial-cavity gyrotron technology which shall lead to gyrotrons operating at an RF output power significantly larger than 1 MW CW and at an operating frequency above 200 GHz. A major step into that direction is the final verification of the European 170 GHz 2 MW coaxial-cavity pre-prototype at longer pulses up to 1 s. It bases on the upgrade of an already existing highly modular short-pulse (ms-range) pre-prototype. That pre-prototype has shown a world record output power of 2.2 MW already. This paper summarizes briefly the already achieved experimental results using the short-pulse pre-prototype and discusses in detail the design and manufacturing process of the upgrade of the pre-prototype toward longer pulses up to 1 s.

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“…The generation of secondary electrons in non-emitter regions from bombardment with trapped particles has been minimised. Additionally, an advanced type of emitter ring [3] is used in order to minimize the sensitivity of the manufacturing and alignement tolerances of the emitter and its neighbouring parts on the gyrotron performance In parallel, an innovative Inverse Magnetron Injection Gun (IMIG) has been designed at KIT for the modular 2 MW, 170 GHz coaxial-cavity pre-prototype gyrotron [4]. The design allows the implementation of a significant larger emitter ring compared to the conventional MIG, considering the same radial tube dimensions.…”

Section: Mw Coaxial Cavity Gyrotron Developmentmentioning

confidence: 99%

Recent Trends in Fusion Gyrotron Development at KIT

et al. 2017

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Abstract. ECRH&CD is one of the favorite heating system for magnetically confined nuclear fusion plasmas. KIT is strongly involved in the development of high power gyrotrons for use in ECRH systems for nuclear fusion. KIT is upgrading the sub-components of the existing 2 MW, 170 GHz coaxial-cavity short-pulse gyrotron to support long-pulse operation up to 1 s, all components will be equipped with a specific active cooling system. Two important developments for future high power, highly efficient gyrotrons will be discussed: design of gyrotrons with high operating frequency (~ 240 GHz) and efficiency enhancement by using advanced collector designs with multi-staged voltage depression.

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An Inverse Magnetron Injection Gun for the KIT 2-MW Coaxial-Cavity Gyrotron

Cited by 35 publications

References 16 publications

Design and manufacturing process for the KIT 2-MW 170-GHz coaxial-cavity longer-pulse gyrotron

Design and manufacturing process for the KIT 2-MW 170-GHz coaxial-cavity longer-pulse gyrotron

KIT coaxial gyrotron development: from ITER toward DEMO

Recent Trends in Fusion Gyrotron Development at KIT

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