Interaction circuit design and RF behavior of a 236 GHz gyrotron for DEMO

Kalaria, P.; Avramidis, K.; Franck, J.; Gantenbein, G.; Illy, S.; Pagonakis, I.; Thumm, M.; Jelonnek, John

doi:10.1109/gemic.2015.7107804

Cited by 8 publications

(1 citation statement)

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“…The minimum required output power for the hollow-cavity design is set above 1 MW, which shall be further extended to 2 MW. Systematic design studies of the hollow-cavity and coaxial-cavity DEMO gyrotrons have been presented in [7][8] and [9][10], respectively. For the hollow-cavity design, the results suggest stable excitation of the TE-43,15 mode (eigenvalue ~ 103) with an output power of 920 kW.…”

Section: Introductionmentioning

confidence: 99%

Mode competition control using triode-type start-up scenario for a 236 GHz gyrotron for DEMO

Kalaria

Avramidis

Gantenbein

et al. 2018

2018 11th German Microwave Conference (GeMiC)

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After ITER, the first real prototype of a fusion power plant is foreseen. It is named Demonstration Power Plant (DEMO). Within the EUROfusion work package "Heating and Current Drive", the conceptual designs of both a hollow-cavity and coaxial-cavity gyrotron for DEMO has been suggested. For DEMO, the major target is to achieve an output power per tube which is significantly larger than 1 MW CW at an operating frequency of up to 240 GHz. In the case of the hollow-cavity gyrotron design, a very high-order TE mode (eigenvalue > 103 at a cutoff frequency of 236 GHz) is the prerequisite for the targeted high output power. At this eigenvalue range, the excitation of the desired operating mode during gyrotron start-up becomes challenging due to a large number of competing modes. In this work, it is demonstrated by numerical simulation that mode excitation and mode competition control can be significantly facilitated by using special start-up scenarios, based on a triode electron gun.

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Section: Introductionmentioning

confidence: 99%