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

• Published in: 2018 11th German Microwave Conference (GeMiC) pp. 287 - 290
• Main Authors: Kalaria, P. C., Avramidis, K. A., Gantenbein, G., Illy, S., Pagonakis, I. Gr, Thumm, M., Jelonnek, J.
• Format: Conference Proceeding
• Language: English
• Published: IMA 01.03.2018
• Subjects: Cavity resonators; DEMO; ECRH; Eigenvalues and eigenfunctions; electron cyclotron resonance heating; Electron guns; gyrotron; Gyrotrons; Heating systems; high order modes; mode competition control; Nuclear fusion; plasma heating; Power generation; triode-type start-up; Weapons
• DOI: 10.23919/GEMIC.2018.8335086

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 cut-off frequency of236 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.